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Patrick T.

Physics 101 Mechanics

2 years, 4 months ago

What is the average airspeed of a jet?

AL

Alex L.

Physics 101 Mechanics

2 years, 4 months ago

How to do this problem?

LB

Linda B.

Physics 101 Mechanics

2 years, 4 months ago

A rock is dropped from a 10m high ledge a)what is the speed when it hits the ground? b)What is the height when its speed is half the value found in part a?

Jake S.

Physics 101 Mechanics

2 years, 4 months ago

What is the gravitational force on the moon?

SB

Sierra B.

Physics 101 Mechanics

2 years, 4 months ago

how much objects resist being set into motion

EL

Ellen L.

Physics 101 Mechanics

2 years, 4 months ago

how much heat does it take to increase the temperature of 1 mol of a diatomic ideal gas by 1 C? 20.79J

MD

Melissa D.

Physics 101 Mechanics

2 years, 4 months ago

All other things being equal, what happens to the drift speed in wires made of metal having a larger number of conduction electrons per atom than copper? Explain.

SR

Sophia R.

Physics 101 Mechanics

2 years, 4 months ago

a small first aid kit is dropped by a rock climber who is descending steadily at 1.3m/s

SR

Sophia R.

Physics 101 Mechanics

2 years, 4 months ago

a ranger in a national park is driving at 56km/h when a deer jumps onto the road 65m ahead

SR

Sophia R.

Physics 101 Mechanics

2 years, 4 months ago

a ranger in a national park is driving at 56km/h when a deer jumps onto the road 65m ahead

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

7. A 1 200-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9 000-kg truck moving in the same direction at 20.0 m/s. The velocity of the car right after the collision is 18.0 m/s to the east. What is the velocity of the truck right after the collision?

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

8. A pitcher throws a 0.15-kg baseball so that it crosses home plate horizontally with a speed of 20 m/s. The ball is hit straight back at the pitcher with a final speed of 22 m/s. (a) What is the impulse delivered to the ball? (b) Find the force exerted by the bat on the ball if the two are in contact for 2.0 × 10–3 s.

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

9. The angular velocity of a car wheel changes from 4 rad/s to 20 rad/s in 25 s. if the wheel has a radius of 350 mm, what is a) The angular acceleration of the wheel? b) The tangential linear acceleration of a point on the rim of the wheel?

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

10. For safety in climbing, a mountaineer uses a nylon rope that is 50 m long and 1.0 cm in diameter. When supporting a 90-kg climber, the rope elongates 1.6 m. Find its Young’s modulus.

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

The angular velocity of a car wheel changes from 4 rad/s to 20 rad/s in 25 s. if the wheel has a radius of 350 mm, what is The angular acceleration of the wheel?

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

The angular velocity of a car wheel changes from 4 rad/s to 20 rad/s in 25 s. if the wheel has a radius of 350 mm, what is The tangential linear acceleration of a point on the rim of the wheel?

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

An object of mass 0.3 kg is hung on a rope of length 1.5 m. It then making a horizontal circular motion at a constant speed of 6 m/s. (a) Determine its acceleration. (b) Find the tension in the rope.

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

An object of mass 0.3 kg is hung on a rope of length 1.5 m. It then making a horizontal circular motion at a constant speed of 6 m/s. (a) Determine its acceleration. (b) Find the tension in the rope.

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

An object of mass 0.3 kg is hung on a rope of length 1.5 m. It then making a horizontal circular motion at a constant speed of 6 m/s. (a) Determine its acceleration. (b) Find the tension in the rope.

JH

Jay H.

Physics 101 Mechanics

2 years, 4 months ago

The units of the chain system of measure used by surveyors are 7.92 in = 1 link, 100 links or 66 ft = 1 chain, 10 chains = 1 furlong, 80 chains = 1 mi. A length of 3.8 furlongs is equal to (a) ___ chains, (b) ___ links, and (c) ___ miles.

Patrick T.

Physics 101 Mechanics

2 years, 4 months ago

What is the speed of sound?

ka

Karen A.

Physics 101 Mechanics

2 years, 4 months ago

A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 ? 10?4°C?1). At room temperature (20.0°C), the frames have circular lens holes 2.39 cm in radius. To what temperature must the frames be heated if lenses 2.4 cm in radius are to be inserted into them?

ka

Karen A.

Physics 101 Mechanics

2 years, 4 months ago

A rod with a length of 1.4 m is made of brass, which has a coefficient of linear expansion of 1.90 ? 10?5 (°C)?1. It is initially at a temperature of 30°C. (a) What is the change in length of the rod if the temperature drops to 0.0°C? (Give the absolute value in units of mm.) (b) How does the rod's length change with lower temperature? (c) Find the absolute value of the fraction by which the rod's length changes between the two temperatures.

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

A car is driven 215 km west and then 85 km southwest. What is the displacement of the car from the point of origin ?

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

Show that the vector labeled "incorrect" in FIg. 3-6c is actually the difference of the two vectors.

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

Graphically determine the resultant of the following three vector displacements

GS

Garrett S.

Physics 101 Mechanics

2 years, 4 months ago

Derive the Law of Reflection, ?i = ?r (theta sub i and theta sub r), by using the calculus to minimize the transit time, as required by Fermat's Principle. [From "Optics" by Eugene Hecht, fifth edition]

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

Graphically determine the resultant of the following three vector displacements: (1) 34m, 25 north of east; (2) 48m, 33 east of north; and (3) 22m, 56 west of south

GS

Garrett S.

Physics 101 Mechanics

2 years, 4 months ago

Show that the two rays that enter the system in Fig. P.4.39 parallel to each other emerge from it being parallel.

GS

Garrett S.

Physics 101 Mechanics

2 years, 4 months ago

Show that, in the paraxial domain, the magnification produced by a single spherical interface between two continuous media, as shown in Fig. P.5.6, is given by ... Use the small-angle approximation for Snell's Law and approximate the angles by their tangents. [From "Optics" by Eugene Hecht, fifth edition]

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

V is a vector 14.3 units in magnitude and points at an angle of 34.8 above the negative x axis.

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

V is a vector 14.3 units in magnitude and points at an angle of 34.8 above the negative x axis.

GS

Garrett S.

Physics 101 Mechanics

2 years, 4 months ago

Imagine a hemispherical interface, with a radius of curvature of radius 5.00cm, separating two media: air on the left, water on the right. A 3.00-cm-tall toad is on the central axis, in air, facing the convex interface and 30.0 cm from its vertex. Where in the water will it be imaged? How big will it appear to a fish in the water? Use the results of the previous problem [5.6], even though our frog is pushing the paraxial approximation. [ From "Optics" by Eugene Hecht, fifth edition]

GS

Garrett S.

Physics 101 Mechanics

2 years, 4 months ago

Return to problem 5.7 and suppose we cut off the medium on the right, forming a thick water biconvex lens, with each surface having a radius of curvature of 5.00 cm. If the lens is 10.0 cm thick, determine the total magnification and everything you can about the toad's image. [from "Optics" by Eugene Hecht, fifth edition]

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

An airplane is traveling 735 km/hr in a direction 41.5 west of north

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

Determine the vector A-C, given the vectors A and AC in Fig 3-32

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

For the vectors given in Fig. 3-32, determine

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

For the vectors given in Fig. 3-32, determine (a) A-B+C, (b) A+B-C, and (c) C-A-B

AD

Alexis D.

Physics 101 Mechanics

2 years, 4 months ago

What is the force of gravity acting on a 210 kg spacecraft which has a circular orbit at a distance 1330 km from the surface of the Earth? At what speed is the satellite traveling around the earth?

lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

1. A train travelled at 30 m/s when the driver applies the brakes, producing a deceleration of 1 m/s2 for 20 s. a) What is the final speed of the train? b) How far does the train travel while the brakes are on?

AS

Aanshumaan S.

Physics 101 Mechanics

2 years, 4 months ago

How to calculate the friction by classical mechanics?

mj

Marry J.

Physics 101 Mechanics

2 years, 4 months ago

A 15.0 kg crate, initially at rest, slides down a ramp 2.0 m long and inclined at an angle of 20° with the horizontal. If there is no friction between ramp surface and crate, what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.81 m/s2)

RE

Reid E.

Physics 101 Mechanics

2 years, 4 months ago

Find the force the rope between the sleds exerts on each sled.

RE

Reid E.

Physics 101 Mechanics

2 years, 4 months ago

The dogs of four-time Iditarod Trail Sled Dog Race champion Jeff King pull two 100-kg sleds that are connected by a rope. The sleds move on an icy surface. The dogs exert a 240-N force on the rope attached to the front sled. The front rope pulls horizontally.

RE

Reid E.

Physics 101 Mechanics

2 years, 4 months ago

Rank the crates on the basis of the frictional force acting on them.

RE

Reid E.

Physics 101 Mechanics

2 years, 4 months ago

You want to use a rope to pull a 12-kg box of books up a plane inclined 30? above the horizontal. The coefficient of kinetic friction is 0.25. The rope pulls parallel to the incline.

RE

Reid E.

Physics 101 Mechanics

2 years, 4 months ago

The equations below are the horizontal x- and vertical y-component forms of Newton's second law applied to a physical process. (5.0kg)ax=(50N)cos30?+Ncos90??0.5Ncos0?+(5.0kg)(9.8N/kg)cos90? (5.0kg)0=(?50N)sin30?+Nsin90?+0.5Nsin0??(5.0kg)(9.8N/kg)sin90?

RE

Reid E.

Physics 101 Mechanics

2 years, 4 months ago

Two blocks of masses m1 and m2 hang at the ends of a string that passes over the very light pulley with low friction bearings shown in (Figure 1).

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

Blocks of 1.0, 2.0, and 3.0 kg are lined up on a frictionless table, as shown in (Figure 1), with a 12-N force applied to the leftmost block.

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

Two large crates, with masses 640 kg and 490 kg, are connected by a stiff, massless spring (k=8.1kN/m) and propelled along an essentially frictionless, level factory floor by a force applied horizontally to the more massive crate.

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

Two masses are joined by a massless string. A 30-N force applied vertically to the upper mass gives the system a constant upward acceleration of 2.7 m/s2 .

RS

Runjhun S.

Physics 101 Mechanics

2 years, 4 months ago

Lake Erie contains roughly 4.00  1011 m3 of water. (a) How much energy is required to raise the temperature of this volume of water from 11.0°C to 12.0°C? (b) Approximately how many years would it take to supply this amount of energy with the use of a 1 000-MW wasted energy output of an electric power plant?

RS

Runjhun S.

Physics 101 Mechanics

2 years, 4 months ago

A 3.00-g copper penny at 25.0°C drops from a height of 50.0 m to the ground. (a) If 60.0% of the change in potential energy goes into increasing the internal energy, what is its final temperature? (b) Does the result you obtained in (a) depend on the mass of the penny? Explain

RS

Runjhun S.

Physics 101 Mechanics

2 years, 4 months ago

A 200-kg mass and a 500-kg mass are separated by 0.400 m. (a) Find the net gravitational force exerted by these masses on a 50.0-kg mass placed midway between them. (b) At what position (other than infinitely remote ones) can the 50.0-kg mass be placed so as to experience a net force of zero?

RS

Runjhun S.

Physics 101 Mechanics

2 years, 4 months ago

A 200-kg mass and a 500-kg mass are separated by 0.400 m. (a) Find the net gravitational force exerted by these masses on a 50.0-kg mass placed midway between them. (b) At what position (other than infinitely remote ones) can the 50.0-kg mass be placed so as to experience a net force of zero?

VP

Venomous P.

Physics 101 Mechanics

2 years, 4 months ago

Search results for "C. Suppose you adjust your garden hose nozzle for a fast stream of water. You point the nozzle vertically upward at a height of 2.0m above the ground. When you quickly turn-off the nozzle, you hear the water striking the ground next to you for another 2.0s. What is the total distance traveled by the water?"

HK

Hritik K.

Physics 101 Mechanics

2 years, 4 months ago

A point charge is placed at each corner of a square

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

Two forces act on a 3.2-kg mass that undergoes acceleration a? =0.91i^?0.22j^m/s2.

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

A skier starts from rest at the top of a 23 ? slope 1.3 km long.

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

A hockey puck is given an initial speed of 16 m/s

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

Movers slide a 69-kg file cabinet along a floor where the coefficient of kinetic friction is 0.75.

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

A 14.6-kg monkey hangs from the middle of a massless rope, each half of which makes an 11.0 ? angle with the horizontal.

AP

Andrew P.

Physics 101 Mechanics

2 years, 4 months ago

A child sleds down a 8.5? slope at constant speed.

VV

Vanda V.

Physics 101 Mechanics

2 years, 4 months ago

What system of representation is used for the threaded portions?

VV

Vanda V.

Physics 101 Mechanics

2 years, 4 months ago

What system of representation is used for the threaded portions?

EK

Elana K.

Physics 101 Mechanics

2 years, 4 months ago

A fugitive tries to hop on a freight train traveling at a constant speed of 6.0 m / s. Just as an empty box car passes him, the fugitive starts from rest and accelerates at 4.0 m / s^2 to a maximum speed of 8.0 m / s. (a) How long does it take him to catch up to the empty box car? (b) What is the distance traveled to reach the box car?

EK

Elana K.

Physics 101 Mechanics

2 years, 4 months ago

A stone is dropped from the roof of a building; 2.00 s after that, a second stone is thrown straight down with an initial speed of 20.0 m / s, and the two stones land at the same time.

SS

Sarah S.

Physics 101 Mechanics

2 years, 4 months ago

A baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 30.0° from the horizontal with a velocity of 40.0 m/s. Ignore air resistance. A) How long (time in sec) will it travel in the air? B) How far (horizontal range in meters) will it travel in the air?

GC

Gerlie C.

Physics 101 Mechanics

2 years, 4 months ago

The density of air under standard laboratory conditions is 1.29km/m3 and about 20% of that air consists of oxygen. Typically, people breathe about of ½ air per breath. (a) How many grams of oxygen does a person in a day? (b) If this air is stored uncompressed in a cubical tank, how long is each side of the tank?

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

(Friction and Newton’s Laws). A 100. kg crate rests on the level bed of a truck which is accelerating forward and is only held in place by friction and not secured with any straps. If the coefficient of static friction between the crate and truck bed is ?s = 0.35, what is the maximum acceleration the truck can sustain without causing the crate to slide backwards?

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

Static Equilibrium). A 75.0 kg traffic light is supported by cables as shown in the figure. Find the tensions T1, T2, and T3, in each of the three support cables.

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

A 3.00 kg mass hangs from the ceiling of an elevator by a rope, as shown in the figure. Find the tension in the rope if the elevator is accelerating upwards at a rate of 0.30 m/s2.

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

A large container ship out at sea is underway at a speed of 23.0 knots with a heading of 15º S of W, while moving through a steady ocean current of 5.00 knots directed at 12º N of W. What is the magnitude and direction of the velocity vector of the container ship with respect to the Earth?

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

A tennis ball is fired from a canon over level ground with a velocity of 20.0 m/s, at an angle of 45º above the horizontal towards a wall 30.0 m away, as shown in the figure. At what height, h, above the ground will the tennis ball strike the wall?

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

A large container ship out at sea is underway at a speed of 23.0 knots with a heading of 15º S of W, while moving through a steady ocean current of 5.00 knots directed at 12º N of W. What is the magnitude and direction of the velocity vector of the container ship with respect to the Earth?

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

A 3.00 kg mass hangs from the ceiling of an elevator by a rope, as shown in the figure. Find the tension in the rope if the elevator is accelerating upwards at a rate of 0.30 m/s2.

BK

Brandon K.

Physics 101 Mechanics

2 years, 4 months ago

A 75.0 kg traffic light is supported by 3 cables where 2 cables connect at one point with the third. The two angles made by the cables are 45 degrees and 30 degrees. Find the tensions T1, T2, and T3, in each of the three support cables.

SA

Sheryl A.

Physics 101 Mechanics

2 years, 4 months ago

I wonder how you square sin on a calculator in the equation that starts with dy=vo^2sintheta/2g

SA

Sheryl A.

Physics 101 Mechanics

2 years, 4 months ago

I wonder how you square sin on a calculator in the equation that starts with dy=vo^2sintheta/2g

SA

Sheryl A.

Physics 101 Mechanics

2 years, 4 months ago

I wonder how you square sin on a calculator in the equation that starts with dy=vo^2sintheta/2g

SA

Sheryl A.

Physics 101 Mechanics

2 years, 4 months ago

This is the problem: An archer shoots an arrow over a castle wall by launching it with an initial speed of 32 m/s at 61 ? above horizontal. Assume the arrow lands on the other side of the castle wall at the same elevation as the launch point. Part C: What is the vertical component of the arrow's velocity just before it lands on the other side of the castle wall? Question: I watched Nicholas M. tutorial video of this problem and I keep getting the wrong answer, I think I'm not inserting the right numbers in the formula. The answer is supposed to be -25 m/s

SA

Sheryl A.

Physics 101 Mechanics

2 years, 4 months ago

This is the problem: An archer shoots an arrow over a castle wall by launching it with an initial speed of 32 m/s at 61 ? above horizontal. Assume the arrow lands on the other side of the castle wall at the same elevation as the launch point. Part C: What is the vertical component of the arrow's velocity just before it lands on the other side of the castle wall? Question: I watched Nicholas M. tutorial video of this problem and I keep getting the wrong answer, I think I'm not inserting the right numbers in the formula. The answer is supposed to be -25 m/s

SA

Sheryl A.

Physics 101 Mechanics

2 years, 4 months ago

Problem: A sailboat runs before the wind with a constant speed of 4.2 in a direction north of west. How far (a) west and (b) north has the sailboat traveled in 25 ? The tutorial video of Mike G did not show to get the measurement of the meter which the questions ask for

rj

Ria J.

Physics 101 Mechanics

2 years, 4 months ago

A grasshopper hops along

HK

Hritik K.

Physics 101 Mechanics

2 years, 4 months ago

A point charge is placed at each corner of a square with side length . The charges all have the same magnitude Two of the charges are positive and two are negative, as shown in Fig. E21.30. What is the direction of the net electric field at the center of the square due to the four charges, and what is its magnitude in terms of and ?

RU

Rene U.

Physics 101 Mechanics

2 years, 4 months ago

a garage hydraulic lift has two circular pistons, one of radius 3.7 cm, and the other 4.4 cm. The lift is designed to lift a 1280 kg car. what maximum force must a person exert to lift the car? what is the pressure in the output piston?

Alex L.

Physics 101 Mechanics

2 years, 4 months ago

The angular velocity of a car wheel changes from 4 rad/s to 20 rad/s in 25 s. if the wheel has a radius of 350 mm, what is The angular acceleration of the wheel? 

Jake S.

Physics 101 Mechanics

2 years, 4 months ago

A freon leak in the sir-conditioning system of a large building releases 15 kg of CHF2Cl per month.\r\nif a leak were allowed to continue, how many kilograms of Cl would be emitted into the atmosphere each year?\r\nExpress your answer using significant figures

Jake S.

Physics 101 Mechanics

2 years, 4 months ago

a garage hydraulic lift has two circular pistons, one of radius 3.7 cm, and the other 4.4 cm. The lift is designed to lift a 1280 kg car. what maximum force must a person exert to lift the car? what is the pressure in the output piston?

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

a tiger leaps horizontally from a 6.5 m high rock with a speed of 3.5 m/s. How far

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

a fire hose held near the ground shoots water at a speed of 6.8m/s. At what angles should the nozzle point in order that the water lands 2.0m away

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

a fire hose held near the ground shoots water at a speed of 6.8m/s. At what angles should the nozzle point in order that the water lands 2.0m away

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

A ball is thrown horizontally from the roof of a building 45.0 m tall and lands 24.0 m from the base. What is the ball's initial speed?

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

The pilot of an airplane traveling 180km/h wants to drop supplies to flood victims isolated

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

a projectile is shot from the edge of a cliff 125m above ground level with an initial speed of 65m/s at an angle of

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

Huck Finn walks at a speed of 0.60m/s

JF

Jillian F.

Physics 101 Mechanics

2 years, 4 months ago

a stunt driver wants to make his car jump over eight cars parked side by side below a horizontal ramp

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

Suppose an SUV with mass m= 3260 kg has a head-on collision with a subcompact car of mass m= 1194 kg and exerts a force of 2.9·105N on the subcompact. What is the magnitude of the force the subcompact exerts on the SUV?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A snowboarder (mass 72.9 kg, height 1.79 m) glides down aslope with an angle of 22°with respect to the horizontal: ?k= 0.2. What is his acceleration?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A wedge of mass m= 37.7kg is held in place on an inclined plane that makes an angle of ?= 20.5° with respect to the horizontal. A force F= 309.3 N in the horizontal direction pushes on the wedge. The coefficient of kinetic friction between the wedge and the plane is ?k= 0.171. What is the acceleration of the wedge along the plane when it is released and free to move?

BB

Bonke B.

Physics 101 Mechanics

2 years, 4 months ago

water moves from a hose pipe with diameter of 9cm to a nozzle with diameter of 3cm. (a) find the pressure drop? (b) calculate the maximum height above the nozzle to which the water can rise?

BB

Bonke B.

Physics 101 Mechanics

2 years, 4 months ago

An average-sized asteroid located 5.0*10^7km from earth with mass 2.0*10^13 kg is detected headed directly toward earth with speed of 2.0km/s. What will its speed be just before it hits our atmosphere?

BB

Bonke B.

Physics 101 Mechanics

2 years, 4 months ago

consider a particle moving with a velocity v(t)=(2i+4t)m/s (a) find its momentum as a function of time ? (b) calculate its net force.

BB

Bonke B.

Physics 101 Mechanics

2 years, 4 months ago

consider a particle moving with a velocity v(t)=(2i+4t)m/s (a) find its momentum as a function of time ? (

TM

Tshembo M.

Physics 101 Mechanics

2 years, 4 months ago

1) Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. The tracheae begin at the surface of an insect’s body and penetrate into the interior. Suppose that a trachea is 1.9 mm long with a cross-sectional area of m2. The concentration of oxygen in the air outside the insect is 0.28 kg/m3, and the diffusion constant is m2/s. If the mass per second of oxygen diffusing through a trachea is kg/s, find the oxygen concentration at the interior end of the tube.

TM

Tshembo M.

Physics 101 Mechanics

2 years, 4 months ago

The three finalists in a contest are brought to the centre of a large, flat field. Each is given a meter stick, a compass, a calculator, a shovel, and (in a different order for each) the following three displacements: 72.4m, 32? east of north, 57.3m, 36? south of west, 17.8m straight south. The three displacements lead to the point where the keys to a new Porsche are buried. Two contestants start measuring immediately, but the winner first calculates where to go. What does he calculate?

Hs

Harry S.

Physics 101 Mechanics

2 years, 4 months ago

Sketch the equivalent shell lines for the two equal positive charges shown in figure 5 indicate direction of increasing potential

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A box is sliding with a constant speed of 4.04 m/s in the +x-direction on a horizontal, frictionless surface. At x = 0 the box encounters a rough patch of the surface, and then the surface becomes even rougher. Between x = 0 and x = 2.00 m, the coefficient of kinetic friction between the box and the surface is 0.200; between x = 2.00 m and x = 4.00 m, it is 0.400. What is the x-coordinate of the point where the box comes to rest?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A 5.00 kg box sits at rest at the bottom of a ramp that is 9.00 m long and is inclined at 30.0 ? above the horizontal. The coefficient of kinetic friction is ?k = 0.40, and the coefficient of static friction is ?s = 0.43. What constant force F, applied parallel to the surface of the ramp, is required to push the box to the top of the ramp in a time of 6.00 s?

TM

Tshembo M.

Physics 101 Mechanics

2 years, 4 months ago

A 55kg carton of bananas with an initial speed of 0.45m/s slides down a ramp inclined at an angle of 23? with the horizontal. If the coefficient of friction between the carton and the ramp is 0.24, how fast will the carton be moving after it has travelled a distance of 2.1m down the ramp?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

Two boxes, A and B, are connected to each end of a light vertical rope, as shown in the following figure. A constant upward force 82.0 N is applied to box A. Starting from rest, box B descends 11.3 m in 3.40 s . The tension in the rope connecting the two boxes is 34.0 N. What is the mass of box B?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

Consider two blocks connected as shown in (Figure 1). Block A has mass 2.00 kg, and block B has mass 5.00 kg. The table on which B sits is frictionless, the cord connecting the blocks is light and flexible, and the pulley is light and frictionless. The horizontal force F? has magnitude F = 20.0 N, and block B moves to the left with an acceleration of 1.90 m/s2 . What is the tension in the cord that connects the two blocks?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

block A weighs 45.0 N and block B weighs 24.0 N. The system is released from rest, and block B has speed 3.30 m/s after it has descended 2.00 m. While the blocks are moving, what is the tension in the rope connecting the blocks?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A 4.50 kg crate is suspended from the end of a short vertical rope of negligible mass. An upward force F(t) is applied to the end of the rope, and the height of the crate above its initial position is given by y(t)=(2.80m/s)t+(0.610m/s3)t3. What is the magnitude of the force F when t = 4.40 s ?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

Block A in the figure (Figure 1) weighs 1.53 N , and block B weighs 4.17 N . The coefficient of kinetic friction between all surfaces is 0.40. Find the magnitude of the horizontal force F? necessary to drag block B to the left at constant speed if A and B are connected by a light, flexible cord passing around a fixed, frictionless pulley.

TM

Tshembo M.

Physics 101 Mechanics

2 years, 4 months ago

A student holding a rod by the centre subjects it to a torque of 1.4Nm about an axis perpendicular to the rod, turning it through 1.3rad in 0.75s. When the student holds the rod by the end applies the same torque to the rod, through how many radians will the rod turn in 1.0s?

DS

Divina S.

Physics 101 Mechanics

2 years, 4 months ago

American football uses a field that is 100 yd long, whereas a regulation soccer field is 100 m long. Which field is longer, and by how much (give yards, meters, and percent)?

TM

Tshembo M.

Physics 101 Mechanics

2 years, 4 months ago

some hot water was added to twice its mass of cold water at 10 degrees celsius. The resulting temperature of the mixture was 20 degrees celsius. What was the temperature of the hot water?

TM

Tshembo M.

Physics 101 Mechanics

2 years, 4 months ago

how much heat must be absorbed by720g of ice at -10 degrees celsius to take it to a liquid state at15 degrees celsius?

AA

Aysel A.

Physics 101 Mechanics

2 years, 4 months ago

problem 2.69

DS

Divina S.

Physics 101 Mechanics

2 years, 4 months ago

4. One hectare is defined as 1.000 * 104 m2. One acre is 4.356 * 104 ft2. How many acres are in one hectare?

DS

Divina S.

Physics 101 Mechanics

2 years, 4 months ago

A heavy rainstorm dumps 1.0 cm of rain on a city 5 km wide and 8 km long in a 2-h period. How many metric tons A1 metric ton = 103 kgB of water fell on the city? (1 cm3 of water has a mass of 1 g = 10–3 kg.) How many gallons of water was this?

ND

Nomcebo D.

Physics 101 Mechanics

2 years, 4 months ago

principle bernoulli

DS

Divina S.

Physics 101 Mechanics

2 years, 4 months ago

Let rAl represent the density of aluminum and rFe that S of iron. Find the radius of a solid aluminum sphere that balances a solid iron sphere of radius r Fe on an equal-arm balance.

DS

Divina S.

Physics 101 Mechanics

2 years, 4 months ago

A vertical container with base area measuring 14.0 cm by 17.0 cm is being filled with identical pieces of candy, each with a volume of 50.0 mm 3 and a mass of 0.0200 g.Assume that the volume of the empty spaces between the candies is negligible. If the height of the candies in the container increases at the rate of 0.250 cm/s, at what rate (kilograms per minute) does the mass of the candies in the container increase?

EB

Eboni B.

Physics 101 Mechanics

2 years, 4 months ago

An oak barrel is filled with water and then tightly sealed. A hole is drilled in the barrel's top, and a narrow, open tube is fitted securely into the hole. Water is then slowly added to the tube. When the height of the water column reaches a certain point, the barrel bursts apart. Explain this occurrence using the principles of fluid physics. (This experiment is called Pascal's barrel and was allegedly performed by Pascal in 1646, although there is no mention of this demonstration anywhere in his archived papers.)

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

Consider a force ????1 = ????/????? which acts on an object during its journey along the x axis from x= 0.0 m to x = 1.0 m, where A = 2.0 Nm1/2. Show that during this journey, even though F1 is infinite at x= 0.0 m, the work done on the object by this force is finite.

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

Consider a force ????1 = ????/????? which acts on an object during its journey along the x axis from x= 0.0 m to x = 1.0 m, where A = 2.0 Nm1/2. Show that during this journey, even though F1 is infinite at x= 0.0 m, the work done on the object by this force is finite.

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

Consider a force ????1 = ????/????? which acts on an object during its journey along the x axis from x= 0.0 m to x = 1.0 m, where A = 2.0 Nm1/2. Show that during this journey, even though F1 is infinite at x= 0.0 m, the work done on the object by this force is finite.

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

Consider a force ????1 = ????/????? which acts on an object during its journey along the x axis from x= 0.0 m to x = 1.0 m, where A = 2.0 Nm1/2. Show that during this journey, even though F1 is infinite at x= 0.0 m, the work done on the object by this force is finite.

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

How much work must be done to stop the 1300 car traveling at 95 km/h?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

An 85 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 75 cm. What is the speed of the arrow as it leaves the bow?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

A 1200 kg car rolling on a horizontal surface has speed v = 66 km/h when it strikes a horizontal coil spring and is brought to rest in a distance of 2.2 m. What is the spring constant of the spring?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

A spring with k = 63 N/m hangs vertically next to a ruler. The end of the spring is next to 15 cm mrk on the ruler. If a 2.5 kg mass is now attached at the spring, where will the end of the spring line up with the ruler mark?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

In a high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of the pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.10 m and cross the bar with the speed of 0.70 ms-1 ?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

A 145 g baseball is dropped from a tree 14.0 m above the ground. (a) With what speed would it hit the ground if air resistance could be ignored? (b) If it actually hits the ground with a speed of 8.00 ms-1 , what is the average force of air resistance exerted on it?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

You drop a ball from a height of 2.0 m, and it bounces back to a height of 1.5 m. (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball’s speed just before and just after the bounce? (c) Where did the energy go?

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A box with mass m sits at the bottom of a long ramp that is sloped upward at an angle ? above the horizontal. You give the box a quick shove, and after it leaves your hands it is moving up the ramp with an initial speed v0. The box travels a distance d up the ramp and then slides back down. When it returns to its starting point, the speed of the box is half the speed it started with; it has speed v0/2. What is the coefficient of kinetic friction between the box and the ramp? (Your answer should depend on only ?.)

JE

Jardel E.

Physics 101 Mechanics

2 years, 4 months ago

First consider a particle moving with a velocity v1 at an angle of ?1 with respect to the x-axis. During a time period ?t, the particle suddenly turns and travels at v2, at an angle of ?2 with respect to the x-axis. Give an expression for the average acceleration vector of this motion in terms of unit vectors i and j, assuming the angles are measured positive in the counterclockwise direction.

ER

Erik R.

Physics 101 Mechanics

2 years, 4 months ago

Positive charge is spread uniformly over the surface of a spherical balloon 70 cm in radius, resulting in an electric field of 40 kN/C at the balloon's surface

kT

Kirubel T.

Physics 101 Mechanics

2 years, 4 months ago

Two forces operate on a 4.50 kg mass as shown below in an overhead view. What third force must be added so that the mass accelerates at a rate of 1.00 m/s2 in the +y-direction? Give the magnitude and direction of that third force.

SI

Savannah I.

Physics 101 Mechanics

2 years, 4 months ago

Find the acceleration (magnitude in m/s2 and direction in degrees counterclockswise from the axis directed to the right) of the 8.00 kg sled. Note that the direction of the frictional force is unspecified; it will be in the opposite direction of the sum of F1 and F2.

AA

A A.

Physics 101 Mechanics

2 years, 4 months ago

A baseball is launched from the bat at an angle ?0= 30° with respect to the positive x-axis and with an initial speed of 40 m/s, and it is caught at the same height from which it was hit. Assuming ideal projectile motion (positive y-axis upward), the velocity of the ball when it is caught is?

SK

Serara K.

Physics 101 Mechanics

2 years, 4 months ago

A spaceship has length 120 m, diameter 25 m, and mass 4.0×103kg as measured by its crew. As the spaceship moves parallel to its cylindrical axis and passes us, we measure its length to be 80 m. What do we measure its diameter to be? What do we measure the magnitude of its momentum to be?

EB

Eboni B.

Physics 101 Mechanics

2 years, 4 months ago

Explain why a smoothly flowing stream of water from a faucet often gets progressively narrower in cross-section as the water falls (see the figure below). As the stream of water leaves the faucet with cross section A1, it is traveling at velocity v1. As the water continues to fall, it undergoes acceleration due to gravity and speeds up as it falls. Thus the bottom part of the water stream is falling at the same speed as the top part. In a section of flowing water with the larger cross section area, A1, the velocity v1 is ---Select--- and in a section of flowing water with the smaller cross section, A2, the velocity v2 is ---Select--- . Since water is an incompressible fluid and follows the laws of conservation of mass, we can surmise that A1v1 ? A2v2. In the case of the falling water, since v1 ? v2, it must be true that A1 ? A2, which means the water stream narrows as it falls

TR

Tommy R.

Physics 101 Mechanics

2 years, 4 months ago

The velocity-versus-time graph for an object moving in a straight line is given in the figure below. The graph shows velocity as a function of time. Time is measured from 0 to 1.0 second on the x axis. Velocity is measured from 0 to 5 meters per second on the y axis. Velocity linearly increases from 0.5 meters per second at 0 seconds to 4.5 meters per second at 1.0 second. Part A What is the acceleration of this object?

ls

Lemonade S.

Physics 101 Mechanics

2 years, 4 months ago

Assume that the critical stress intensity factor or fracture toughness ðKIcÞ for a partially stabilized zirconia is 10 MPa-m1=2. If there is a plate of this ceramic with a sharp edge notch 100 mm deep and subjected to a stress of 300 MPa, will this plate be able to withstand this stress?

Cl

Carl L.

Physics 101 Mechanics

2 years, 4 months ago

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. If the plane is traveling horizontally with a speed of 250km/h. How far in advance of the recipients (horizontal distance) must the goods be dropped?

Cl

Carl L.

Physics 101 Mechanics

2 years, 4 months ago

A projectile is launched from ground level to the top of a cliff which is 195 m away and 135 m high (see Fig. 3–56). If the projectile lands on top of the cliff 6.6 s after it is fired, find the initial velocity of the projectile (magnitude and direction). Neglect air resistance.

VS

Victoria S.

Physics 101 Mechanics

2 years, 4 months ago

Two snowcats in Antarctica are towing a housing unit north, as shown in the figure below. The sum of the forces \vec{F}_A and \vec{F}_B exerted on the unit by the horizontal cables is north, parallel to the line L, and FA = 4703.3 N. Determine FB.

LN

Lemon N.

Physics 101 Mechanics

2 years, 4 months ago

A 585 g squirrel with a surface area of 925 cm2 falls from a 5.6-m tree to the ground. Estimate its terminal velocity. (Use the drag coefficient for a horizontal skydiver. Assume that the squirrel can be approximated as a rectangular prism with cross-sectional area of width 11.5 cm and length 23 cm. Note, the squirrel may not reach terminal velocity by the time it hits the ground. Give the squirrel's terminal velocity, not it's velocity as it hits the ground.) I followed the example from the videos I found here, but the answer I got wasn't correct. I'm not sure what to do with the additional info regarding the rectangular prism cross section

VS

Victoria S.

Physics 101 Mechanics

2 years, 4 months ago

A person pushes a 27.8-kg lawn mower at constant speed with a force of F = 107.8 N. directed along the handle, which is at an angle of 36.6° to the horizontal (see the figure above). Calculate the horizontal friction force on the mower.

BN

Beverly N.

Physics 101 Mechanics

2 years, 4 months ago

En una rendija doble, la rendija 1 es más ancha que la 2, de modo que la luz de la rendija 1 tiene una amplitud 3 veces mayor que la luz de la rendija 2. Demuestre que, para esta situación

BN

Beverly N.

Physics 101 Mechanics

2 years, 4 months ago

La figura muestra tres situaciones en las que dos rayos de sol penetrar levemente y luego esparcirse fuera del suelo lunar. Suponga que los rayos están inicialmente en fase. ¿En qué situación es más probable que las ondas asociadas terminen en fase? (Justo cuando la Luna se llena, su brillo repentinamente alcanza su punto máximo, llegando a ser un 25% mayor que su brillo en las noches anteriores y posteriores, porque en la Luna llena interceptamos ondas de luz que son dispersadas por el suelo lunar hacia el Sol y sufren interferencias constructivas Antes de que los astronautas aterrizaran por primera vez en la Luna, a la NASA le preocupaba que la retrodispersión de la luz solar del suelo pudiera cegar a los astronautas lunares si no tenían protectores de visualización adecuados en sus cascos).

BN

Beverly N.

Physics 101 Mechanics

2 years, 4 months ago

The figure shows three situations in which two rays of sunlight penetrate slightly and then scatter off the lunar soil. Assume that the rays are initially in phase. In which situation are the associated waves most likely to end in phase? (Just as the Moon is full, its brightness suddenly peaks, becoming 25% greater than its brightness in the nights before and after, because in the full Moon we intercept light waves that are scattered by the lunar soil towards the Sun and suffer constructive interference Before the astronauts first landed on the Moon, NASA was concerned that the backscatter of sunlight from the ground could blind lunar astronauts if not they had proper screen protectors on their helmets).

MG

Mia G.

Physics 101 Mechanics

2 years, 4 months ago

Driving in your car with a constant speed of you encounter a bump in the road that has a circular cross section, as indicated in FIGURE If the radius of curvature of the bump is find the apparent weight of a person in your car as you pass over the top of the bump. I watched the video for this and he ends up with the equation N=m((g-v^2)/r) and that makes no sense and then on top of that he then solves that same equation to get 34 N.

MG

Mark G.

Physics 101 Mechanics

2 years, 4 months ago

When you normally drive the freeway between Sacramento and San Francisco at an average speed of 115 km/h k m / h (71.5 mi/h m i / h ), the trip takes 1 h h and 13 min m i n . On a Friday afternoon, however, heavy traffic slows you down to an average of 100 km/h k m / h (62.1 mi/h m i / h ) for the same distance.

MG

Mark G.

Physics 101 Mechanics

2 years, 4 months ago

On a Friday afternoon, however, heavy traffic slows you down to an average of 100 km/h k m / h (62.1 mi/h m i / h ) for the same distance. How much longer does the trip take on Friday than on the other days?

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

you put bottle of beer in a refrigerator and leave it until its temperature has dropped 8.9 K . What is it temperature change in celcius and fahrenheit?

BB

Bonke B.

Physics 101 Mechanics

2 years, 4 months ago

consider a 5kg particle moving with a velocity v(t)=(2i+4tj)m.s

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

Two ropes in a vertical plane exert equal-magnitude forces on a hanging weight but pull with an angle of 72.0° between them. What pull does each rope exert if their resultant pull is 372 N directly upward?

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

What is the radius in millimeter of huge disc with an area of 14,243 ft2?

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

A plane leaves the airport in Galisteo and flies 170 km at 68.0 east of north; then it changes direction to fly 230 km at 36.0 south of east, after which it makes an immediate emergency landing in a pasture. When the airport sends out a rescue crew, in which direction and how far should this crew fly to go directly to this plane?

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

On a training flight, a student pilot flies from Lincoln, Nebraska, to Clarinda, Iowa, next to St. Joseph, Missouri, and then to Manhattan, Kansas shown below. The directions are shown relative to north: 0 is north, 90 is east, 180 is south, and 270 is west. Use the method of components to find following: (a) The distance she has to fly from Manhattan to get back to Lincoln (b) The direction (relative to north) she must fly to get there. (c) Illustrate your solutions with a vector diagram.

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces A, B, and C shown in figure below. Find the magnitude and direction of a fourth force on the stone that will make the vector sum of the four forces zero

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

As a test of orienteering skills, your physics class holds a contest in a large, open field. Each contestant is told to travel 20.8 m due north from the starting point, then 38.0 m due east, and finally 18.0 m in the direction 33.0 west of south. After the specified displacements, a contestant will find a silver dollar hidden under a rock. The winner is the person who takes the shortest time to reach the location of the silver dollar. Remembering what you learned in class, you run on a straight line from the starting point to the hidden coin. How far and in what direction do you run?

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

during eiffel tower is built of wrought ironapproxiamately 299tall. during summer, the average temperature is 24 C

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

the eiffel tower is built of wrought iron approximately 299 m tall. During summer, the average temperature is 24 degree celcius and about 1 degree C during winter. Estimate how much its height change between the two seasons? (treat tower as a vertical beam)

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

If a runner runs 100 meters in 25 seconds, what is his speed in meters per second?

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

A bus is moving at a constant speed of 30m/s. How many hours will it take to travel 200 miles?

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

an ordinary glass is filled to the brim with 340 ml of water at 100 degree C. if the temperature decreased to 18.0 degree C, how much water could be added to the glass?

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

A motorcycle speeds up from 24 m/s to 60 m/s and travels a distance of 500m within that period

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

A golf ball is released from rest from the top of a very tall building. Neglecting air resistance, calculate a. the position and b. the velocity of the ball after 1.00, 2.00, and 3.00 s.

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

a glass flask whose volume is 1L at 1.0 degree C is completely filled with mercury at this temperature when flask and mercury are warmed to 50 degree , 8.5 L of mercury overflow. If the coefficient of volume expansion of mercury is 18.0 x 10 K, compute the coefficient of volume expansion of the glass?

CG

Clied G.

Physics 101 Mechanics

2 years, 4 months ago

A ball is dropped from rest on a cliff a. What is the velocity of the ball 5 sec later? b. What is the displacement of the ball during this time?

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

In an effort to stay awake for an all-night study session, a student makes a cup of coffee by first placing a 100-W electric immersion heater in 0.20 kg of water. (a) How much heat must be added to the water to raise its temperature from 10.0°C to 70°C? (b) How much time is required? Assume that all of the heater's power goes into heating the water.

Cl

Carl L.

Physics 101 Mechanics

2 years, 4 months ago

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. If the plane is traveling horizontally with a speed of 250km/h. How far in advance of the recipients (horizontal distance) must the goods be dropped?

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

What will be the equilibrium temperature when a 240 g block of copper at 280°C is placed in a 160g aluminum calorimeter cup containing 820g of water at 11°C?

Cl

Carl L.

Physics 101 Mechanics

2 years, 4 months ago

A projectile is launched from ground level to the top of a cliff which is 195 m away and 135 m high (see Fig. 3–56). If the projectile lands on top of the cliff 6.6 s after it is fired, find the initial velocity of the projectile (magnitude and direction). Neglect air resistance.

YB

Yna B.

Physics 101 Mechanics

2 years, 4 months ago

An aluminum tea kettle with mass 2.0 kg and containing 1.50 kg of water is placed on a stove. If no heat is lost to the surroundings, how much heat must be added to raise the temperature

JE

Jardel E.

Physics 101 Mechanics

2 years, 4 months ago

You stand at the edge of the indicated cliff and throw a ball 75 degrees above the horizontal with a speed of 7.5 meters per second. The ball lands 4.43 meters below with a speed of 17 meters per second. If you draw a coordinate system with the x-axis horizontal, what will be the first direction angle (alpha) for the initial velocity vector (vector v_0)?

BS

Bri S.

Physics 101 Mechanics

2 years, 4 months ago

Most students adamantly state that they would never have turned up the voltage in the Milligram experiment. Do you think you would have refused to shock the learner? Looking at your own past behavior, what evidence suggests that you would go along with the order to increase the voltage?

BS

Bri S.

Physics 101 Mechanics

2 years, 4 months ago

Most students adamantly state that they would never have turned up the voltage in the Milligram experiment. Do you think you would have refused to shock the learner? Looking at your own past behavior, what evidence suggests that you would go along with the order to increase the voltage?

BS

Bri S.

Physics 101 Mechanics

2 years, 4 months ago

Compare and contrast social loafing and social facilitation.

VS

Victoria S.

Physics 101 Mechanics

2 years, 4 months ago

Francesca dangles her watch from a thin piece of string while the jetliner she is in accelerates for takeoff, which takes about 16.7 s. Estimate the takeoff speed of the aircraft if the string makes an angle of 29.5° with respect to the vertical.

VS

Victoria S.

Physics 101 Mechanics

2 years, 4 months ago

Suppose the pulley in the figure below is suspended by a cord C. Determine the tension in the cord attached to the masses after the masses are released and before one hits the ground. Ignore the mass of the pulley and cords.

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

A proposed space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire), Fig. 5–39. The circle formed by the tube has a diameter of 1.1 km. What must be the rotation speed (revolutions per day) if an effect nearly equal to gravity at the surface of the Earth (say, 0.90 g) is to be felt?

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

On an ice rink two skaters of equal mass grab hands and spin in a mutual circle once every 2.5 s. If we assume their arms are each 0.80 m long and their individual masses are 55.0 kg, how hard are they pulling on one another?

CR

Cody R.

Physics 101 Mechanics

2 years, 4 months ago

The density of an object equals its mass divided by its volume. The mass of the earth is 6x10^24 kg and its radius is 4x10^3 miles. The mass of the sun is 2x10^33g and its radius is 7x10^5 km. Calculate the earths density divided by that of the sun

CR

Cody R.

Physics 101 Mechanics

2 years, 4 months ago

You drive for 30 min at 100km/h and then stop for 15min. You then drive for 45 min at 80 km/h. Your average speed for the entire trip is?

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Fernanda C.

Physics 101 Mechanics

2 years, 4 months ago

A radar station sends a signal to a ship which is located a distance 13.8 kilometers from the station at bearing 136° clockwise from the north. At the same moment, a helicopter is at a horizontal range of 19.6 kilometers, at bearing 154° clockwise from the north, with an elevation of 2.53 kilometers. Let east be the î direction, north be the ? direction, and up be the k direction. c) What If? The ship begins to sink at a rate of 5.30 m/s. Write the position vector (in km) of the ship relative to the helicopter as a function of time as the ship sinks. Assume that the helicopter remains hovering at its initial position and that the sinking rate remains the same even after the ship sinks under the surface. (Use the following as necessary: t. ) d) Evaluate the position of the ship relative to the helicopter (in km) after 1.60 h.

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Fernanda C.

Physics 101 Mechanics

2 years, 4 months ago

What If? The ship begins to sink at a rate of 5.30 m/s. Write the position vector (in km) of the ship relative to the helicopter as a function of time as the ship sinks. Assume that the helicopter remains hovering at its initial position and that the sinking rate remains the same even after the ship sinks under the surface. Evaluate the position of the ship relative to the helicopter (in km) after 1.60 h

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

A coin is placed 13.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 38.0 rpm (revolutions per minute) is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable?

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

Tarzan plans to cross a gorge by swinging in an arc from a hanging vine (Fig. 5–42). If his arms are capable of exerting a force of 1150 N on the vine, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 78 kg and the vine is 4.7 m long.

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

A pilot performs an evasive maneuver by diving vertically at 270 m/s. If he can withstand an acceleration of 8.0 g’s without blacking out, at what altitude must he begin to pull his plane out of the dive to avoid crashing into the sea?

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

Maggie the black lab who has a mass of 45.0 kg jumps on the merry-go-round that is rotating counterclockwise. Maggie sits down at 245 cm from the axis of rotation. If the merry-go-round turns 1 timein 6.00 seconds, what is her velocity? What is the centripetal acceleration? What is the centripetal force?

DP

Dave P.

Physics 101 Mechanics

2 years, 4 months ago

A moon named Phobos in orbit around the planet Mars experiences a gravitational force not only from the planet, but also from the Sun. During a solar eclipse Phobos is directly in line with Mars and the Sun, thus blocking the sunlight from reaching the planet. The moon has a mass of about 3.9 x 1021 kg. The mass of the planet is 2.4 x 1026 kg, and the mass of the Sun is 1.99 x 1030 kg. The distance from Phobos to the center of Mars is 6.0 x 108 m, and the distance from Phobos to the sun is 1.5 x 1011 m. Calculate the gravitational force between Phobos and Mars. Calculate the gravitational force between Phobos and the Sun. What is the ratio of the gravitational force on the moon due to the planet compared to its gravitational force due to the Sun during the eclipse?

iC

Irene C.

Physics 101 Mechanics

2 years, 4 months ago

Calculate the period of a satellite orbiting the Earth 200 km above the surface. The radius of the earth is 6400 km and the mass of the earth is close to 6×1024 kg.

BM

Bibi M.

Physics 101 Mechanics

2 years, 4 months ago

in an experiment a shearwater (a seabird was taken from its nest

BM

Bibi M.

Physics 101 Mechanics

2 years, 4 months ago

a dog runs from point a to b to c in 3.0 s ( see figure 2.41.)

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