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BM

Bibi M.

Physics 101 Mechanics

2 years, 4 months ago

a football quarterback runs 15.0 m straight down
ND

Natalia D.

Physics 101 Mechanics

2 years, 4 months ago

An object starts from rest and falls under the influence of gravity. Draw graphs of (a) its speed and (b) the distance it has fallen, as a function of time from t=0 to t = 5.00s. Ignore air resistance
BM

Bibi M.

Physics 101 Mechanics

2 years, 4 months ago

a car traveling 90 km/hr is 100m behind a truck traveling 50km/hr

BM

Bibi M.

Physics 101 Mechanics

2 years, 4 months ago

a car traveling 90 km/hr is 100m behind a truck traveling 50km/hr

BM

Bibi M.

Physics 101 Mechanics

2 years, 4 months ago

what is your average speed in each of these cases? you run 100m at a speed of 5 m/s
is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

Find the work done by a 45.0 N force in pulling the luggage carrier at angle ? = 50.0° for a distance 75.0 m?
is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

A 65 kg jogger is running at a speed of 5.30 ms-1 . (a) What is the kinetic energy of the jogger? (b) How much work is done by the net force that accelerates the jogger to 5.30 ms-1 from rest?
is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

What is the increase in the potential energy of a 2 kg box when lifted from the floor to a table 1 m high?

is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

. A 1 kg block is dropped from a height of 0.40 m onto a spring whose force constant k is 1960 Nm-1 . Find the maximum distance the spring will be compressed?
is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

. A 1 kg block is dropped from a height of 0.40 m onto a spring whose force constant k is 1960 Nm-1 . Find the maximum distance the spring will be compressed?
is

Irene S.

Physics 101 Mechanics

2 years, 4 months ago

A 6 kg block initially at rest is pulled to the right along horizontal, smooth surface by a horizontal force of 12 N. Find the speed of the block after it moves a distance of 3 m?
ES

Elle S.

Physics 101 Mechanics

2 years, 4 months ago

Mamenchisaurus, a sauropod dinosaur from Sichuan province in the Late Jurassic period, has one of the longest recorded necks of any species on Earth, ranging from 9 – 14 metres in length. Early reconstructions of sauropods placed them underwater like hippopotamus, with their heads protruding from the water like long breathing tubes or snorkels. Assuming a length from nose to lungs of 10.8 metres: a) Determine the pressure required to force air into the lungs if the dinosaur was underwater (assume a lake or other body of fresh water). (Units: Pa) b) If the lungs of the dinosaur are approximated as a sphere of radius 1.8 metres, what force would be required to keep them open against this pressure? (Units: Newtons)

SL

Serenity L.

Physics 101 Mechanics

2 years, 4 months ago

A satellite is placed in orbit 3.90 x 10^5 m above the surface of Jupiter. Jupiter has a mass of 1.90 x 10^27 kg and a radius of 7.14 x 10^7 m. Find the orbital speed of the satellite.
SL

Serenity L.

Physics 101 Mechanics

2 years, 4 months ago

A satellite is placed in orbit 3.90 x 10^5 m above the surface of Jupiter. Jupiter has a mass of 1.90 x 10^27 kg and a radius of 7.14 x 10^7 m. Find the orbital speed of the satellite.
LM

Lin M.

Physics 101 Mechanics

2 years, 4 months ago

1. At what angle does Gustav aims his rifle? 2. What target ring number will he hit? How many points does he get for this specific round?
lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

A 1.0 m long steel wire is of a diameter 1.0 mm. Find how much will the wire stretch if a 3 kg load is hung from its lower end. Young’s modulus of steel is 1.9 x 1011 N m-2.
lx

Lee X.

Physics 101 Mechanics

2 years, 4 months ago

A capacitor is charged with 9.6 nC and has a 120 V potential difference between its terminals. Compute its capacitance and the energy stored in it
aa

Anmd A.

Physics 101 Mechanics

2 years, 3 months ago

Mamenchisaurus, a sauropod dinosaur from Sichuan province in the Late Jurassic period, has one of the longest recorded necks of any species on Earth, ranging from 9 – 14 metres in length. Early reconstructions of sauropods placed them underwater like hippopotamus, with their heads protruding from the water like long breathing tubes or snorkels. Assuming a length from nose to lungs of 10.0metres: If the lungs of the dinosaur are approximated as a sphere of radius 2.0 metres, what force would be required to keep them open against this pressure?
JC

Jared C.

Physics 101 Mechanics

2 years, 3 months ago

A cart attached to a spring is given an initial push, displacing it from its equilibrium position. A graph of displacement as a function of time for the cart is shown at right. The system has a total initial energy of 12 J and there is no friction. Five points are labeled A–E in the graph
Ad

Anne D.

Physics 101 Mechanics

2 years, 3 months ago

a displacement vector in the xy plane is 15.0 m long and directed at angle= 30 degree. determine the x componene, y componenet and the resultant

Ad

Anne D.

Physics 101 Mechanics

2 years, 3 months ago

the x component of vector A is -25 m and the y component is 40.0 m. what is the magnitude? bearing of the resltant?

Ad

Anne D.

Physics 101 Mechanics

2 years, 3 months ago

a ships sails out to sail to a pont 120km due north
Ad

Anne D.

Physics 101 Mechanics

2 years, 3 months ago

a heav piece of machinery is raised by sliding it a distance
Ad

Anne D.

Physics 101 Mechanics

2 years, 3 months ago

a heavy piece of machinery is raised by sliding it a distance, d=16.5m along a plank oriented at angle=m24.0 to the horizontal. how far is it moved vertically and horizontally

Ad

Anne D.

Physics 101 Mechanics

2 years, 3 months ago

a person walks in the following pattern; 3.7km due nort, then 2.1 km ue west and finally 5.6 due south. sketch the free body diagram that reprsent this motoi, how far and in what direction would a bird fly i a straight lne from the same starting point to the same final point

cR

Carly R.

Physics 101 Mechanics

2 years, 3 months ago

Speedy Sue, driving at 30.0 m/s, enters a one-lane tunnel. She thenobserves a slow-moving van 155 m ahead traveling at 5.00 m/s.Sue applies her brakes but can accelerate only at -2.00 m/s^2because the road is wet. Will there be a collision? State how youdecide. If yes, determine how far into the tunnel and at what timethe collision occurs. If no, determine the distance of closestapproach between Sue's car and the van.
cR

Carly R.

Physics 101 Mechanics

2 years, 3 months ago

suppose that you leave your house, drive to the grocery store to pick up some chips and soda and then drive to your friends house to watch the super bowl. you spend 5 minutes at the grocery store and the entire trip took 19.3 minutes

BD

Benjamin D.

Physics 101 Mechanics

2 years, 3 months ago

A 500-g toy sailboat is in a swimming pool where a child has set up a fan to blow on it with a force of 0.100 N in the direction 30.0º north of east. At the same time, a wind is blowing with a force of 0.200 N in the direction 20.0º south of west. Ignore resistive forces. (a) Draw a free-body diagram of the system. (b) What is the net force on the sailboat? (c) What is the acceleration of the sailboat? (d) If the sailboat starts at rest, what is its velocity after 3.00 s?
BD

Benjamin D.

Physics 101 Mechanics

2 years, 3 months ago

A force F = 21 iN pushes on mass m1 = 2.0 kg as shown in the diagram to the right. Mass (m1) is in direct contact with mass m2 = 4.0 kg, and both masses rest on a frictionless surface. (a) What is the acceleration of m1 (b) What is the acceleration of m2 (c) Explain why your answers for (a) and (b) make sense, conceptually. (d) What is the force of m1 pushing on m2 (e) What is the force of m2 pushing on m1?(f) Explain why your answers to (d) and (e) make sense, conceptually. (g) The force F is then removed from the system. Describe the subsequent motion of and m1 and m2.
JC

Jared C.

Physics 101 Mechanics

2 years, 3 months ago

What kinds of qualitative radial motions are possible for this object? Specifically, for what system energies E would the small object’s radial distance from the black hole (1) maintain a fixed value, (2) oscillate between two values, (3) come in from infinity and then go back out to infinity, and (4) be absorbed by the black hole at r = 0? Specify if any of these cases are impossible.
er

Emily R.

Physics 101 Mechanics

2 years, 3 months ago

Two identical machines are positioned the same distance from a worker. The intensity of sound delivered by each operating machine at the worker’s location is 2.0x10^-7 W/m^2. (a) Find the sound level heard by the worker when one machine is operating. (b) find the sound level heard by the worker when two machines are operating.
MR

Mia R.

Physics 101 Mechanics

2 years, 3 months ago

A red car accelerates at 4 m/ss from rest for four seconds. What is the average velocity after ten seconds?
MR

Mia R.

Physics 101 Mechanics

2 years, 3 months ago

A red car accelerates at 4 m/ss from rest for four seconds. What is the instantaneous Velocity when T=10 s ?

TM

Tshembo M.

Physics 101 Mechanics

2 years, 3 months ago

Two radioactive waste products from nuclear reactors are strontium (S presubscript 38 presuperscript 90 r space )(T subscript bevelled 1 half end subscript equals 29.1 y r) and cesium (C presubscript 55 presuperscript 134 s) (T subscript bevelled 1 half end subscript equals 2.06 y r). These two species are present initially in a ratio of (N subscript 0 comma S r end subscript over N subscript 0 comma C s end subscript equals 7.80 cross times 10 to the power of negative 3 end exponent). What is the ratio (N subscript S r end subscript over N subscript C s end subscript) twelve years later?

BN

Beverly N.

Physics 101 Mechanics

2 years, 3 months ago

Para tres experimentos, la figura da el parámetro ???? versus ángulo ???? para interferencia de dos rendijas usando luz de longitud de onda de 500 nm. Las separaciones de rendijas en los tres experimentos difieren. Clasifique el experimentos de acuerdo con (a) las separaciones de rendijas y (b) los máximos de interferencia de rendija en el patrón, el mayor primero.

BN

Beverly N.

Physics 101 Mechanics

2 years, 3 months ago

For three experiments, the figure gives the parameter ???? versus angle ???? for interference of two slits using light with a wavelength of 500 nm. The slit separations in the three experiments differ. Classify the experiments according to (a) the slit separations and (b) the slit interference maxima in the pattern, whichever is higher.
AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

A skier starts from rest at the top of a hill that is inclined at 10.9° with respect to the horizontal. The hillside is 155 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the coefficient of friction is unchanged. How far does the skier glide along the horizontal portion of the snow before coming to rest?
AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

An 80.0-kg skydiver jumps out of a balloon at an altitude of 1,180 m and opens the parachute at an altitude of 195.0 m. Assuming that the total retarding force on the diver is constant at 50.0 N with the parachute closed and constant at 3,600 N with the parachute open, what is the speed of the diver when he lands on the ground?

AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

When a 2.80-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.72 cm. (c) How much work must an external agent do to stretch the same spring 9.00 cm from its unstretched position?

Gh

Grace H.

Physics 101 Mechanics

2 years, 3 months ago

27-65, ????????1.2kV, C????6.5mF, R1 ???? R2 ???? R3 ???? 0.73 M????. With C completely uncharged, switch S is suddenly closed (at t ???? 0).At t ???? 0, what are (a) current i1 in resistor 1, (b) current i2 in resistor 2, and (c) current i3 in resistor 3? At t ???? ???? (that is, after many time constants), what are (d) i1, (e) i2, and (f) i3? What is the potential difference V2 across resistor 2 at (g) t ???? 0 and (h) t ???? ????? (i) Sketch V2 versus t be- tween these two extreme times.
Gh

Grace H.

Physics 101 Mechanics

2 years, 3 months ago

27-65, ????????1.2kV, C????6.5mF, R1 ???? R2 ???? R3 ???? 0.73 M????. With C completely uncharged, switch S is suddenly closed (at t ???? 0).At t ???? 0, what are (a) current i1 in resistor 1, (b) current i2 in resistor 2, and (c) current i3 in resistor 3? At t ???? ???? (that is, after many time constants), what are (d) i1, (e) i2, and (f) i3? What is the potential difference V2 across resistor 2 at (g) t ???? 0 and (h) t ???? ????? (i) Sketch V2 versus t be- tween these two extreme times.
JE

Jardel E.

Physics 101 Mechanics

2 years, 3 months ago

A fireman has mass m; he hears the fire alarm and slides down the pole with acceleration a (which is less than g in magnitude). (a) Write an equation giving the vertical force he must apply to the pole. (b) If his mass is 90.0 kg and he accelerates at 5.00 m/s2, what is the magnitude of his applied force?
JE

Jardel E.

Physics 101 Mechanics

2 years, 3 months ago

Problem 3: Two blocks of unequal mass are tied together with a massless string that does not stretch and connected via a frictionless and massless pulley. Mass one, M1, rests on a frictionless table top. Mass two, M2, is released and both blocks begin to move.
JE

Jardel E.

Physics 101 Mechanics

2 years, 3 months ago

A boxer's fist and glove have a mass of m = 0.98 kg. The boxer's fist can obtain a speed of v = 9.75 m/s in a time of t = 0.21 s.
JE

Jardel E.

Physics 101 Mechanics

2 years, 3 months ago

A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well. The farmer uses a force F1 = 49 N to pull the bucket of water upwards at a constant speed. The bucket, when empty, has a mass of mb = 1.1 kg.

JE

Jardel E.

Physics 101 Mechanics

2 years, 3 months ago

A car and a dump truck are involved in an accident and crash into each other.

JE

Jardel E.

Physics 101 Mechanics

2 years, 3 months ago

A car and a dump truck are involved in an accident and crash into each other. Assuming the only force acting is the force of collision, which one experiences the most force during the crash - the car or the dump truck?

CG

Criselle G.

Physics 101 Mechanics

2 years, 3 months ago

Cheetahs the fastest of great cats can reach 45mph in 2.0s starting from rest. Assuming that they have constant acceleration throughout that time, find a) their acceleration in ft/s^2 and m/s^2 b)the distance in m and ft they traveled during this time.
CG

Criselle G.

Physics 101 Mechanics

2 years, 3 months ago

A car sitting at a red light begins to accelerate at 2.0 m/s2 when the light turns green. It continues with this acceleration until it reaches a speed of 20 m/s. It then travels at this speed for another few minutes. How far does the car travel in the first 46 s after the light changes to green? 1
CG

Criselle G.

Physics 101 Mechanics

2 years, 3 months ago

you and your family take a trip to see your aunt who lives 100 miles away along a straight highway. the first 60 miles of the trip are driven at 55 mi/h but then you get stuck in a standstill traffic jam for 20 minutes. in order to make up time, you then proceed at 75 mi/h for the rest of the trip. what is the magnitude of your average velocity for the whole trip?
CG

Criselle G.

Physics 101 Mechanics

2 years, 3 months ago

that you drop a marble from the top of the burj khalifa building in dubai, … ... of the burj khalifa building in dubai, which is about 830 m tall.
CG

Criselle G.

Physics 101 Mechanics

2 years, 3 months ago

If a car moving at 80mph takes 400ft to stop with uniform acceleration after its brakes are applied
CG

Criselle G.

Physics 101 Mechanics

2 years, 3 months ago

an object start from rest and accelerates uniformly. if it moves 2m during first second. then during the first 3 seconds it will move how many meters
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

If the coefficient of kinetic friction between a 31.7-kg crate and the floor is 0.26, what horizontal force is required to move the crate at a steady speed across the floor?
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

The coefficient of static friction between hard rubber and normal street pavement is about 0.90. On how steep a hill (maximum angle) can you leave a car parked?
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A car can decelerate at 2.85 without skidding when coming to rest on a level road. What would its deceleration be if the road is inclined at 9° and the car moves uphill? Assume the same static friction coefficient.
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

Two crates, of mass 65 kg and 125 kg, are in contact and at rest on a horizontal surface (see the fig. below). A 650-N force is exerted on the 65-kg crate. If the coefficient of kinetic friction is 0.18, calculate the acceleration of the system.
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A jet plane traveling 574.4 pulls out of a dive by moving in an arc of radius 3.8 km. What is the plane’s acceleration in g’s?
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A horizontal force of 447 N is exerted on a 2.6-kg ball as it rotates (at arm’s length) uniformly in a horizontal circle of radius 0.7 m. Calculate the speed of the ball.
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A 0.97-kg ball, attached to the end of a horizontal cord, is revolved in a circle of radius 0.88 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 72.9 N, what is the maximum speed the ball can have?
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

How large must be a coefficient of static friction between the tires and the road if a car is to round a level curve of radius 150.1 m at a speed of 76.7 km/h
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

In a “Rotor-ride” at a carnival, people rotate in a vertical cylindrically walled “room.” (see the fig. below) If the room radius is 5.3 m, and the rotation frequency 0.54 revolutions per second when the floor drops out, what minimum coefficient of static friction keeps the people from slipping down?

PA

Paul A.

Physics 101 Mechanics

2 years, 3 months ago

You are lowering two boxes, one on top of the other, down a ramp by pulling on a rope parallel to the surface of the ramp. Both blocks move with constant velocity of 15.0 [ ???? ???? ]. The coefficient of kinetic friction between the ramp and the lower box is 0.444 and the coefficient of static friction between the two boxes is 0.800. Determine the angle at which the top block will start to slide down the bottom block.

MT

Melody T.

Physics 101 Mechanics

2 years, 3 months ago

A GPS tracking device is placed in a police dog to monitor its whereabouts relative to the police station. At time t1 = 23 min, the dog's displacement from the station is 1.2 km, 33° north of east. At time t2 = 57 min, the dog's displacement from the station is 2.0 km, 75° north of east. Find the magnitude and direction of the dog's average velocity between these two times.
VS

Vedsnau S.

Physics 101 Mechanics

2 years, 3 months ago

A uniform line charge of ?L = 3.30 nC/m is located at x = 3m, ? = 4 m. A point charge Q is 2m from the origin. Find the charge Q and its location such that the electric field is zero at the origin.
VS

Vedsnau S.

Physics 101 Mechanics

2 years, 3 months ago

Two infinite sheets of uniform charge densities ?s = 10-9/(6?) C/m2 are located at z = -5 m and y = -5 m. determine the uniform line charge density necessary to produce same value of E at (4, 2, 2) m if the line charge is at y = 0 and z = 0
TJ

Tammy J.

Physics 101 Mechanics

2 years, 3 months ago

A 10-minute exposure to 120 dB sound typically shifts your threshold of hearing temporarily from 0 dB up to 28 dB. Studies have shown that, on average, 10 years of exposure to 92 dB sound causes a permanent shift of up to 28 dB. What intensities correspond to 28 dB and 92 dB?
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

A bicycle tire is spinning counterclockwise at 2.20 rad/s. During a time period ?t = 1.40 s, the tire is stopped and spun in the opposite (clockwise) direction, also at 2.20 rad/s. Calculate the change in the tire's angular velocity ?? and the tire's average angular acceleration ?av. (Indicate the direction with the signs of your answers.)
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

A centrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. When switched off, it rotates through 48.0 revolutions before coming to rest. Find the constant angular acceleration (in rad/s2) of the centrifuge.
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

The tires on a new compact car have a diameter of 2.0 ft and are warranted for 56,000 miles.
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

A potter's wheel moves uniformly from rest to an angular speed of 0.21 rev/s in 34.0 s
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

In a recent test of its braking system, a Volkswagen Passat traveling at 23.2 m/s came to a full stop after an average negative acceleration of magnitude 2.00 m/s2.
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

a car traveling at 23.2 m/s came to a full stop after an average negative acceleration of magnitude 2.00 m/s2.
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

In a recent test of its braking system, a Volkswagen Passat traveling at 23.2 m/s came to a full stop after an average negative acceleration of magnitude 2.00 m/s2.
AK

Alexandra K.

Physics 101 Mechanics

2 years, 3 months ago

What is the average speed of 70km/h and 90km/h?
Cl

Carl L.

Physics 101 Mechanics

2 years, 3 months ago

A 14.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given instant. What is the acceleration of the bucket? Is it up or down?
Cl

Carl L.

Physics 101 Mechanics

2 years, 3 months ago

A box weighing 77.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end (Fig. 4–45). Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs (a) 30.0 N, (b) 60.0 N, and (c) 90.0 N.
Cl

Carl L.

Physics 101 Mechanics

2 years, 3 months ago

If the coefficient of kinetic friction between a 22-kg crate and the floor is 0.30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force ?k is required if is zero?
Cl

Carl L.

Physics 101 Mechanics

2 years, 3 months ago

A 25.0-kg box is released on a 27° incline and accelerates down the incline at 0.30 m/s2.Find the friction force impeding its motion. What is the coefficient of kinetic friction?
MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.707 A) sin [(314 Hz)t ]. a. What is the frequency of the alternating current
MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

The figure shows variation of the current through the heating element with time in an iron when it is plugged into a standard 120 V,
MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

what is magnetic field
MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

cos cos(sechx)

MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

y=arcCos(Sechx) cos(sechx)

DM

Donald M.

Physics 101 Mechanics

2 years, 3 months ago

My question is based off of "Pumpkin Toss In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground (Figure 4-21 ). Suppose that the tower is 9.0 m high and that the bull’s-eye is a horizontal distance of 3.5 m from the launch point. If the pumpkin is thrown horizontally, what is the launch speed needed to hit the bull’s-eye?" So, my question is "If, in the previous problem, a jack-o-launtern is given an initial horizontal speed of 3.3m/s, what are the direction and magnitude of its velocity (a) .75 seconds later and (b) just before it lands?"
DM

Donald M.

Physics 101 Mechanics

2 years, 3 months ago

A cork shoots out of a champagne bottle at an angle of 35 degrees above the horizontal. If the cork travels a horizontal distance of 1.3 meters in 1.25 seconds, what is the initial speed?

DM

Donald M.

Physics 101 Mechanics

2 years, 3 months ago

My question is based off of "In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 16 m/s at an angle of 37° above the horizontal. (a) What amount of time is required for the ball to reach the wall if it is 3.3 m away? (b) How high is the ball when it hits the wall?" So, my question is "(a) what are the magnitude and direction of the ball's velocity when it strikes the wall? (b) Has the ball reached the highest point of its trajectory at this time? Explain."
DM

Donald M.

Physics 101 Mechanics

2 years, 3 months ago

Babe Didrickson holds the world record for the world's longest ball throw (296 ft) by a woman. For the following questions, assume the ball was thrown at an angle of 45 degrees above the horizontal, that it traveled distance of 296 feet, and that it was caught at the same level from which it was thrown. (a) What's the balls initial speed? (b) How long was the ball in the air?
hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

A stone is thrown vertically upward at a speed of 19 m/s. How fast is this stone moving when it reaches a height of 13 m?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

A falling stone takes 0.31 s to travel past a window 2.2 m tall. From what height above the top of the window did the stone fall?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

A rocket rises vertically, from rest, with an acceleration of 3.2 m/s2 until it runs out of fuel at an altitude of 775 m. What is the velocity of the rocket when it runs out of fuel?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

A rocket rises vertically, from rest, with an acceleration of 3.2 m/s2 until it runs out of fuel at an altitude of 775 m. At what height above the ground is the rocket when 25 seconds have passed since its launch?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

You are arguing over a cell phone while trailing an unmarked police car by 25 m; both your car and the police car are traveling at 110 km/h. Your argument diverts your attention from the police car for 2.0 s At the beginning of that 2.0 s, the police officer begins braking suddenly at 5.0 m/s2. What is the separation between the two cars when your attention finally returns? When your attention returns, you also brake at 5.0 m/s2. What is your speed when you hit the police car?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

A red car and green car move toward each other in adjacent lanes and parallel to an x-axis At time t = 0, the red car is at xr = 0 and the green car is at xg = 220 m If the red car travels at a constant velocity of 20 km/h, the cars will pass each other at x = 44.5 m If the red car travels at a constant velocity of 40 km/h, the cars will pass each other at x = 76.6 m In both scenarios, the green car starts out with the same initial velocity and maintains the same constant acceleration. What is the initial velocity of the green car? What is the acceleration of the green car?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

A red car and green car move toward each other in adjacent lanes and parallel to an x-axis At time t = 0, the red car is at xr = 0 and the green car is at xg = 220 m If the red car travels at a constant velocity of 20 km/h, the cars will pass each other at x = 44.5 m If the red car travels at a constant velocity of 40 km/h, the cars will pass each other at x = 76.6 m In both scenarios, the green car starts out with the same initial velocity and maintains the same constant acceleration. What is the initial velocity of the green car? What is the acceleration of the green car?

hh

Hhh H.

Physics 101 Mechanics

2 years, 3 months ago

At highway speeds, a particular automobile is capable of an acceleration of about 4 m/s2. At this rate, how long does it take to accelerate from 55 km/h to 119 km/h?

td

Trish D.

Physics 101 Mechanics

2 years, 3 months ago

A block with a mass of 3.1 kg is placed at rest on a surface inclined at an angle of 45° above the horizontal. The coefficient of static friction between the block and the surface is 0.50, and a force of magnitude F pushes upward on the block, parallel to the inclined surface. (a) The block will remain at rest only if F is greater than a minimum value, and less than a maximum value, Explain the reasons for this behavior. (b) Calculate F min (c) Calculate F max

MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

the figure shows variation of the current through the heating element with times in an iron when it is plugged into a standard 120V, 60Hz outlet (a) what is the peak voltage (b) what is the rms value of a current in the circuit cos(sechx)

AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

a projectile is launched and landed 5.00 s later, 100 m away on the ground from initial point.Find the initial speed and direction
AU

Ahmad U.

Physics 101 Mechanics

2 years, 3 months ago

a projectile is launched and landed 5.00 s later, 100 m away on the ground from initial point.Find the initial speed and direction
MA

Mudau A.

Physics 101 Mechanics

2 years, 3 months ago

five resistors are connected in a circut use kirchhoff rule to calculate R2

NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

How far from the base of the rock will she land?
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

A diver running 2.5 m/s dives out horizontally from the edge of a vertical cliff and 3.1 s later reaches the water below.
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

A ball is thrown horizontally from the roof of a building 7.4 m tall and lands 9.3 m from the base.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A physics student rolls a ball down a hill with an initial velocity of 2.5 m/s. If it accelerates down the hill at a rate of 6.3 m/s2 , how long will it take to reach the bottom of the hill, 150 meters away?

NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

A ball thrown horizontally at 13.0 m/s from the roof of a building lands 20.4 m from the base of the building.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A car starts from rest and accelerates for 5.3 s at 2.9 m/s2 . The driver then applies the brakes, causing the car to decelerate at –3.6 m/s2 . (a) How fast is the car going after 4.1 s of braking? (b) How far has the car traveled from its start?

PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A 75-m long train begins uniform acceleration from rest. The front of the train has a speed of 18 m/s when it passes a railway worker who is standing 180 m from where the front of the train started. What will be the speed of the last car as it passes the worker?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A 75-m long train begins uniform acceleration from rest. The front of the train has a speed of 18 m/s when it passes a railway worker who is standing 180 m from where the front of the train started. What will be the speed of the last car as it passes the worker?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A physics student rolls a ball down a hill with an initial velocity of 2.5 m/s. If it accelerates down the hill at a rate of 6.3 m/s2 , how long will it take to reach the bottom of the hill, 150 meters away?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A car starts from rest and accelerates for 5.3 s at 2.9 m/s2 . The driver then applies the brakes, causing the car to decelerate at –3.6 m/s2 . (a) How fast is the car going after 4.1 s of braking? (b) How far has the car traveled from its start?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A physics student rolls a ball down a hill with an initial velocity of 2.5 m/s. If it accelerates down the hill at a rate of 6.3 m/s2 , how long will it take to reach the bottom of the hill, 150 meters away?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A 75-m long train begins uniform acceleration from rest. The front of the train has a speed of 18 m/s when it passes a railway worker who is standing 180 m from where the front of the train started. What will be the speed of the last car as it passes the worker?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A bus is traveling south at 30 mph. A passenger throws a ball with a speed of 42 mph towards the back of the bus. (a) Find the velocity of the ball with respect to the street. (b) If the bus speeds up to 45 mph and the passenger throws another 42 mph ball towards the back of the bus, find the ball’s velocity relative to the street.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A man drives 62 km due North at 70 km/h. Then he turns right and travels 21 km toward the East at 80 km/h. (a) Find his average speed. (b) Find his average velocity.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

Find the resultant by adding these two vectors. ? A = 47 cm at 20°, and ? B =36 cm at 75°.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A 2017 Ford F-150 and a 2012 Chevy S-10 approach each other with a relative velocity of 135 mph. If the Ford is going 23% faster than the Chevy, what is the Ford’s velocity relative to the road?
JM

Jj M.

Physics 101 Mechanics

2 years, 3 months ago

How much work must a person do to burn off the calories in a 750 calorie Big Mac
JM

Jj M.

Physics 101 Mechanics

2 years, 3 months ago

How much work must a person do to burn off the calories in a 750 calorie Big Mac
JM

Jj M.

Physics 101 Mechanics

2 years, 3 months ago

one end of a 56 cm long copper rod with a diameter of 2 cm is kept at 460C, and the other is immersed water at 22 C. Calculate the heat conduction rate along the pool
JM

Jj M.

Physics 101 Mechanics

2 years, 3 months ago

one end of a 56 cm long copper rod with a diameter of 2 cm is kept at 460C, and the other is immersed water at 22 C. Calculate the heat conduction rate along the pool
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

A football is kicked at ground level with a speed of 18.1 m/s at an angle of 33.5 ? to the horizontal.
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

Extreme-sports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910 m in Yosemite National Park. Assume a jumper runs horizontally off the top of El Capitan with speed 4.0 m/s and enjoys a free fall until she is h = 170 m above the valley floor, at which time she opens her parachute.
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

A projectile is fired with an initial speed of 36.0 m/s at an angle of 41.0 ? above the horizontal on a long flat firing range.
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

Determine the maximum height reached by the projectile. Determine the total time in the air.
NN

Noah N.

Physics 101 Mechanics

2 years, 3 months ago

A projectile is fired with an initial speed of 36.6 m/s at an angle of 42.2 above the horizontal on a long flat firing range. Determine () the maximum height reached by the projectile, () the total time in the air, () the total horizontal distance covered (that is, the range), and () the speed of the projectile 1.50 s after firing.

TA

Tiayooluwa A.

Physics 101 Mechanics

2 years, 3 months ago

Imagine holding a small 2 N banana at rest. What is the net force on this banana? If you release the banana and let it drop, what's the net force on the banana as it is falling?
TA

Tiayooluwa A.

Physics 101 Mechanics

2 years, 3 months ago

You need to move a heavy box that has a mass of 50 kg. How much force must you apply to accelerate the box at 0.5 m/s/s?
TA

Tiayooluwa A.

Physics 101 Mechanics

2 years, 3 months ago

You need to move a heavy box that has a mass of 50 kg. How much force must you apply to accelerate the box at 0.5 m/s/s?
RS

Ray S.

Physics 101 Mechanics

2 years, 3 months ago

A package is dropped from an air balloon two times. In the first trial the distance between the balloon and the surface is H and in the second trial 4H. Compare the FINAL VELOCITY'S for the packages right as they hit the ground (or right before)?
KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

7. A surveyor measures the distance across a straight river by the following method (Fig. P3.7). Starting directly across from a tree on the opposite bank, she walks d 5 100 m along the riverbank to establish a baseline.Then she sights across to the tree. The angle from her baseline to the tree is u 5 35.0°. How wide is the river?

JF

Jillian F.

Physics 101 Mechanics

2 years, 3 months ago

A 20.0 kg box rest on a table
JF

Jillian F.

Physics 101 Mechanics

2 years, 3 months ago

A 0.140-kg baseball traveling 35.0 m/s
KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

8. Vector A ? has a magnitude of 29 units and points in the positive y direction. When vector B ? is added to A ?, the resultant vector A ? + B ? points in the negative y direction with a magnitude of 14 units. Find the magnitude and direction of B ?.
JF

Jillian F.

Physics 101 Mechanics

2 years, 3 months ago

An elevator mass 4850 kg is to be designed
KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

11. The displacement vectors A ? and B ? shown in Figure P3.11 both have magnitudes of 3.00 m. The direction of vector A ? is ? 5 30.0°. Find graphically (a) A ? + B ?, (b) A ? - B ? ,(c) B ? - A , and (d) A ? - 2 B ? .(Report all angles counterclockwise from the positive x axis.)
KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

14. A plane flies from base camp to Lake A, 280 km away in the direction 20.0° north of east. After dropping off supplies, it flies to Lake B, which is 190 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp.
JF

Jillian F.

Physics 101 Mechanics

2 years, 3 months ago

what is the acceleration of two falling sky divers when the upward force of air resistance
KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

15. A vector has an x component of 225.0 units and a y component of 40.0 units. Find the magnitude and direction of this vector.

KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

15. A vector has an x component of 225.0 units and a y component of 40.0 units. Find the magnitude and direction of this vector.

KS

Kei S.

Physics 101 Mechanics

2 years, 3 months ago

6. In Fig. 3-27, a heavy piece of machinery is raised by sliding it a distance d = 12.5 m along a plank oriented at angle ?= 20.0° to the horizontal. How far is it moved (a) vertically and (b) horizontally?
MG

Mac G.

Physics 101 Mechanics

2 years, 3 months ago

Does parallax error affect the precision of a measurement that you make? Why?

AT

Allan T.

Physics 101 Mechanics

2 years, 3 months ago

Are discussion questions of University book 14th edition also solved in this website?
MR

Mia R.

Physics 101 Mechanics

2 years, 3 months ago

a ball player catches a ball 3.4s after throwing it vertically upward. With what speed did he throw it, and what height did it reach?
Ac

Autumn C.

Physics 101 Mechanics

2 years, 3 months ago

I am a bit confused with the methods of uncertainty processing...Which one shall I use if I want to calculate the absolute uncertainty for g in a pendulum experiment? (?T/T)*2+(?L/L)=(?g/g) or (?g/g)=4pi^2*?(?T/T)^2*2+(?L/L)^2 and how do I calculate it? g=(4pi^2*L)/T^2 Given that my time is 1.407+-0.014s, length is 49+-0.05cm.
MR

Mia R.

Physics 101 Mechanics

2 years, 3 months ago

a baseball is hit straight up into the air with a speed of 25 m/s. estimate (a) how high it goes
JW

Jason W.

Physics 101 Mechanics

2 years, 3 months ago

To sterilize a 50.0-g glass baby bottle, we must raise its temperature from to . How much heat transfer is required?
JW

Jason W.

Physics 101 Mechanics

2 years, 3 months ago

A 0.250-kg block of a pure material is heated from to by the addition of 4.35 kJ of energy. Calculate its specific heat and identify the substance of which it is most likely composed.
JW

Jason W.

Physics 101 Mechanics

2 years, 3 months ago

a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.

yg

Yuval G.

Physics 101 Mechanics

2 years, 3 months ago

four vectors all have the same magnitude the angle between adjacent vectors is 45
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

Determine the stopping distances for an automobile going a constant initial speed of 95 km/h and human reaction time of 0.40 s: (a) for an acceleration a = –3.0 m/s2 ; (b) for a = –6.0 m/s2
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A water rocket starts from rest and rises straight up with an acceleration of 7.85 m/s2 until it runs out of water 2.44 s later. If it continues to rise until its speed is zero, what will be its maximum height?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A rock is thrown with an initial velocity of 15 m/s straight down from a tree house that is 36 m above the ground. How long does it take for the rock to reach the ground?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A model rocket is launched straight upward with an initial speed of 24 m/s. It accelerates with a constant upward acceleration of 3.7 m/s2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket?
AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

If you want to double the momentum of a gas molecule, by what factor must you increase its kinetic energy

AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion:I. The total momentum of the fragments is equal to the original momentum of the firecracker.II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.
AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

A 1200-kg car moving at suddenly collides with a stationary car of mass If the two vehicles lock together, what is their combined velocity immediately after the collision?
AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

A block of mass m = 4.4 kg, moving on frictionless surface with a speedvi= 9.2 m/s, makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 4.4-kg block recoils with a speed ofvf = 2.5 m/s. What is the mass Mof the second block?
GA

Godswill A.

Physics 101 Mechanics

2 years, 3 months ago

A flea jumps straight up to a maximum height of 0.460 m . What is its initial velocity v0 as it leaves the ground?
AM

Allison M.

Physics 101 Mechanics

2 years, 3 months ago

A block of mass m = 3.6 kg, moving on a frictionless surface with a speedvi= 9.3 m/s, makes a sudden perfectly elastic collision with a stationary block of mass M, as shown in the figure. Just after the collision, the 3.6-kg block recoils with a speed ofvf= 9.2 m/s. What is the speed V of the other block?
GA

Godswill A.

Physics 101 Mechanics

2 years, 3 months ago

A cannonball is fired horizontally from the top of a cliff. The cannon is at height H = 100 m above ground level, and the ball is fired with initial horizontal speed v0. Assume acceleration due to gravity to be g = 9.80 m/s2 Assume that the cannon is fired at time t=0 and that the cannonball hits the ground at time tg. What is the y position of the cannonball at the time tg/2
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A physics student throws a softball straight up into the air. It comes back down and he catches it 3.56 s after it was thrown. (a) With what speed was it thrown? (b) How high did it rise?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A model rocket is launched straight upward with an initial speed of 24 m/s. It accelerates with a constant upward acceleration of 3.7 m/s2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A race car driver must average 200.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 199.0 km/h, what average speed must be maintained for the last lap?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A bowling ball traveling with a constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.50 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

An airplane travels 2100 km at a speed of 800 km/h, and then encounters a tailwind that boosts its speed to 1000 km/h for the next 1800 km. What was the average speed of the plane for this trip?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A man drives due south for 1 h 18 min at 55 mph. Then he turns right and travels for 44 min toward the west at 65 mph. (a) Find his average speed. (b) Find his average velocity.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A car travels at 43 km/h for 2.1 h and then at 62 km/h for 3.3 h. (a) What is the total distance the car traveled? (b) What is its average speed?.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A man drives 62 km due North at 70 km/h. Then he turns right and travels 21 km toward the East at 80 km/h. (a) Find his average speed. (b) Find his average velocity.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A physics student throws a softball straight up into the air. It comes back down and he catches it 3.56 s after it was thrown. (a) With what speed was it thrown? (b) How high did it rise?
GA

Godswill A.

Physics 101 Mechanics

2 years, 3 months ago

At what speed v should an archerfish spit the water to shoot down an insect floating on the water surface located at a distance 0.800 m from the fish? Assume that the fish is located very close to the surface of the pond and spits the water at an angle 60? above the water surface.

GA

Godswill A.

Physics 101 Mechanics

2 years, 3 months ago

A 124-kg balloon carrying a 22-kg basket is descending with a constant downward velocity of 24.7 m/s A 1.0-kg stone is thrown from the basket with an initial velocity of 15.7 m/s perpendicular to the path of the descending balloon, as measured relative to a person at rest in the basket. The person in the basket sees the stone hit the ground 5.10 s after being thrown. Assume that the balloon continues its downward descent with the same constant speed of 24.7 m/s .
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A physics student throws a softball straight up into the air. It comes back down and he catches it 3.56 s after it was thrown. (a) With what speed was it thrown? (b) How high did it rise?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

A water rocket starts from rest and rises straight up with an acceleration of 7.85 m/s2 until it runs out of water 2.44 s later. If it continues to rise until its speed is zero, what will be its maximum height?
GA

Godswill A.

Physics 101 Mechanics

2 years, 3 months ago

An arrow is shot at an angle of ?=45? above the horizontal. The arrow hits a tree a horizontal distance D=220m away, at the same height above the ground as it was shot. Use g=9.8m/s2 for the magnitude of the acceleration due to gravity.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

The SI (metric system) standard of mass is the kilogram. It is defined by the mass of a cylinder made of a platinum-iridium alloy kept at the International Bureau of Weights and Measures, located in Paris, France. The cylinder is 3.9 cm high and 3.9 cm in diameter. Calculate the density of this cylinder in g/cm3
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

How many liters are contained in a rectangular aquarium tank that is 1.25 m wide, 2.05 m long, and 47.0 cm deep?
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

Calculate the diameter of a 7.26 kg shot put ball that is made of cast iron. The density of cast iron is 7.87 g/cm3
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

Find the resultant displacement of a hiker that heads 65° north of west for 3.5 km, then turns and heads west for 2.5 km.
PH

Paris H.

Physics 101 Mechanics

2 years, 3 months ago

Find the resultant by adding these two vectors. ? A = 47 cm at 20°, and ? B =36 cm at 75°.
EM

Edwin M.

Physics 101 Mechanics

2 years, 3 months ago

In a house the temperature at the surface of a window is 25 C. The temperature outside at the window surface is 5.0 C. Heat is lost through the window via conduction, and the heat lost per second has a certain value. The temperature outside begins to fall, while the conditions inside the house remain the same. As a result, the heat lost per second increases. What is the temperature at the outside window surface when the heat lost per second doubles?
EM

Edwin M.

Physics 101 Mechanics

2 years, 3 months ago

Two cylindrical rods are identical, except that one has a thermal conductivity k1 and the other has a thermal conductivity k2. As the drawing shows, they are placed between two walls that are maintained at different temperatures TW (warmer) and TC (cooler). When the rods are arranged as in part a of the drawing, a total heat Q flows from the warmer to the cooler wall, but when the rods are arranged as in part b, the total heat flow is Q. Assuming that the conductivity k2 is twice as great as k1 and that heat flows only along the lengths of the rods, determine the ratio Q/Q.
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

What is the magnitude of the acceleration of a speck of clay on the edge of a potter’s wheel turning at 43.2 rpm (revolutions per minute) if the wheel’s diameter is 60 cm?
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A coin is placed 30 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 44.1 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?
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A 1562.4-kg sports car (including driver) crosses the rounded top of a hill (radius = 99.14 m) at 19.03 m/s. Determine (a) the normal force exerted by the road on the car.
EM

Edwin M.

Physics 101 Mechanics

2 years, 3 months ago

In an aluminum pot, 0.15 kg of water at 100 C boils away in four minutes. The bottom of the pot is 3.1  103 m thick and has a surface area of 0.015 m2. To prevent the water from boiling too rapidly, a stainless steel plate has been placed between the pot and the heating element. The plate is 1.4  103 m thick, and its area matches that of the pot. Assuming that heat is conducted into the water only through the bottom of the pot, find the temperature at (a) the aluminum–steel interface and (b) the steel surface in contact with the heating element.
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

A bucket of mass 1.95 kg is whirled in a vertical circle of radius 1.62 m. At the lowest point of its motion the tension in the rope supporting the bucket is 29.4 N. (a) Find the speed of the bucket.
JM

Jj M.

Physics 101 Mechanics

2 years, 3 months ago

a .400kg iron horseshoes is very hot and is dropped into 1.25 l of water in a .300 kg iron pot initially at 20 C. If the finally equilibrium temperature is 25 C, calculate the initial temperature of the hot horseshoe
EM

Edwin M.

Physics 101 Mechanics

2 years, 3 months ago

Light bulb 1 operates with a filament temperature of 2700 K, whereas light bulb 2 has a filament temperature of 2100 K. Both filaments have the same emissivity, and both bulbs radiate the same power. Find the ratio A1/A2 of the filament areas of the bulbs.
VS

Victoria S.

Physics 101 Mechanics

2 years, 3 months ago

Calculate the force of Earth’s gravity on a spacecraft 5.4 Earth radii above the Earth’s surface if its mass is 1336.27 kg.
JM

Jj M.

Physics 101 Mechanics

2 years, 3 months ago

Ice at 0 C is placed in a container with an equal mass of water. What minimum temperature must the water be at to completely melt the ice
Ly

Lai Y.

Physics 101 Mechanics

2 years, 3 months ago

How much energy is released when H 31H decays through ?-emission?
KD

Khoa D.

Physics 101 Mechanics

2 years, 3 months ago

A pencil is dropped, point down, into water. If the pencil is released from a height of 0.04 m (measured from the point to the water level), how far will it dive? Treat the pencil as a cylinder of radius 0.40 cm, length 20 cm, and mass 4.0 gm. Ignore the frictional and inertial resistance of the water, but take into account the buoyant force. Use a free-body diagram, make use of Newton's 2nd Law and write the acceleration in the form a= v(dv/dy)
FD

Fantastik D.

Physics 101 Mechanics

2 years, 3 months ago

A 30-lb block on a level frictionless surface is attached by a cord passing over a small frictionless pulley to a hanging block originally at rest 4 ft above the floor. The hanging block strikes the floor in 2 seconds. Find a) the weight of the hanging block b) the tension in the string while the blocks are in motion.
FD

Fantastik D.

Physics 101 Mechanics

2 years, 3 months ago

A 28 kg box slides along a frictionless table. It is attached to a 0.2 kg box by a light string. Find the time it takes for the 0.2 kg box to fall 2 m to the floor if the system starts from rest.
BP

Bradie P.

Physics 101 Mechanics

2 years, 3 months ago

AnidealgasiscompressedfromavolumeofVi =5.00LtoavolumeofVf =3.00L while in thermal contact with a heat reservoir at T = 295 K as in the Figure below. During the compression process, the piston moves down a distance of d = 0.130 m under the action of an average external force of F=25.0 kN. Find
BP

Bradie P.

Physics 101 Mechanics

2 years, 3 months ago

An ideal monatomic gas is contained in a vessel of constant volume 0.200 m . The initial temperature and pressure of the gas are 300. K and 5.00 atm, respectively. The goal of this problem is to find the temperature and pressure of the gas after 16.0 kJ of thermal energy is supplied to the gas.
AP

Andrew P.

Physics 101 Mechanics

2 years, 3 months ago

How much work does it do on each proton?
JC

Jared C.

Physics 101 Mechanics

2 years, 3 months ago

A race car with four wheels begins at rest at the top of a ramp of height h , as shown above. The body of the car has a mass m and has four wheels, each of which has radius r and mass m/4 . We can treat the wheels as discs. ( I MR about it’s center, where is the radius of disc = 2 1 2 R the disk and M is the mass.) We then release the car from rest, and it proceeds to roll down the ramp without slipping. Write all solutions in terms of fundamental constants and the given quantities.
AP

Andrew P.

Physics 101 Mechanics

2 years, 3 months ago

Express 2000 kcal/day in watts.
1 2 3 4 5 ... 21407

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