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Physics 101 Mechanics Q&A Archive of October 22, 2021

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October 22 of 2021

A 500 N force at angle 15degree with horizontal, is used to push a 40kg box up an inclined plane at a constant speed. determine the magnitude of the normal force, F, and the conefficient of kinetic friction, Uk
Un bloque se está moviendo a 20cm/s y no se ejercen fuerzas sobre él. ¿Cuál será su velocidad después de 5 segundos?
Many times, despite the fact that the driver is stepping on the accelerator, the car moves in a straight line with constant speed. What can be said about the result of the forces acting on the car?
Plot time variation of displacement, velocity, acceleration of a spring mass damping system, with m=450kg, k=26519.2, c=1000, Xo=0.539657, Vo=1, using MATLAB.
An iron worker drops a hammer 5.25 m to the ground.
A pile driver falls a distance of 1.75 m before hitting a pile.
A crate of mass 475 kg is raised to a height 17.0 m
A bullet with mass 12.0 g travels 415 m/s
A wattmeter shows that a motor is drawing 2200 W.
How many seconds would it take a 7.00-hp
W=55.0 Jt=11.0 sP=?
P=231 ft lb/st=14.3 sW=?
A traveller is pulling a suitcase at an angle of 40.0
A mixing beater consists of three thin rods, each 10.6 cm long. The rods diverge from a central hub, separated from each other by 120°, and all turn in the same plane. A ball is attached to the end of each rod. Each ball has cross-sectional area 3.80 cm2 and is so shaped that it has a drag…
A block of mass m1 = 1.65 kg and a block of mass m2 = 5.75 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.250 m and mass M = 10.0 kg. The fixed, wedge-shaped ramp makes an angle of ???? = 30.0° as shown in the figure. The coefficient of…
A block is moving at 20cm/s and no forces are exerted on it. What will be the speed after 5 s?
A spool of thread consists of a cylinder of radius R1 = 5.2 cm with end caps of radius R2 = 11.1 cm as depicted in the end view shown in the figure below. The mass of the spool, including the thread, is m = 260 g. The spool is placed on a rough, horizontal surface so that it rolls without…
A massless tether with a masses tied to both ends rotates about a fixed axis through the centre. Can the total acceleration of the tether/mass combination be zero if the angular velocity is constant?
You have a pulley 10.0 cm in diameter and with a mass of 1.5 kg. You get to wondering whether the pulley is uniform. That is, is the mass evenly distributed, or is it concentrated toward the center or the rim? To find out, you hang the pulley on a hook, wrap a string around it several times,…
Unit of work and power
A spring of spring constant 5 ? 103 N/m is stretched initially by 5cm from the unstretched position. Then the work required to stretch it further by another 5cm is
When a spring is stretched by 2 cm, it stores 100 J of energy. If it is stretched further by 2 cm, the stored energy will be increased by
A spring when stretched by 2 mm its potential energy becomes 4 J. If it is stretched by 10 mm, its potential energy is equal to
A spring of force constant 800 N/m has an extension of 5cm. The work done in extending it from 5cm to 15 cm is
A ball of mass m moves with speed v and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is
If a force F = 4ˆi +5ˆj causes a displacement s =3ˆi + 6kˆ ? , work done is
Two springs of spring constants 1500 N/m and 3000 N/m respectively are stretched with the same force. They will have potential energy in the ratio
spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is
The force constant of a wire is k and that of another wire is 2k. When both the wires are stretched through same distance, then the work done
If force and displacement of particle in direction of force are doubled. Work would be
A body of mass 10kg at rest is acted upon simultaneously by two forces 4 N and 3N at right angles to each other. The kinetic energy of the body at the end of 10 sec
50kg man with 20kg load on his head climbs up 20 steps of 0.25m height each. The work done in climbing is
A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 0.8 J. What is the elongation of the spring if the spring constant is 100 N/m? A. 2 cm B. 4 cm C. 8 cm D. 10 cm E. 13 cm
A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force? A. 400 J B. -400 J C. zero D. 50 J E. -50J
A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 0.8 J. What is the elongation of the spring if the spring constant is 100 N/m? A. 2 cm B. 4 cm C. 8 cm D. 10 cm E. 13 cm
A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force? A. 400 J B. -400 J C. zero D. 50 J E. -50J
. A car travels with a constant speed of 15 m/s. The car’s engine produces a 4000 N pushing force in order to keep the speed constant. How much power is developed by the engine?
What happens to the total energy of a moving object if all the applied forces are conserved? A. It increases B. It decreases C. It remains constant D. The velocity is required to answer this question E. The altitude is required to answer this question
force of (3ˆi + 4 ˆj) Newton acts on a body and displaces it by (3ˆi + 4ˆj)m. The work done by the force is [AIIMS 2001] (a) 10 J (b) 12 J (c) 16 J (d) 25 J
Two bodies of mass m1 and m2 have equal kinetic energies.What is the ratio of their linear momentum
A train is moving in the west direction with a velocity 15m/s.A monkey runs on the roof of the train against its motion with a velocity 5m/s with respect to train .Take the motion along west as positive Velocity of train relative to Driver
A body of mass 1 kg is rotating in a circular path of radius 1 m with constant velocity of 5 rev/sec. The work done in one complete revolution is
A truck and car are moving with same Kinetic energies on a straight road.Their engines are simuktanously switched off .Which one will stop at a lesser distance a. Truck b. Car c. Both will stop at the same distance d. Cannot say with the given data
A kangaroo is capable of jumping to a height of 2.62 m. Determine the takeoff speed of the kangaroo
A train is moving in the west direction with a velocity 15m/s.A monkey runs on the roof of the train against its motion with a velocity 5m/s with respect to train .Take the motion along west as positive Velocity of train relative to monkey
A loaf of Bread gives a boy of mass 40kg an energy of 21kJ. If the efficiency is 28% then the height can be climbed by him using this energy is
A mass of 2 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute, its kinetic energy would be
A machine does 2500 J of work in 1 min. What is the power developed by the machine? A. 21 W B. 42 W C. 150 W D. 2500 W E. 150000 W
A motorbike engine can develop a power of 90000 W in order to keep a constant velocity of 30 m/s. What is the pushing force? A. 3000 N B. 30000 N C. 300000 N D. 300 N E. 30 N
A block of mass m = 50 kg moves on a rough horizontal surface with a coefficient of kinetic friction µ = 0.5. The traveled distance is 20 m. How much work is done by the friction force?
A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the acceleration of the bike.
Which one of the following statement(s) is true? a.A body moving with uniform speed can have variable velocity b.A body moving with uniform velocity can have variable speed c.Average velocity is always equal to instantaneous velocity d.x-t graph can be a straight line parallel to position…
A race car accelerates uniformly from 18 m/s to 46 m/s in 2 seconds. Determine the acceleration of the car and the distance traveled.
Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.60 seconds, what will be his final velocity and how far will he fall?
A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.
A Balloon rises from rest on the ground vertically upwards with a constant acceleration g/8.An object is dropped from the balloon when it has risen to the height h.Find out the time taken by the object to reach the ground.
A bus start at Station A from rest with uniform acceleration 2m/sec2.Bus moves along a straight line b. At what time, it velocity becomes 20m/sec?
A bus start at Station A from rest with uniform acceleration 2m/sec2.Bus moves along a straight line a. Find the distance moved by the bus in 10 sec?
A planet orbits a star once every 3.41 107 s in a nearly circular orbit of radius 1.44 1011 m.
An average brain has a mass of 1.3 kg. It takes a force of roughly 120 N to cause a concussion. If you get into a car accident driving at 18 m/s (roughly 40 mph) where your head (with your brain inside it) comes to a complete stop in 0.15 seconds are you likely to walk away with a…
an attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s from a height of 1.55 m above the ground. (a) will the rock reach the top of the wall? (b) if so, what is its speed at the top? if not, what initial speed must it have to reach the top?
which one correct answer
are the two system shown the figure is equivulent? justify
1hr
Where can i find the solution to Theresa B's question ? https://www.numerade.com/ask/question/in-a-compton-effect-experiment-the-scattered-light-quantum-is-observed-at-an-angle-of-60circ-to-the--94553/
THE UNIFORM BAR SHOWN IN THE FIGURE WEIGHS AON AND SURECTED TO THE ONCES SHOWN FIND THE MAGNITUDE SOCATION AND DIRECTION OF THE FORCE NEEDED TO KEEP THE BAR IN EQUILIBRIUM
an x-ray with a frequency of 3.3530 x 10^19 hz strikes a metal foil and the scattered photon is detected at an angle of 32.300 degrees relative to the direction of the original x-ray.
10 J of energy is transferred from system 1 to system 2 without changing their temperature. What can we say about their entropies?
May I know the solution for (f)
1. A ball is thrown upward with an initial velocity of 10 m/s a. How high does the ball rise? b. What is the total time of the flight?
Four identical spheres of masses 2.0 kg each and radius 0.25 m are situated at the four corners of a square. One side of the square measures 3.00 m. Find the moment of inertia about an axis (a) passing through the center of the square and perpendicular to its plane, (b) passing through one of…
determine the angle of twist of wheel b with respect to wheel a the shaft has a diameter of 40mm and is made of 36-steel
determine the angle of twist of wheel b with respect to wheel a
WORKSHEETI DIRECTICNS: ALL WORK MUST BE ILANDWRIIIEN_ 1. Draw the free body diagram for each problem. 2. Use the GUESS method to show your work. 1. Throe forces are being exerted on a common object. Two of the forces are acting downward with values of \( 20 \mathrm{~N} \) and \( 45 \mathrm{~N}…
A 500 N force at angle 15degree with horizontal, is used to push a 40kg box up an inclined plane at a constant speed. determine the magnitude of the normal force, F, and the conefficient of kinetic friction, Uk
Un bloque se está moviendo a 20cm/s y no se ejercen fuerzas sobre él. ¿Cuál será su velocidad después de 5 segundos?
Many times, despite the fact that the driver is stepping on the accelerator, the car moves in a straight line with constant speed. What can be said about the result of the forces acting on the car?
Plot time variation of displacement, velocity, acceleration of a spring mass damping system, with m=450kg, k=26519.2, c=1000, Xo=0.539657, Vo=1, using MATLAB.
An iron worker drops a hammer 5.25 m to the ground.
A pile driver falls a distance of 1.75 m before hitting a pile.
A crate of mass 475 kg is raised to a height 17.0 m
A bullet with mass 12.0 g travels 415 m/s
A wattmeter shows that a motor is drawing 2200 W.
How many seconds would it take a 7.00-hp
W=55.0 Jt=11.0 sP=?
P=231 ft lb/st=14.3 sW=?
A traveller is pulling a suitcase at an angle of 40.0
A block of mass m1 = 1.65 kg and a block of mass m2 = 5.75 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.250 m and mass M = 10.0 kg. The fixed, wedge-shaped ramp makes an angle of ???? = 30.0° as shown in the figure. The coefficient of…
A block is moving at 20cm/s and no forces are exerted on it. What will be the speed after 5 s?
A spool of thread consists of a cylinder of radius R1 = 5.2 cm with end caps of radius R2 = 11.1 cm as depicted in the end view shown in the figure below. The mass of the spool, including the thread, is m = 260 g. The spool is placed on a rough, horizontal surface so that it rolls without…
You have a pulley 10.0 cm in diameter and with a mass of 1.5 kg. You get to wondering whether the pulley is uniform. That is, is the mass evenly distributed, or is it concentrated toward the center or the rim? To find out, you hang the pulley on a hook, wrap a string around it several times,…
Unit of work and power
A spring of spring constant 5 ? 103 N/m is stretched initially by 5cm from the unstretched position. Then the work required to stretch it further by another 5cm is
When a spring is stretched by 2 cm, it stores 100 J of energy. If it is stretched further by 2 cm, the stored energy will be increased by
A spring when stretched by 2 mm its potential energy becomes 4 J. If it is stretched by 10 mm, its potential energy is equal to
A spring of force constant 800 N/m has an extension of 5cm. The work done in extending it from 5cm to 15 cm is
A ball of mass m moves with speed v and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is
If a force F = 4ˆi +5ˆj causes a displacement s =3ˆi + 6kˆ ? , work done is
Two springs of spring constants 1500 N/m and 3000 N/m respectively are stretched with the same force. They will have potential energy in the ratio
spring 40 mm long is stretched by the application of a force. If 10 N force required to stretch the spring through 1 mm, then work done in stretching the spring through 40 mm is
The force constant of a wire is k and that of another wire is 2k. When both the wires are stretched through same distance, then the work done
If force and displacement of particle in direction of force are doubled. Work would be
A body of mass 10kg at rest is acted upon simultaneously by two forces 4 N and 3N at right angles to each other. The kinetic energy of the body at the end of 10 sec
50kg man with 20kg load on his head climbs up 20 steps of 0.25m height each. The work done in climbing is
A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 0.8 J. What is the elongation of the spring if the spring constant is 100 N/m? A. 2 cm B. 4 cm C. 8 cm D. 10 cm E. 13 cm
A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force? A. 400 J B. -400 J C. zero D. 50 J E. -50J
A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 0.8 J. What is the elongation of the spring if the spring constant is 100 N/m? A. 2 cm B. 4 cm C. 8 cm D. 10 cm E. 13 cm
A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force? A. 400 J B. -400 J C. zero D. 50 J E. -50J
. A car travels with a constant speed of 15 m/s. The car’s engine produces a 4000 N pushing force in order to keep the speed constant. How much power is developed by the engine?
What happens to the total energy of a moving object if all the applied forces are conserved? A. It increases B. It decreases C. It remains constant D. The velocity is required to answer this question E. The altitude is required to answer this question
force of (3ˆi + 4 ˆj) Newton acts on a body and displaces it by (3ˆi + 4ˆj)m. The work done by the force is [AIIMS 2001] (a) 10 J (b) 12 J (c) 16 J (d) 25 J
Two bodies of mass m1 and m2 have equal kinetic energies.What is the ratio of their linear momentum
A train is moving in the west direction with a velocity 15m/s.A monkey runs on the roof of the train against its motion with a velocity 5m/s with respect to train .Take the motion along west as positive Velocity of train relative to Driver
A body of mass 1 kg is rotating in a circular path of radius 1 m with constant velocity of 5 rev/sec. The work done in one complete revolution is
A truck and car are moving with same Kinetic energies on a straight road.Their engines are simuktanously switched off .Which one will stop at a lesser distance a. Truck b. Car c. Both will stop at the same distance d. Cannot say with the given data
A kangaroo is capable of jumping to a height of 2.62 m. Determine the takeoff speed of the kangaroo
A train is moving in the west direction with a velocity 15m/s.A monkey runs on the roof of the train against its motion with a velocity 5m/s with respect to train .Take the motion along west as positive Velocity of train relative to monkey
A loaf of Bread gives a boy of mass 40kg an energy of 21kJ. If the efficiency is 28% then the height can be climbed by him using this energy is
A mass of 2 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute, its kinetic energy would be
A machine does 2500 J of work in 1 min. What is the power developed by the machine? A. 21 W B. 42 W C. 150 W D. 2500 W E. 150000 W
A motorbike engine can develop a power of 90000 W in order to keep a constant velocity of 30 m/s. What is the pushing force? A. 3000 N B. 30000 N C. 300000 N D. 300 N E. 30 N
A block of mass m = 50 kg moves on a rough horizontal surface with a coefficient of kinetic friction µ = 0.5. The traveled distance is 20 m. How much work is done by the friction force?
A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the acceleration of the bike.
Which one of the following statement(s) is true? a.A body moving with uniform speed can have variable velocity b.A body moving with uniform velocity can have variable speed c.Average velocity is always equal to instantaneous velocity d.x-t graph can be a straight line parallel to position…
A race car accelerates uniformly from 18 m/s to 46 m/s in 2 seconds. Determine the acceleration of the car and the distance traveled.
Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.60 seconds, what will be his final velocity and how far will he fall?
A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.
A Balloon rises from rest on the ground vertically upwards with a constant acceleration g/8.An object is dropped from the balloon when it has risen to the height h.Find out the time taken by the object to reach the ground.
A bus start at Station A from rest with uniform acceleration 2m/sec2.Bus moves along a straight line b. At what time, it velocity becomes 20m/sec?
A bus start at Station A from rest with uniform acceleration 2m/sec2.Bus moves along a straight line a. Find the distance moved by the bus in 10 sec?
A planet orbits a star once every 3.41 107 s in a nearly circular orbit of radius 1.44 1011 m.
An average brain has a mass of 1.3 kg. It takes a force of roughly 120 N to cause a concussion. If you get into a car accident driving at 18 m/s (roughly 40 mph) where your head (with your brain inside it) comes to a complete stop in 0.15 seconds are you likely to walk away with a…
an attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s from a height of 1.55 m above the ground. (a) will the rock reach the top of the wall? (b) if so, what is its speed at the top? if not, what initial speed must it have to reach the top?
are the two system shown the figure is equivulent? justify
Where can i find the solution to Theresa B's question ? https://www.numerade.com/ask/question/in-a-compton-effect-experiment-the-scattered-light-quantum-is-observed-at-an-angle-of-60circ-to-the--94553/
THE UNIFORM BAR SHOWN IN THE FIGURE WEIGHS AON AND SURECTED TO THE ONCES SHOWN FIND THE MAGNITUDE SOCATION AND DIRECTION OF THE FORCE NEEDED TO KEEP THE BAR IN EQUILIBRIUM
an x-ray with a frequency of 3.3530 x 10^19 hz strikes a metal foil and the scattered photon is detected at an angle of 32.300 degrees relative to the direction of the original x-ray.
10 J of energy is transferred from system 1 to system 2 without changing their temperature. What can we say about their entropies?
1. A ball is thrown upward with an initial velocity of 10 m/s a. How high does the ball rise? b. What is the total time of the flight?
Four identical spheres of masses 2.0 kg each and radius 0.25 m are situated at the four corners of a square. One side of the square measures 3.00 m. Find the moment of inertia about an axis (a) passing through the center of the square and perpendicular to its plane, (b) passing through one of…
determine the angle of twist of wheel b with respect to wheel a the shaft has a diameter of 40mm and is made of 36-steel
determine the angle of twist of wheel b with respect to wheel a