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Net Work & Kinetic Energy Solutions Library

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103 solutions

Net Work & Kinetic Energy

Q. A car is traveling at 10 m/s. By what factor does the car’s kinetic energy increase if its speed is doubled to 20 m/s?

Solved • Jul 17, 2020

Net Work & Kinetic Energy

Q. A car is traveling at 10 m/s.How fast would the car need to go to double its kinetic energy?

Solved • Jul 16, 2020

Net Work & Kinetic Energy

Q. A 60 kg runner in a sprint moves at 11 m/s. A 60 kg cheetah in a sprint moves at 33 m/s.By what factor does the kinetic energy of the cheetah excee...

Solved • Jun 2, 2020

Net Work & Kinetic Energy

Q. The force shown in the figure (Figure 1) moves an object from x = 0 to x = 0.75 m.How much work is done by the force if the object moves from x = 0...

Solved • May 31, 2020

Net Work & Kinetic Energy

Q. Consider two objects (Object 1 and Object 2) moving in the same direction on a frictionless surface. Object 1 moves with speed v1 = v and has inert...

Solved • May 29, 2020

Net Work & Kinetic Energy

Q. a) If the kinetic energy of a particle is tripled, by what factor has its speed increased?b) If the speed of a particle is halved, by what factor d...

Solved • May 26, 2020

Net Work & Kinetic Energy

Q. a. if a particle's speed increases by a factor of three, by what factor does its kinetic energy change?b. particle A has half the mass and eight ti...

Solved • May 26, 2020

Net Work & Kinetic Energy

Q. Particle A has half the mass and eight times the kinetic energy of particle B. What is the speed ratio vA/vB?

Solved • May 21, 2020

Net Work & Kinetic Energy

Q. Consider two objects (Object 1 and Object 2) moving in the same direction on a frictionless surface. Object 1 moves with speed v1 = v and has inert...

Solved • May 21, 2020

Net Work & Kinetic Energy

Q. Two workhorses tow a barge along a straight canal. Each horse exerts a constant force of magnitude F, and the tow ropes make an angle θ with the di...

Solved • May 11, 2020

Net Work & Kinetic Energy

Q. Which requires more work, increasing a carʹs speed from 0 mph to 30 mph or from 50 mph to 60 mph?A. 50-60 mphB. 0-30 mphC. Same in both cases

Solved • May 11, 2020

Net Work & Kinetic Energy

Q. Chris jumps off a bridge with a bungee cord (a heavy stretchable cord) tied around his ankle as shown in the figure . He falls for 15 m before the ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 16-kg sled starts up a 28 incline with a speed of 2.3 m/s . The coefficient of kinetic friction is exttip{mu_{ m k}}{mu_k} = 0.26.How far up t...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Proper design of automobile braking systems must account for heat buildup under heavy braking.Calculate the thermal energy dissipated from brakes i...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. If the human body could convert a candy bar directly into work, how high could a 76 kg man climb a ladder if he were fueled by one bar (=1100 kJ)?I...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 3.0 g locust reaches a speed of 3.0 m/s during its jump.What is its kinetic energy at this speed?If the locust transforms energy with 40 % eff...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 6.10 kg block is pushed 9.30 m up a smooth 38.0  inclined plane by a horizontal force of 76.0 N . If the initial speed of the block is 3.30 m/s u...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. One car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 7.5 m/s , they then have t...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. How much work is done by the horizontal force FP = 150 N on the 18-kg block of the figure when the force pushes the block 6.0 m up along the 32 f...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. At an accident scene on a level road, investigators measure a cars skid mark to be 93 m long. It was a rainy day and the coefficient of friction w...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 51.0 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 240 N . For the first 11.5 m the floor is frictio...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A train is moving along a track with constant speed v1 relative to the ground. A person on the train holds a ball of mass m and throws it toward th...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. At room temperature, an oxygen molecule, with mass of 5.31 10 - 26 kg, typically has a kinetic energy of about 6.21 10 - 21 J.How fast is it moving?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. If the kinetic energy of a particle is tripled, by what factor has its speed increased?If the speed of a particle is halved, by what factor does it...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. How much work is required to stop an electron ( m = 9.11 10 - 31 kg ) which is moving with a speed of 1.60×106 m/s ?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. How much work must be done to stop a 1300 kg car traveling at 90 km/h?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 145 g baseball traveling 33 m/s moves a fielders glove backward 25 cm when the ball is caught. What was the average force exerted by the ball on ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A box of mass 5.5 kg is accelerated from rest by a force across a floor at a rate of 2.6 m/s2 for 5.6 s .Find the net work done on the box.

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A little red wagon with mass 7.10 kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of 3.60 m/s and ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A car is traveling on a level road with speed v0 at the instant when the brakes lock, so that the tires slide rather than roll.You may want to revi...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 6.0-kg box moving at 5.0 m/s on a horizontal, frictionless surface runs into a light spring of force constant 75 N/cm. You may want to ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. At a waterpark, sleds with riders are sent along a slippery, horizontal surface by the release of a large, compressed spring. The spring with a for...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Use the work–energy theorem to solve each of these problems.(a) A skier moving at 5.01  m/s encounters a long, rough, horizontal patch of snow havi...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. You push your physics book 1.80 m along a horizontal tabletop with a horizontal push of 2.60 N while the opposing force of friction is 0.650 N . ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Adult cheetahs, the fastest of the great cats, have a mass of about 70.0 kg and have been clocked at up to 72.0 mph (32.2 m/s ).You may want to r...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. About 50000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Recent (2005) measurements estimate that this meteor ha...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. You are a member of an Alpine Rescue Team and must project a box of supplies up an incline of constant slope angle exttip{alpha }{alpha} so that i...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 12-pack of Omni-Cola (mass 4.30 kg) is initially at rest on a horizontal floor. It is then pushed in a straight line for 1.20 m by a trained d...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. On an essentially frictionless, horizontal ice rink, a skater moving at 6.0 m/s encounters a rough patch that reduces her speed by 46 % due to a ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. You are asked to design spring bumpers for the walls of a parking garage. A freely rolling 1300 kg car moving at 0.66 m/s is to compress the spri...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 2.30-kg textbook is forced against a horizontal spring of negligible mass and force constant 260 N/m , compressing the spring a distance of 0.260...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Two blocks are connected by a very light string passing over a massless and frictionless pulley (the figure ). Traveling at constant speed, the 20....

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A factory worker pushes a 30.0 kg crate a distance of 3.3 m along a level floor at constant velocity by pushing downward at an angle of 30 below t...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A block of ice of mass 4.10 kg is placed against a horizontal spring that has force constant exttip{k}{k} = 210 N/m and is compressed a distance...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 1.50 kg book is sliding along a rough horizontal surface. At point exttip{A}{A} it is moving at 3.21 m/s , and at point exttip{B}{B} it has sl...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. In the Bohr model of the atom, the ground-state electron in hydrogen has an orbital speed of 2190 km/s.The mass of an electron is 9.1110-31. What...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A soccer ball with mass 0.460 kg is initially moving with speed 2.20 m/s. A soccer player kicks the ball, exerting a constant force of magnitude 41...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A factory worker pushes a crate of mass 30.1 kg a distance of 4.55 m along a level floor at constant velocity by pushing horizontally on it. The ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 33.0 kg crate is initially moving with a velocity that has magnitude 4.01 m/s in a direction 37.0 west of north.How much work must be done on ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A small block with a mass of 0.0600 kg is attached to a cord passing through a hole in a frictionless, horizontal surface . The block is ori...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. You throw a 3.00-N rock vertically into the air from ground level. You observe that when it is 15.1 m above the ground, it is traveling...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A sled with mass 12.10 kg moves in a straight line on a frictionless horizontal surface. At one point in its path, its speed is 4.51 ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A block of ice with mass 2.00 kg slides 1.61 m down an inclined plane that slopes downward at an angle of 36.9 below the horizontal....

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Use the work-energy theorem to solve each of these problems. You can use Newtons laws to check your answers. Neglect air resistance in all cases.A ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. T. Rex. The dinosaur Tyrannosaurus rex is thought to have had a mass of about 7000 kg.Treat the dinosaur as a particle and estimate its kinetic ene...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and yo...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Your cat "Ms." (mass 7.00 kg) is trying to make it to the top of a frictionless ramp 2.00 m long and inclined upward at 30.0 above the horizontal....

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. The figure shows how the force exerted by the string of a compound bow on an arrow varies as a function of how far back the arrow is pulled (the d...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. On April 13, 2029 (Friday the 13th!), the asteroid 99942 Apophis will pass within 18600 mi of the earth-about 1/13 the distance to the moon! It has...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A batter hits a baseball with mass 0.150 kg straight upward with an initial speed of 28.0 m/sHow much work has gravity done on the baseball when i...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. The mass of a proton is 1836 times the mass of an electron.A proton is traveling at speed V . At what speed (in terms of V ) would ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A car is stopped in a distance exttip{D}{D} by a constant friction force that is independent of the cars speed.What is the stopping distance (in t...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A moving electron has kinetic energy K1 . After a net amount of work W has been done on it, the electron is moving one-quarter as fast in the...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. One end of a horizontal spring with force constant 76.0 N/m is attached to a vertical post. A 4.00-kg can of beans is attached to the oth...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. If a particles speed increases by a factor of 5, by what factor does its kinetic energy change?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Particle A has half the mass and eight times the kinetic energy of particle B. What is the speed ratio vA / vB?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 0.2 kg plastic cart and a 20 kg lead cart both roll without friction on a horizontal surface. Equal forces are used to push both carts forward a ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A ball shot straight up with kinetic energy K0 reaches height h.What height will it reach if the initial kinetic energy is doubled?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. You throw a 5.5 g coin straight down at 4.0 m/s from a 55-m-high bridge.How much work does gravity do as the coin falls to the water belo...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. The gravitational attraction between two objects with masses m1 and m2, separated by distance x, is F=Gm1m2/x2, where G is the grav...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 65 kg softball player slides into second base, generating 750 J of thermal energy in her legs and the ground.How fast was she run...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Youre fishing from a tall pier and have just caught a 1.3 kg fish. As it breaks the surface, essentially at rest, the tension in the vertic...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A horizontal spring with spring constant 85 N/m extends outward from a wall just above floor level. A 6.5 kg box sliding across a fricti...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A horizontal spring with spring constant 270 N/m is compressed by 20 cm and then used to launch a 300 g box across the floor. The coefficient of ki...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A pile driver lifts a 350 kg weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of 1...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 400 g particle moving along the x-axis experiences the force shown in the figure. The particle's velocity is 9.0 m/s at x = 0 m. What is its velo...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A cable with 21.0 N of tension pulls straight up on a 1.50 kg block that is initially at rest. You may want to review (Pages 251 - 252).What i...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 45 g rock is placed in a slingshot and the rubber band is stretched. The magnitude of the force of the rubber band on the rock is shown b...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 500 kg elevator accelerates upward at 1.3 m/s2 for 19 m, starting from rest.(a) How much work does gravity do on the elevator?(b) How much work d...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. The figure shows the kinetic-energy graph for a 2.0 kg object moving along the x-axis. Determine the work done on the object during each of the fou...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Starting from rest, a crate of mass m is pushed up a frictionless slope of angle heta by a horizontal force of magnitude F. Use work and energy to...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Susan's 12.0 kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30 degrees above the floor. The t...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A 53.0 kg ice skater is gliding along the ice, heading due north at 4.20 m/s . The ice has a small coefficient of static friction, to prevent the ...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. An 8.1 kg crate is pulled 5.1 m up a 30 incline by a rope angled 18 N above the incline. The tension in the rope is 130 (Pages 222 - 223) and t...

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Which has the larger kinetic energy, a 10 g bullet fired at 500 m/s or a 75 kg bowling ball rolled at 5.5 m/s ?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. At what speed does a 1600 kg compact car have the same kinetic energy as a 1.80×104 kg truck going 24.0 km/hr ?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A mother has four times the mass of her young son. Both are running with the same kinetic energy.What is the ratio vs/vm other of their speeds?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. A ball on a string travels once around a circle with a circumference of 2.0 m. The tension in the string is 5.0 N.How much work is done by tension?

Solved • Oct 31, 2018

Net Work & Kinetic Energy

Q. Review. A 7.80-g bullet moving at 575 m/s strikes the hand of a superhero, causing the hand to move 5.50 cm in the direction of the bullet’s veloci...

Solved • Oct 19, 2018

Net Work & Kinetic Energy

Q. Review. You can think of the work–kinetic energy theorem as a second theory of motion, parallel to Newton’s laws in describing how outside influenc...

Solved • Oct 19, 2018

Net Work & Kinetic Energy

Q. A 0.600-kg particle has a speed of 2.00 m/s at point Ⓐ and kinetic energy of 7.50 J at point Ⓑ. What is (a) its kinetic energy at Ⓐ, (b) its speed ...

Solved • Oct 19, 2018

Net Work & Kinetic Energy

Q. A block of mass m = 2.50 kg is pushed a distance d = 2.20 m along a frictionless, horizontal table by a constant applied force of magnitude F = 16....

Solved • Oct 18, 2018

Net Work & Kinetic Energy

Q. Jonathan is riding a bicycle and encounters a hill of height h. At the base of the hill, he is traveling at a speed vi . When he reaches the top of...

Solved • Oct 18, 2018

Net Work & Kinetic Energy

Q. Jonathan is riding a bicycle and encounters a hill of height 7.30 m. At the base of the hill, he is traveling at 6.00 m/s. When he reaches the top ...

Solved • Oct 18, 2018

Net Work & Kinetic Energy

Q. An older-model car accelerates from 0 to speed v in a time interval of Δt. A newer, more powerful sports car accelerates from 0 to 2v in the same t...

Solved • Oct 18, 2018

Net Work & Kinetic Energy

Q. An 80.0-kg skydiver jumps out of a balloon at an altitude of 1 000 m and opens his parachute at an altitude of 200 m.(a) Assuming the total retardi...

Solved • Oct 18, 2018

Net Work & Kinetic Energy

Q. A 40.0-kg box initially at rest is pushed 5.00 m along a rough, horizontal floor with a constant applied horizontal force of 130 N. The coefficient...

Solved • Oct 18, 2018

Net Work & Kinetic Energy

Q. A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which m...

Solved • Oct 15, 2018

Net Work & Kinetic Energy

Q. A truck has four times the mass of a car and is moving with twice the speed of the car. If Kt and Kc refer to the kinetic energies of truck and car...

Solved • Apr 6, 2017

Net Work & Kinetic Energy

Q. A 10 kg object slides down an incline of 30 o. If the object starts at a height of 30 cm, and feels a coefficient of kinetic friction of 0.2 down t...

Solved • Feb 20, 2017