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Net Work & Kinetic Energy Solutions Library

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115 solutions

Net Work & Kinetic Energy

Q. Write an expression for the kinetic energy of an object in terms of its momentum p and inertia m. Express your answer in terms of the variables p a...

Solved • Mar 30, 2021

Net Work & Kinetic Energy

Q. An electron has been accelerated from rest through a potential difference of 800 V.a. What is the electron's kinetic energy, in electron volts?b. W...

Solved • Feb 9, 2021

Net Work & Kinetic Energy

Q. A particle of mass M moves along a straight line with initial speed vi. A force of magnitude F pushes the particle a distance D along the direction...

Solved • Jan 22, 2021

Net Work & Kinetic Energy

Q. A box of mass m is sliding along a horizontal surface. Part A. The box leaves position x = 0 with speed v0. The box is slowed by a constant frictio...

Solved • Jan 18, 2021

Net Work & Kinetic Energy

Q. A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.15 and the push i...

Solved • Jan 8, 2021

Net Work & Kinetic Energy

Q. An object’s speed is increased by a factor of threeHow does the object’s kinetic energy change?

Solved • Nov 3, 2020

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. Neglecting air resistance, Sammy Smarts on a high ladder releases a ball that strikes the ground with 100 J of kinetic energy. If he were to instea...

Solved • Jul 14, 2020

Net Work & Kinetic Energy

Q. The amount of kinetic energy an object has depends on its mass and its speed.Rank the following sets of oranges and cantaloupes from least kinetic ...

Solved • Jul 14, 2020

Net Work & Kinetic Energy

Q. The kinetic energy K of an object of mass m moving at a speed v is defined as K = (1/2)mv2. It seems reasonable to say that the speed of an object-...

Solved • Jul 14, 2020

Net Work & Kinetic Energy

Q. An object speed is increased by a factor of three. What does this do to its kinetic energy?a) the kinetic energy increases by a factor of threeb) t...

Solved • Jul 13, 2020

Net Work & Kinetic Energy

Q. Consider a system consisting of three particles with velocities given in terms of a 3D coordinate system (x, y, and z axes): m1 = 2 kg, v1  = < ...

Solved • Jul 9, 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. A. 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 ...

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. Two bullets are fired at the same time with the same kinetic energy.(a) If one bullet has twice the mass of the other, which has the greater speed?...

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/s(a) How much work has gravity done on the baseball whe...

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