The value of g at the surface of spherical Asteroid X is 0.00600 m/s2,and the escape speed is 9.95 m/s.What is the radius of this asteroid? (G = 6.67 × 10-11 N ∙ m2/kg2)

A) 8250 m B) 16,000 m C) 1600 m D) 800 m E) 400 m A) 8250 m B) 16,000 m C) 1600 m D) 800 m E) 400 m

Exam 7: Work and Energy

In a physical fitness program,a woman who weighs 510 N runs up four flights of stairs in 22 s.Each flight rises 3.1 m.(1 hp = 746 W) (a)What is her total change in potential energy? (b)What was the minimum average power (in watts)that she expended during the 22 s? (c)What horsepower motor would be required to generate the same power?

(Short Answer)

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Question 121

A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s.What average force of air friction was exerted on the stone as it fell?

(Multiple Choice)

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(96)

Question 122

A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest.If the collision is perfectly inelastic,what is the speed of the masses just after the collision?

(Multiple Choice)

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Question 123

The figure shows a famous roller coaster ride.You can ignore friction.If the roller coaster leaves point Q from rest,what is its speed at the top of the 25-m peak (point S)?

(Multiple Choice)

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Question 124

A spring-loaded dart gun is used to shoot a dart straight up,and the dart reaches a maximum height of 24 meters.The same dart is shot up a second time from the same gun,but this time the spring is compressed only half as far (compared to the first shot).How far up does the dart go this time (neglect all friction and assume the spring is ideal)?

(Multiple Choice)

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(74)

Question 125

In a certain nuclear reactor,neutrons suddenly collide with carbon nuclei,which have 12 times the mass of neutrons.In a head-on elastic collision with a stationary carbon nucleus,what fraction of its initial speed does the neutron have after the collision?

(Multiple Choice)

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(71)

Question 126

In the figure,a ball hangs by a very light string.What is the minimum speed of the ball at the bottom of its swing (point B)in order for it to reach point A, which is 1.0 m above the bottom of the swing?

(Multiple Choice)

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Question 127

An ideal spring has a spring constant of 60 N/m.How much energy does it store when it is stretched by 1.0 cm?

(Multiple Choice)

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Question 128

A certain battery charger uses 12 W of power.At 6.0 cents per kilowatt-hour,how much does it cost to charge batteries for a full day?

(Multiple Choice)

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(83)

Question 129

Two frisky otters slide down frictionless hillsides of the same height but different slopes.The slope of the hill of otter 1 is 30°,while the slope of the hill of otter 2 is 60°.If both start from rest,which otter is moving faster when she reaches the bottom of her hill?

(Multiple Choice)

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Question 130

A 5-kg ball collides inelastically head-on with a 10-kg ball,which is initially stationary.Which of the following statements is true? (There could be more than one correct choice.)

(Multiple Choice)

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Question 131

A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J.It hits a wall and comes back with half its original speed.What is the kinetic energy of this object at this point?

(Multiple Choice)

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(89)

Question 132

A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m.If the coefficient of kinetic friction between the sled and the surface is 0.20,what was the initial speed of the sled?

(Multiple Choice)

4.8/5

(76)

Question 133

An 8.0-g bullet is suddenly shot into a 4.0-kg block that is at rest on a frictionless horizontal surface,as shown in the figure.The bullet remains lodged in the block.The block then moves against a spring and compresses it by 3.7 cm.The force constant (spring constant)of the spring is $2500 \mathrm {~N} / \mathrm { m }$ What was the initial speed v of the bullet? $An 8.0-g bullet is suddenly shot into a 4.0-kg block that is at rest on a frictionless horizontal surface,as shown in the figure.The bullet remains lodged in the block.The block then moves against a spring and compresses it by 3.7 cm.The force constant (spring constant)of the spring is 2500 \mathrm {~N} / \mathrm { m } What was the initial speed v of the bullet?$

(Multiple Choice)

4.9/5

(79)

Question 134

A 100-N force has a horizontal component of 80 N and a vertical component of 60 N.The force is exerted to a cart on a level frictionless floor.The cart starts from rest and moves 2.0 m horizontally along the floor due to this force.What is the cart's final kinetic energy?

(Multiple Choice)

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(96)

Question 135

Which requires more work,increasing a car's speed from 0 mph to 30 mph or from 50 mph to 60 mph?

(Multiple Choice)

4.8/5

(81)

Question 136

The value of g at the surface of spherical Asteroid X is 0.00600 m/s²,and the escape speed is 9.95 m/s.What is the radius of this asteroid? (G = 6.67 × 10^-11 N ∙ m²/kg²)

(Multiple Choice)

4.8/5

(65)

Question 137

A force is exerted on a system doing work W in a time T.What will be the power of the process that involves a force that does six times as much work in half as much time?

(Multiple Choice)

4.8/5

(104)

Question 138

In the figure showing an isolated system,determine the character of the collision.The masses of the blocks,and the velocities before and after,are shown.The collision is

(Multiple Choice)

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(59)

Question 139

In a game of pool,the white cue ball hits the #5 ball and stops,while the #5 ball moves away with the same velocity as the cue ball had originally.Both balls have the same mass.This type of collision is

(Multiple Choice)

4.9/5

(80)

Question 140

Showing 121 - 140 of 191

Exam 7: Work and Energy

A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s.What average force of air friction was exerted on the stone as it fell?

A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest.If the collision is perfectly inelastic,what is the speed of the masses just after the collision?

The figure shows a famous roller coaster ride.You can ignore friction.If the roller coaster leaves point Q from rest,what is its speed at the top of the 25-m peak (point S)?

In a certain nuclear reactor,neutrons suddenly collide with carbon nuclei,which have 12 times the mass of neutrons.In a head-on elastic collision with a stationary carbon nucleus,what fraction of its initial speed does the neutron have after the collision?

In the figure,a ball hangs by a very light string.What is the minimum speed of the ball at the bottom of its swing (point B)in order for it to reach point A, which is 1.0 m above the bottom of the swing?

An ideal spring has a spring constant of 60 N/m.How much energy does it store when it is stretched by 1.0 cm?

A certain battery charger uses 12 W of power.At 6.0 cents per kilowatt-hour,how much does it cost to charge batteries for a full day?

Two frisky otters slide down frictionless hillsides of the same height but different slopes.The slope of the hill of otter 1 is 30°,while the slope of the hill of otter 2 is 60°.If both start from rest,which otter is moving faster when she reaches the bottom of her hill?

A 5-kg ball collides inelastically head-on with a 10-kg ball,which is initially stationary.Which of the following statements is true? (There could be more than one correct choice.)

A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J.It hits a wall and comes back with half its original speed.What is the kinetic energy of this object at this point?

A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m.If the coefficient of kinetic friction between the sled and the surface is 0.20,what was the initial speed of the sled?

A 100-N force has a horizontal component of 80 N and a vertical component of 60 N.The force is exerted to a cart on a level frictionless floor.The cart starts from rest and moves 2.0 m horizontally along the floor due to this force.What is the cart's final kinetic energy?

Which requires more work,increasing a car's speed from 0 mph to 30 mph or from 50 mph to 60 mph?

The value of g at the surface of spherical Asteroid X is 0.00600 m/s2,and the escape speed is 9.95 m/s.What is the radius of this asteroid? (G = 6.67 × 10-11 N ∙ m2/kg2)

A force is exerted on a system doing work W in a time T.What will be the power of the process that involves a force that does six times as much work in half as much time?

In the figure showing an isolated system,determine the character of the collision.The masses of the blocks,and the velocities before and after,are shown.The collision is

In a game of pool,the white cue ball hits the #5 ball and stops,while the #5 ball moves away with the same velocity as the cue ball had originally.Both balls have the same mass.This type of collision is

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The value of g at the surface of spherical Asteroid X is 0.00600 m/s²,and the escape speed is 9.95 m/s.What is the radius of this asteroid? (G = 6.67 × 10^-11 N ∙ m²/kg²)