Question 1

A 10.0-kg box starts at rest and slides 6.0 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)

Accepted Answer

A)   6.1 m/s
B)   3.5 m/s
C)   10.7 m/s
D)   4.5 m/s D

Question 2

An amount of work equal to 3.0 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 15 g marble?

Accepted Answer

A)   14 m/s
B)   15 m/s
C)   18 m/s
D)   20 m/s D

Question 3

The net force acting on a 6.0-kg object is given by Fx = (12 - x)N,where Fx is in newtons and x is in meters.How much work is done on the object as it moves from x = 0 to x = 12 m?

Accepted Answer

A)   120 J
B)   72 J
C)   36 J
D)   18 J B

Question 4

I drop a 60-g golf ball from 2.0 m high.It rebounds to 1.3 m.How much energy is lost?

Accepted Answer

A)   0.29 J
B)   0.41 J
C)   0.88 J
D)   1.0 J

Question 5

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 3.0 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

Accepted Answer

A)   36°
B)   30°
C)   19°
D)   47°

Question 6

I use a rope 1.00-m-long to swing a 1.00-kg weight around my head.The tension in the rope is 20.0 N.In half a revolution how much work is done by the rope on the weight?

Accepted Answer

A)   20.0 J
B)   31.4 J
C)   123 J
D)   0

Question 7

A girl and her bicycle have a total mass of 40 kg.At the top of the hill her speed is 5.0 m/s.The hill is 10 m high and 100 m long.If the force of friction as she rides down the hill is 24 N,what is her speed at the bottom?

Accepted Answer

A)   5.0 m/s
B)   10 m/s
C)   11 m/s
D)   She stops before she reaches the bottom.

Question 8

A rock is thrown straight up with an initial velocity of 20.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

Accepted Answer

A)   41.0 m
B)   10.2 m
C)   20.4 m
D)   11.5 m

Question 9

Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp,inclined at 20.0° with the horizontal and leaves it.Tamara accidentally bumps the wheelbarrow.It slides back down the ramp,during which a 60.0-N frictional force acts on it over the 50.0 m.What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)

Accepted Answer

A)   5550 J
B)   6550 J
C)   8150 J
D)   13,100 J

Question 10

A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s2.How far does the car travel before it stops?

Accepted Answer

A)   39 m
B)   31 m
C)   55 m
D)   63 m

Question 11

Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface,what is the net change in potential energy of the crate?

Accepted Answer

A)   120 J
B)   −120 J
C)   250 J
D)   150 J

Question 12

A worker pushes a sled with a force of 40 N over a level distance of 6.0 m.If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker,what total work is done on the wheelbarrow?

Accepted Answer

A)   240 J
B)   216 J
C)   144 J
D)   96 J

Question 13

A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface,what is the force applied by the worker?

Accepted Answer

A)   zero
B)   50 N
C)   30 N
D)   40 N

Question 14

A simple pendulum,2.00 m in length,is released from rest when the support string is at an angle of 35.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)

Accepted Answer

A)   0.941 m/s
B)   1.88 m/s
C)   2.66 m/s
D)   1.33 m/s

Question 15

An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km.What is its total energy (kinetic + potential)if the total was 0 when the airliner was at rest on the ground?

Accepted Answer

A)   250 MJ
B)   478 MJ
C)   8770 MJ
D)   10,300 MJ

Question 16

A bobsled makes a run down an ice track starting at 66 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

Accepted Answer

A)   27 m/s
B)   36 m/s
C)   44 m/s
D)   54 m/s

Question 17

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

Accepted Answer

A)   It is 3 times as much.
B)   It is 8 times as much.
C)   It is 4 times as much.
D)   It is 9 times as much.

Question 18

Water flows over a section of Niagara Falls at a rate of 6.00 × 105 kg/s and falls 50.0 m.What is the power dissipated by the waterfall?

Accepted Answer

A)   588 MW
B)   294 MW
C)   147 MW
D)   60.0 MW

Question 19

Rupel pushes a box 4.00 m by applying a 25.0-N horizontal force.What work does she do?

Accepted Answer

A)   10.0 J
B)   100 J
C)   125 J
D)   550 J

Question 20

Motor 1 does 30 J of work in 10 s,motor 2 does 2 J of work in 5 s,motor 3 does 7 J of work in 2 s,and motor 4 does 7 J of work in 3 s.List the motors in order of highest power produced to lowest power produced.

Accepted Answer

A)   2,4,1,3
B)   3,4,1,2
C)   1,3,4,2
D)   3,1,4,2

Exam 6: Momentum and Collisions: Part A

A 10.0-kg box starts at rest and slides 6.0 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s²)

An amount of work equal to 3.0 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 15 g marble?

The net force acting on a 6.0-kg object is given by F_x = (12 - x) N,where F_x is in newtons and x is in meters.How much work is done on the object as it moves from x = 0 to x = 12 m?

I drop a 60-g golf ball from 2.0 m high.It rebounds to 1.3 m.How much energy is lost?

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 3.0 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

I use a rope 1.00-m-long to swing a 1.00-kg weight around my head.The tension in the rope is 20.0 N.In half a revolution how much work is done by the rope on the weight?

A girl and her bicycle have a total mass of 40 kg.At the top of the hill her speed is 5.0 m/s.The hill is 10 m high and 100 m long.If the force of friction as she rides down the hill is 24 N,what is her speed at the bottom?

A rock is thrown straight up with an initial velocity of 20.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s².How far does the car travel before it stops?

Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface,what is the net change in potential energy of the crate?

A worker pushes a sled with a force of 40 N over a level distance of 6.0 m.If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker,what total work is done on the wheelbarrow?

A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface,what is the force applied by the worker?

A simple pendulum,2.00 m in length,is released from rest when the support string is at an angle of 35.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s² and ignore air resistance)

An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km.What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?

A bobsled makes a run down an ice track starting at 66 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

Water flows over a section of Niagara Falls at a rate of 6.00 × 10⁵ kg/s and falls 50.0 m.What is the power dissipated by the waterfall?

Rupel pushes a box 4.00 m by applying a 25.0-N horizontal force.What work does she do?

Motor 1 does 30 J of work in 10 s,motor 2 does 2 J of work in 5 s,motor 3 does 7 J of work in 2 s,and motor 4 does 7 J of work in 3 s.List the motors in order of highest power produced to lowest power produced.

Exam 6: Momentum and Collisions: Part A

A 10.0-kg box starts at rest and slides 6.0 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)

An amount of work equal to 3.0 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 15 g marble?

The net force acting on a 6.0-kg object is given by Fx = (12 - x) N,where Fx is in newtons and x is in meters.How much work is done on the object as it moves from x = 0 to x = 12 m?

I drop a 60-g golf ball from 2.0 m high.It rebounds to 1.3 m.How much energy is lost?

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 3.0 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

I use a rope 1.00-m-long to swing a 1.00-kg weight around my head.The tension in the rope is 20.0 N.In half a revolution how much work is done by the rope on the weight?

A girl and her bicycle have a total mass of 40 kg.At the top of the hill her speed is 5.0 m/s.The hill is 10 m high and 100 m long.If the force of friction as she rides down the hill is 24 N,what is her speed at the bottom?

A rock is thrown straight up with an initial velocity of 20.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s2.How far does the car travel before it stops?

Adisa pulls a 50-N crate up a 5.0-m long inclined plane at a constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface,what is the net change in potential energy of the crate?

A worker pushes a sled with a force of 40 N over a level distance of 6.0 m.If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker,what total work is done on the wheelbarrow?

A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface,what is the force applied by the worker?

A simple pendulum,2.00 m in length,is released from rest when the support string is at an angle of 35.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)

An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km.What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?

A bobsled makes a run down an ice track starting at 66 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

Water flows over a section of Niagara Falls at a rate of 6.00 × 105 kg/s and falls 50.0 m.What is the power dissipated by the waterfall?

Rupel pushes a box 4.00 m by applying a 25.0-N horizontal force.What work does she do?

Motor 1 does 30 J of work in 10 s,motor 2 does 2 J of work in 5 s,motor 3 does 7 J of work in 2 s,and motor 4 does 7 J of work in 3 s.List the motors in order of highest power produced to lowest power produced.

A 10.0-kg box starts at rest and slides 6.0 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s²)

The net force acting on a 6.0-kg object is given by F_x = (12 - x) N,where F_x is in newtons and x is in meters.How much work is done on the object as it moves from x = 0 to x = 12 m?

A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s².How far does the car travel before it stops?

A simple pendulum,2.00 m in length,is released from rest when the support string is at an angle of 35.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s² and ignore air resistance)

Water flows over a section of Niagara Falls at a rate of 6.00 × 10⁵ kg/s and falls 50.0 m.What is the power dissipated by the waterfall?