Question 1

A feather and a coin dropped in a vacuum fall with equal

Accepted Answer

A) forces due to gravity. 
B) accelerations. 
C) kinetic energies. 
D) none of these 
A) forces due to gravity. 
B) accelerations. 
C) kinetic energies. 
D) none of these

Question 2

A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h?

Accepted Answer

A) 10 m 
B) 30 m 
C) 50 m 
D) 90 m 
A) 10 m 
B) 30 m 
C) 50 m 
D) 90 m

Question 3

The work you do when pushing a shopping cart twice as far while applying the same force is

Accepted Answer

A) half as much. 
B) twice as much. 
C) four times as much. 
D) the same amount. 
A) half as much. 
B) twice as much. 
C) four times as much. 
D) the same amount.

Question 4

When Joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to

Accepted Answer

A) potential energy. 
B) energy of motion. 
C) energy of rest. 
D) heat. 
A) potential energy. 
B) energy of motion. 
C) energy of rest. 
D) heat.

Question 5

A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed using 1000 J of work, is

Accepted Answer

A) 20 W. 
B) 50 W. 
C) 100 W. 
D) 1000 W. 
E) 20,000 W. 
A) 20 W. 
B) 50 W. 
C) 100 W. 
D) 1000 W. 
E) 20,000 W.

Question 6

A 1000-kg car and a 2000-kg car are hoisted to the same height. Raising the more massive car requires

Accepted Answer

A) less work. 
B) as much work. 
C) twice as much work. 
D) four times as much work. 
E) more than four times as much work. 
A) less work. 
B) as much work. 
C) twice as much work. 
D) four times as much work. 
E) more than four times as much work.

Question 7

A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance. When it returns to its initial level its kinetic energy is

Accepted Answer

A) less than 100 J. 
B) more than 100 J. 
C) 100 J. 
D) need more information 
A) less than 100 J. 
B) more than 100 J. 
C) 100 J. 
D) need more information

Question 8

A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of

Accepted Answer

A) less than 100 J. 
B) more than 100 J. 
C) 100 J. 
D) need more information 
A) less than 100 J. 
B) more than 100 J. 
C) 100 J. 
D) need more information

Exam 7: Energy

A feather and a coin dropped in a vacuum fall with equal

A motorcycle moving at 50 km/h skids 10 m with locked brakes. How far will it skid with locked brakes when traveling at 150 km/h?

The work you do when pushing a shopping cart twice as far while applying the same force is

When Joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to

A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed using 1000 J of work, is

A 1000-kg car and a 2000-kg car are hoisted to the same height. Raising the more massive car requires

A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance. When it returns to its initial level its kinetic energy is

A melon is tossed straight upward with 100 J of kinetic energy. If air resistance is negligible the melon will return to its initial level with a kinetic energy of

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