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Which of the following represents potential energy?
A. A moving car
B. A stretched spring
C. A flowing river
D. A spinning top
Answer: A stretched spring
The power required to do 2000 J of work in 50 seconds is:
A. 40 W
B. 100 W
C. 50 W
D. 20 W
Answer: 40 W
Which energy transformation occurs when a battery powers a flashlight?
A. Chemical to Electrical to Light
B. Electrical to Chemical to Light
C. Chemical to Light to Electrical
D. Electrical to Light to Chemical
Answer: Chemical to Electrical to Light
The work done by a force of 30 N to move an object 5 meters is:
A. 150 J
B. 30 J
C. 5 J
D. 300 J
Answer: 150 J
The energy required to raise a 10 kg object by 10 meters is:
A. 1000 J
B. 200 J
C. 100 J
D. 500 J
Answer: 1000 J
What is the unit of power?
A. Joule
B. Newton
C. Watt
D. Pascal
Answer: Watt
If an object is at rest, its kinetic energy is:
A. Maximum
B. Zero
C. Depends on its mass
D. Depends on its height
Answer: Zero
Which of the following is a correct formula for kinetic energy?
A. KE = 1/2 mv^2
B. KE = mv
C. KE = mgh
D. KE = 1/2 mgh
Answer: KE = 1/2 mv^2
The work done in moving an object depends on which of the following?
A. The force applied and the distance moved
B. The speed of the object
C. The mass of the object only
D. The time taken to move the object
Answer: The force applied and the distance moved