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The work done in lifting a 2 kg object to a height of 3 meters is:
A. 60 J
B. 6 J
C. 30 J
D. 12 J
Answer: 60 J
The energy stored in a 10 kg object lifted to a height of 6 meters is:
A. 600 J
B. 100 J
C. 60 J
D. 1000 J
Answer: 600 J
The energy conversion in a solar panel is:
A. Solar to electrical
B. Electrical to thermal
C. Chemical to electrical
D. Mechanical to electrical
Answer: Solar to electrical
The power of an engine that performs 8000 J of work in 20 seconds is:
A. 400 W
B. 800 W
C. 200 W
D. 160 W
Answer: 400 W
The kinetic energy of a 3 kg object moving at 4 m/s is:
A. 24 J
B. 12 J
C. 48 J
D. 16 J
Answer: 24 J
The energy conversion in a light bulb involves:
A. Electrical to light and thermal energy
B. Thermal to electrical and light energy
C. Chemical to electrical and light energy
D. Mechanical to electrical and light energy
Answer: Electrical to light and thermal energy
The work done to move an object is:
A. The force applied times the distance moved
B. The energy stored in the object
C. The power used times the time
D. The change in potential energy
Answer: The force applied times the distance moved
The work done by a force of 75 N moving an object 4 meters is:
A. 300 J
B. 75 J
C. 20 J
D. 15 J
Answer: 300 J
The energy used in a car engine is primarily converted from:
A. Chemical energy to mechanical energy
B. Mechanical energy to chemical energy
C. Electrical energy to chemical energy
D. Chemical energy to electrical energy
Answer: Chemical energy to mechanical energy