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The energy possessed by a moving car is:
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Chemical energy
Answer: Kinetic energy
The power of a device that uses 500 J of energy in 25 seconds is:
A. 20 W
B. 25 W
C. 50 W
D. 10 W
Answer: 20 W
The efficiency of a machine is calculated by:
A. Useful work done / Total energy input
B. Total energy output / Useful work done
C. Work done / Power
D. Force × Distance
Answer: Useful work done / Total energy input
The energy required to compress a spring is an example of:
A. Elastic potential energy
B. Kinetic energy
C. Gravitational potential energy
D. Thermal energy
Answer: Elastic potential energy
The kinetic energy of an object with mass 5 kg and velocity 3 m/s is:
A. 22.5 J
B. 45 J
C. 30 J
D. 15 J
Answer: 22.5 J
The work done to move an object against a force is equal to:
A. The force applied times the distance moved
B. The power used times the time
C. The change in potential energy
D. The energy stored in the object
Answer: The force applied times the distance moved
The power of a machine that performs 2000 J of work in 50 seconds is:
A. 40 W
B. 100 W
C. 50 W
D. 20 W
Answer: 40 W
The energy conversion in a wind turbine is from:
A. Mechanical to electrical
B. Electrical to mechanical
C. Chemical to mechanical
D. Thermal to mechanical
Answer: Mechanical to electrical
The energy required to heat 1 kg of water by 10°C is approximately:
A. 40,000 J
B. 10,000 J
C. 4,000 J
D. 1,000 J
Answer: 40,000 J