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The energy conversion in a steam turbine involves:
A. Thermal to mechanical
B. Mechanical to thermal
C. Electrical to thermal
D. Chemical to mechanical
Answer: Thermal to mechanical
The energy used to move an object at a constant velocity is:
A. Equal to the work done
B. Equal to the power used
C. Equal to the energy stored
D. Equal to the change in potential energy
Answer: Equal to the work done
The work done to lift a 4 kg object to a height of 5 meters is:
A. 200 J
B. 20 J
C. 40 J
D. 50 J
Answer: 200 J
The energy of an object at the top of a hill is mainly:
A. Potential energy
B. Kinetic energy
C. Thermal energy
D. Chemical energy
Answer: Potential energy
The power of a machine is a measure of:
A. The rate at which work is done
B. The total work done
C. The force applied
D. The distance moved
Answer: The rate at which work is done
The work done by a force of 10 N over a distance of 5 meters is:
A. 50 J
B. 10 J
C. 5 J
D. 100 J
Answer: 50 J
The energy conversion in an electric heater involves:
A. Electrical to thermal
B. Thermal to electrical
C. Mechanical to electrical
D. Chemical to electrical
Answer: Electrical to thermal
The work done to lift a 3 kg object to a height of 4 meters is:
A. 120 J
B. 30 J
C. 12 J
D. 60 J
Answer: 120 J
The power of a machine that performs 3000 J of work in 60 seconds is:
A. 50 W
B. 100 W
C. 60 W
D. 75 W
Answer: 50 W