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5/30 MCQs for:
MECHANICS : ENERGY - Power
Which of the following is the best way to express the efficiency of a power-producing system?
How much work is done if 500 J of energy is transferred by a machine in 10 seconds?
What is the unit of power in the International System (SI)?
If the power of a machine is 1 kW, how much energy does it consume in 1 hour?
What is the average power developed by a person running up a flight of stairs that requires 1200 J of energy and takes 10 seconds?