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5/30 MCQs for:
MECHANICS : ENERGY - Power
A person develops a power of 400 W. How much work does the person do in 20 seconds?
If a machine uses 400 J of energy and does 300 J of useful work, what is its efficiency?
Which of the following represents a typical power rating of a light bulb?
Which of the following is the correct formula for calculating power?
A 2000 W motor is used for 1 hour. How much energy does it consume?