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5/30 MCQs for:
MECHANICS : ENERGY - Power
A pump transfers 2000 J of energy in 10 seconds. What is the power output of the pump?
A person lifts a 50 kg weight vertically by 2 meters in 10 seconds. What is the power exerted by the person? (Use g = 10m/s²) :
If a 100 W light bulb is used for 5 hours, how much energy does it consume?
If a machine uses 400 J of energy and does 300 J of useful work, what is its efficiency?
What is the unit of power?