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5/30 MCQs for:
MECHANICS : ENERGY - Power
If a machine uses 400 J of energy and does 300 J of useful work, what is its efficiency?
What is the power of a motor that lifts a 10 kg object a height of 5 meters in 10 seconds? (Use g = 9.8m/s²) :
What is the total energy used by a 60 W bulb over 10 hours?
Which of the following is the best way to express the efficiency of a power-producing system?
What is the typical power output of a human during strenuous exercise?