A man does a given amount of work in 10 sec. Another man does the same amount of work in 20 sec. The ratio of the output power of first man to the second man is
Correct answer: A. 2/1
- A. 2/1
- B. 1/2
- C. 1
- D. 4/1
Explanation
The explanation of this question is: Let us assume that both men do W work. Now, for power: Power = work/time For man 1: P = W/10 For man 2: P = W/20 The ratio of the output powers is: W/10 = W/20 Or 2/1
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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