Q. 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
A) 1
B) $1/2$
C) $2/1$
D) None of these
Explanation
(c) Power $= \frac{W}{t}$ If $W$ is constant then $P \propto \frac{1}{t}$
$i.e.$ $\frac{P_{1}}{P_{2}} = \frac{t_{2}}{t_{1}} = \frac{20}{10} = \frac{2}{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.