Q. The height of the dam, in a hydroelectric power station is 10 m. In order to generate 1 MW of electric power, The mass of water (in kg) that must fall per second on the blades of the turbines is
A) $10^{6}$
B) $10^{5}$
C) $10^{3}$
D) $10^{4}$
Explanation
(d) Power, $p = \frac{mgh}{t}$
Or $\ \ \ \ \ \frac{m}{t} =$mass of water fall per second
$= \frac{p}{gh} = \frac{1 \times 10^{6}}{10 \times 10} = 10^{4}kgs^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.