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