Question

Height of water dam in hydreolectric power station is 20 m. How much water, in 1 second, should fall on turbine, so that 1MW power is generated ? (g = 10 m/s⁻²)
(A) 5000 kg
(B) 10,000 kg
(C) 500 kg
(D) 7,500 kg

Answer 1

P=1000000W
h=20m
g=10
t= 1s
P=W/t
W=mgh
= m×10×20
W= 200m
1000000=200m/1
m=1000000/200
M = 5000kg
Ans: (A) 5000kg