Q. 194.5( 4 Votes )
Water falling fro
Answer :
Height from which the water falls, h = 50 m
Mass of water falling per hour = 1.8 × 105 kg
Mass of water falling per sec,
m= 50 kg
Gravitational potential energy released per sec = mgh
= 50 × 9.8 × 50
= 24500 J
Electrical energy generated per sec = (Gravitational potential energy)/2
= 24500/2
= 12250 J
Power generated = 12250 J/s or W
Number of 100 W lamps that can be lit from this power = 12250/100 = 122.5 ≈ 122 lamps
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