MHT CET Physics question
Atul decides to use his bath tub water to generate electric power to run a 60 watt bulb. The bath tub is located at a height of 12 m from the ground and has a capacity of 100 liters. If he installs a water-driven wheel generator on the ground, at what rate in kg/s should the water drain from the bath tub to light the bulb? How long can we keep the bulb on if the bath tub was full initially? The efficiency of generator is 80% (g = 10 m/s)
Answer: (B)
Solution
Mechanical power needed = 60/0.8 = 75 W , so kg/s; the 100 kg of
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