A person decides to use his bathtub water to generate electric power to run a 40 watt bulb. The bathtub is located at a height of 10 m from the ground and it holds 200 liters of water. If we install a water driven wheel generator on the ground, at what rate should the water drain from the bathtub to light bulb? How long can we keep the bulb on, if the bathtub was full initially. The efficiency of generator is 90 %. (g=10m/s -2 )
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(4/9 kg/sec; 450 sec)
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