A perosn decides to use his bath tub water to generate electric power to run a 40W bulb. The bath tub is located at a height of 10m from the ground and it holds 200 litres of water. He instals a water driven wheel generator on the ground. At what rate should the water drain from the bath tub to light the bulb? How long can he keep the bulb on , if bath tub was full initially ? Efficiency of generator is `90%`. Take `g=9.8m//s^(2)`

A person decides to use bath tub water to generate electric power to run a 40 W bulb. The bath tub is located at a height of 10 m from the ground and it holds 200 liters of water. He installs a water driven wheel generator on the ground. At what rate should the water drain from the bath tub to light the bulb? The density of water is 1000(kg)//(m^3) and efficiency of generator is 80% . How long can he keep the bulb on if the bath tub was full initially.

The bath tub scum is due to the formation of

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