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A person uses a bath tub to generate power for 40W bulb. The bath tub is located at a height of 20m from the ground and holds 200 litres of water. If a water-driven wheel is installed to operate generator and the efficiency of the generator is 90% then at what rate should the water drain from the tub and for how long the bulb will light up?

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A person uses a bath tub to generate power for 40W bulb. The bath tub is located at a height of 20m from the ground and holds 200 litres of water. If a water-driven wheel is installed to operate generator and the efficiency of the generator is 90% then at what rate should the water drain from the tub and for how long the bulb will light up?






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