How much workdone in one hour, if a pump can raise 100 litrrs of water through a height of 200 metres in one minutes?
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The angular momentum of a body is conserved if the resultant external torque on the body is zero. Explanation: This law (or principle) is used by a figure skater or a ballerina to increase their speed of rotation for a spin by reducing the body's moment of inertia.
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