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Estimate mechanical power converted to thermal energy

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Q: Water is pumped from a lower reservoir to a higher reservoir by a pump that provides 20 kW of shaft power. The free surface of the upper reservoir is 45 m higher than that of the lower reservoir. If the flow rate of water is measured to be 0.03 m3/s, determine mechanical power that is converted to thermal energy during this process due to frictional effects.

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Mechanical Engineering: Estimate mechanical power converted to thermal energy

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