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A 4.00-kN piano is lifted by three workers at a constant speed to an apartment 27.6 meter above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 177 Watt of power, and the pulley system is 75 percent efficient (thus that 25 percent of the mechanical energy is lost due to friction in the pulley). Ignoring the mass of the pulley, determine the time required to lift the piano from the street to the apartment.

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Category:- Physics
Reference No.:- M91222300

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