A paddle wheel adds work to a rigid container by rotations caused by dropping a 50-kg weight a distance of 2 m from a pulley. How much heat must be transferred to result in an equivalent effect?
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Sol. For this non-quasi equilibrium process the work is given by W = (mg) = (50)(9.8)(2) = 980 J. The heat Q that must be transferred equals the work, 980 J.
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