A rigid tank of constant volume contains 100 kg of water which is churned by a paddle driven by a motor of 1 kW capacity for 30 minutes. During this period it rejects 50 kJ of heat. Find the change in internal energy of water and its rise in temperature. Assume specific heat of water, Sw = 4.19kJ / kg K. %3D Does it represent the displacement work?

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A: given:W=150kj∆U=95kj

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.