c) As shown in Figure A1-c, a gas is contained in a piston-cylinder assembly. The mass and the cross-sectional area of piston are 3.20 kg and 35 cm², respectively. During heating, the spring is compressed and applies a force of 0.15 kN on the piston when the initial volume increased by 3 litres. Determine the final pressure in the cylinder and the work done by the gas during this process. 150 N = 95 kPa atm mp = 3.2 kg À = 35 cm² Figure A1-c

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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.