A gas is enclosed in a cylindrical vessel fitted with a frictionless piston.
A gas is enclosed in a cylindrical vessel fitted with a frictionless piston. The gas is slowly heated for some time. During the process, 10J of heat is supplied and the piston is found to move out 10cm. Find the increase in the internal energy of the gas. The area of cross-section of the cylinder = 4cm2 and the atmospheric pressure - 100kPa.
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dQ = 10J
dV = A × 10cm3 = 4 × 10cm3 = 40 × 10–6cm3
dw = Pdv = 100 × 103 × 40 × 10–6 = 4cm3
du = ? 10 = du + dw => 10 = du + 4 => du = 6J.
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