In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out $20 J$ of heat and $10 J$ of work is done on the gas. If the initial internal energy of the gas was $40 J,$ then the final internal energy will be ........ $J$
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(c) $\Delta Q = \Delta U + \Delta W = ({U_f} - {U_i}) + \Delta W$
==> $30 = ({U_f} - 40) + 10$==> ${U_f} = 60J$
==> $30 = ({U_f} - 40) + 10$==> ${U_f} = 60J$
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