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AP EAMCET202021 Sep 2020Morning ShiftPhysicsThermodynamicsActual

In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases (30 ~J ) of heat and (10 ~J ) of work was done on the gas. If the initial internal energy of the gas was (10 ~J ), then the final internal energy will be

Options

  1. A(2 ~J )
  2. B(-18 ~J )
  3. C(10 ~J )
  4. D(58 ~J )

Correct answer

C. (10 ~J )

Step-by-step solution

Given, heat, (Q=-30 ~J ) Work done on the gas, (W=-10 ~J ) Initial internal energy, (U_i=-10 ~J ) Final internal energy, (U_f= ) ? According to first law of thermodynamics, ( array ll & Q=W+ U & -30=-10+U_i-U_f & -30=-10-10-U_f & 30=10+10+U_f & 30-20=U_f & U_f=10 ~J array )

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