Question

Assume you have an insulated tank containing 1.5 lbm of Nitrogen at 80 degrees F, and at a pressure of 50 psia. The tank is stirred by a paddle wheel that uses 0.02 hp for 30 minutes. The work that enters the tank from the paddle wheel is thus 25.45 BTU.

Answer 1

as you did not mention any parameter to find I have assumed to find the final temperature and pressure of the nitrogen gas and also nitrogen is chosen as an ideal gas at 80 F.

assumptions: insulated tank Q=0

change in volume is zero

no work transfer from the boundary.

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