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2. (4 pts) A liquid is enclosed in a rigid tank that is fitted with a small paddlewheel. The paddlewheel stirs the liquid for an

2. (4 pts) A liquid is enclosed in a rigid tank that is fitted with a small paddlewheel. The paddlewheel stirs the liquid for an hour. The power of the paddlewheel varies according to Ws = 10t where t is in minutes and the power is in W. Heat is transferred from the liquid to the surroundings at a constant rate of 50 W. What is the rate of change of internal energy of the liquid at 30 minutes in W)? What is the net internal energy change of the liquid after an hour (in kJ

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