3. A heat pump is to be used to heat a house during the winter, as shown in Fig. A. The house is to be maintained at 21°C at all times. The house is estimated to be losing heat at a rate of 135,000 kJ/h when the outside temperature drops to -5°C. Determine the minimum power required to drive this heat pump. show free-body diagram

From the perspective of energy efficiency an ideal cooking utensil should not absorb a large part of the thermal energy it receives from the stove. It also should not change its size as it is heated. In terms of the specific heat S and coefficient of thermal expansion a, which choice below satisfies these requirements? Both S and a should be large. Both S and a should have small values. Small S but large a. Large S but small a.

Work of 1500 J is done by stirring an insulated beaker containing 100 g of water. a. What is the change in the internal energy of the system? b. What is the change in the temperature of the water?

Which of the following is true about an adiabatic process? Select all those apply. I. It occurs at a constant temperature (AT =0). II. There is no transfer/ exchange of heat (Q = 0) in this process. III. The pressure remains constant. IV. The volume remains constant. V. The adiabatic curve is steeper than the isothermal curve in PV diagram. VI. The isothermal curve is steeper than the adiabatic curve in PV diagram. Answer choices: A. I, II, and V B. I, II, and V C. I, III, and IV D. Il and V E. Il and VI