7. [-/1 Points] SERPSE10 21.4.P.017. ASK YOUR TEACHER PRACTICE ANOTHER A heat pump used for heating shown in the figure below is essentially an air conditioner installed backward. It extracts energy from colder air outside and deposits it in a warmer room. Suppose the ratio of the actual energy entering the room to the work done by the device's motor is 15.0% of the theoretical maximum ratio. Determine the energy entering the room per joule of work done by the motor given that the inside temperature is 25.0C and the outside temperature is 2.00C. i T Heat pump Need Help? [Rsssi Submit Answer 8. [-/1Points] DETAILS MY NOTES SERPSE10 21.7.0P.021. ASK YOUR TEACHER PRACTICE ANOTHER An ice tray contains 380 g of liquid water at 0C. Calculate the change in entropy of the water as it freezes slowly and completely at 0C. JJ/K Need Help? Submit Answer 9. [-/1 Points] DETAILS MY NOTES SERPSE10 21.7.0P.022. ASK YOUR TEACHER PRACTICE ANOTHER A rod made of cobalt with a mass of 0.80 kg is heated to 850C, then dropped into 7.00 kg of water at 11C. What is the total change in entropy (in J/K) of the rod-water system, assuming no energy is lost by heat from this system to the surroundings? The specific heat of cobalt is 420 J/(kg - K), and the specific heat of water is 4,186 J/(kg * K). (Hint: note that dQ = mcdT.) J/K Need Help? [ERasawi Submit