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A coal-fired power plant that operates at an efficiency of 40 % generates 760 MW of electric power. How much heat does the plant discharge to the environment in one day? For related problem-solving tips and strategies, you may want to view a Video Tutor Express your answer with the appropriate units. Solution of Fuel consumption in a truck. LO! HA ? Q = Value Units Submit Request AnswerPart A A diesel engine performs 2200 J of mechanical work and discards 4400 J of heat each cycle. How much heat must be supplied to the engine in each cycle? For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Fuel consumption in a truck. Express your answer in joules. IVO AEd ? Qin = Submit Request Answer V Part B What is the thermal efficiency of the engine? Express your answer as a percentage AEd 1 ? e= % Submit Request AnswerPart A In one cycle, a freezer uses 985 J of electrical energy in order to remove 1750 J of heat from its freezer compartment at 10 F. What is the coefficient of performance of this freezer? IVO AEd 38] ? K = Submit Request Answer V Part B How much heat does it expel into the room during this cycle? Express your answer with the appropriate units. HA QH = Value Units Submit Request Answer Provide Feedbackv FartA A window airconditioner unit absorbs 9.60%104 J of heat per minute from the room being cooled and in the same petiod deposits 1.46:105 J of heat into the outside air. What is the power consumption of the unit in watts? m R_equesl Answer Provide. Fer2d hank Part A A Carnot engine is operated between two heat reservoirs at temperatures of 510 K and 300 K . For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of If the engine receives 6.20 kJ of heat energy from the reservoir at 510 K in each cycle, how many joules per cycle does it reject to the reservoir at 300 K ? A Carnot engine. Express your answer in joules. IVO Qc = Submit Request Answer Part B How much mechanical work is performed by the engine during each cycle? Express your answer in joules. UAL AEd W : Submit Request Answer Part C What is the thermal efficiency of the engine? Express your answer as a percentage. AEd e:Part A An aluminum bar of mass 2.00 kg at 300 C is thrown into a lake. The temperature of the water in the lake is 15.0 C; the specific heat capacity of aluminum is 900 J/(kg . K) . The bar eventually reaches thermal equilibrium with the lake. What is the entropy change A Slake of the lake? Assume that the lake is so large that its temperature remains virtually constant. Express your answer numerically in joules per kelvin View Available Hint(s) AEd FOE ? A Slake = J/K Submit Part B Has the entropy of the aluminum bar decreased or increased? View Available Hint(S) O Since the entropy change of a system is always positive, we can deduce that the entropy of the aluminum bar has increased. O Since the final lower temperature of the bar means lower average speed of molecular motion, we can deduce that the entropy of the bar has decreased. O We don't have enough information to determine whether the entropy of the aluminum bar has decreased or increased. SubmitPart A A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10"C and expels it into the room at 25"C. You put an ice-cube tray containing 425 g of water at 150 C into the freezer. What is the coefficient of performance of this freezer? AEd ? K : Submit Request Answer Part B How much energy is needed to freeze this water? Assume at the end of the process all the water is converted to ice at 0" C. Express your answer with the appropriate units. 1Qcl = Value Units Submit Request Answer Part C How much electrical energy must be supplied to the freezer to freeze the water? Assume at the end of the process all the water is converted to ice at 0" C. Express your answer with the appropriate units. FOE ? W = Value Units Submit Request AnswerPart A A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10"C and expels it into the room at 250 C. You put an ice-cube tray containing 425 g of water at 15" C into the freezer. Part B Part C Part D How much heat does the freezer expel into the room while freezing the water? Assume at the end of the process all the water is converted to ice at 0" C. Express your answer with the appropriate units. HA hFOE ? IQH| = Value Units Submit Request Answer Provide Feedback