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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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The low temperature of a freezer cooling coil is -8.0 ∘C, and the discharge temperature is 35 ∘C.
Part A
What is the maximum theoretical coefficient of performance? (2 sigfigs)
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- Problem 5 Consider a substance that has a melting temperature of T= 159 K at p=1 atm and a melting enthalpy of AHm = 4900 J/mol. Determine the entropy of melting the substance.arrow_forwardA heat engine does 160 J of work per cycle while exhausting 420 J of waste heat. Part A What is the engine's thermal efficiency? Express your answer as a percentage.arrow_forwardOn a hot summer day, 2.00 x 10° J of heat transfer into a parked car takes place, increasing its temperature from 35.5°C to 44.4°C. What is the increase in entropy (in J/K) of the car due to this heat transfer alone? J/K Additional Materials CS Scanned with CamScanner O Readingarrow_forward
- During a cycle, a 42% efficient engine draws 5.20 x 10^3 j of energy from hot reservoir. a. how much enegy is released by the engine in the cold reservoir in one cycle? b. how much work does the egine do in onw cycle?arrow_forwardIn a Carnot engine the hot reservoir is 67.0°C warmer than the cold reservoir. The engine's efficiency is 17.5%. Part A What is the Kelvin temperature of the cold reservoir? Express your answer in kelvins. ? Tc = K Submit Request Answerarrow_forwardConsider a refrigerator undergoing a cycle. a. What is the maximum coefficient of performance that an ideal refrigerator can achieve if it operates between thermal reservoirs at 150K and 220K? b. Is it possible for a refrigerator operating between the same two temperatures of part (a) to have heat transfer in to the cycle of 34 kJ and heat transfer out of 42 kJ? Why or why not?arrow_forward
- Steam locomotives have an efficiency of 15.0% and operate with a hot steam temperature of 475°C. (a) What would the cold reservoir temperature (in °C) be if this were a Carnot engine? °C (b) What would the maximum efficiency of this steam engine be if its cold reservoir temperature were 150°C? % Additional Materials B Reading ds Scanned with CamScannerarrow_forwardA certain coal-fired power plant has a rated power capacity of P = 850 MW. The output of this plant is W = 0.21QH, where QH is the energy input as heat from the hot reservoir. a) Which would increase the efficiency more, doubling QH or reducing QC by half? b) Calculate the maximum thermal efficiency of the power plant. c) Calculate the absolute value of the exhausted heat (QC) each second in MJ for the power plant. d) If the power plant operates for a full day at its rated capacity, how much energy QH in MJ is needed? e) If, on average, one ton of coal contains Q = 25 GJ of energy, how many tons nH of coal would the plant need to operate for a day at its rated capacity? f) How many tons nC of this coal is exhausted as wasted heat to QC in a single day?arrow_forward
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