29) An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot re

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29 An Irreversible Engine Operating Between The Temperatures Of 550 K And 300 K Extracts 1200 J Of Heat From The Hot Re 1 (39.35 KiB) Viewed 47 times

29) An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot reservoir and produces 450 J of work. How much entropy is created in the process? A) 0.73 J/K B) 0.44 J/K C) 0.68 J/K D) 0.32 J/K E) 0 J/K 30) What is the maximum efficiency of an engine operating between 500 K and 300 K? A) 60% B) 40% C) 50% D) 20% 31) If the absolute temperature of an object is tripled, the thermal power radiated per unit surface area of this object will (assuming that its emissivity is not affected by the temperature change) A) increase by a factor of 3. B) increase by a factor of 27. C) increase by a factor of 9. D) increase by a factor of 81. E) increase by a factor of 18. 32) When water freezes, the entropy of the water A) increases. B) decreases. C) could either increase or decrease; it depends on other factors. D) does not change. E) 30% 51