Physics

Physics, 22.08.2019 01:30, Isabelcastillox1085

49 tamela12 what is the efficiency of a device that takes in 40,000 j of heat and does 12,000 j of work while giving off 28,000 j of heat? use and convert to a percentage. a. 57% b. 43% c. 30% d. 70%

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Physics, 27.07.2019 03:30, sissygirl0807

Just as no mechanical device can be 100% efficient, no heat engine can transfer 100% of its heat to a single object. some of the heat energy must be wasted (released into the environment). we have a heat engine that produces 150 j of heat, does 40 j of work, and emits 110 j into another system. what is the efficiency of the heat engine? show your work.

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Physics, 21.08.2019 10:30, heintzelmanvp6ir6d

What is the efficiency of a device that takes in 40,000 j of heat and does 12,000 j of work while giving off 28,000 j of heat? use and convert to a percentage. a.70% b. 57% c. 30% d. 43%

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Physics, 20.10.2019 12:30, jeanbeansmith2p2ofty

A. a heat engine converts the flow of heat that results from a difference in temperatures into work. write one or two sentences describing a heat engine that has a low efficiency by comparing the temperatures at which it operates. b. how could you improve the efficiency of a heat engine by decreasing one of the temperatures at which the heat engine operates? c. calculate the amount of heat needed to warm 16.1 kg of water from a room temperature of 20.0°c to 60.0°c. show your work. d. a water heater has an efficiency of 67%. if the water heater takes in 6040 kj of heat to heat up water for a dishwasher, how much total work does it provide? show your work. e. how much energy is lost to the surroundings while heating the water for one cycle of the dishwasher? show your work.

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