Physics, 05.07.2019 01:20 stdntlogin3206
State the first law of thermodynamics in words and show how this relates heat flow work and internal energy. write down an equation that describes this law and state the sign convention for work b. describe what is meant by a heat engine and use a sketch to show the principle of operation for such a device. give one example of a heat engine that is commonly encountered in industry c. you've been asked to design a heat engine that can operate with a theoretical carnot efficiency of at least 25% when the temperature of the cold reservoir is fixed at 50°c. calculate the minimum temperature needed for the hot reservoir to achieve this d. when you construct this device, you find that the actual efficiency is only 15 %. explain why this efficiency is lower than the theoretical limit and what the most likely source of further inefficiency is. e. a heat pump uses 300j of work to pump 200j of heat from the low temperature reservoir to a high temperature reservoir. how much heat is delivered to the high temperature reservoir?
Answers: 2
Physics, 21.06.2019 17:50
Which describes an image that can be produced by a concave lens? the image is real and smaller than the object. the image is virtual and larger than the object. the image is virtual and smaller than the object. the image is real and larger than the object.
Answers: 3
Physics, 22.06.2019 23:10
Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.
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Physics, 23.06.2019 02:30
What are two examples of phase changes that skip a phase during transition?
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Physics, 23.06.2019 08:00
Which of these best describes the term ecliptic? a. the circle where "earth meets the sky" b. the change in azimuth and altitude of an object c. the point directly above the geographic north pole d. the path of the sun through the constellations of the zodiac
Answers: 2
State the first law of thermodynamics in words and show how this relates heat flow work and internal...
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