1. A gas undergoes isobaric process with a constant pressure of 2000 Pa. If the heat of800 J is added to the process, the volume expands from 0.120 m to 0.200 m. What isthe change in its internal energy?2. An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in eachcycle. What is its efficiency?3. From Question 2, how much work does the engine do in three cycles?4. A refrigerator has a coefficient of performance of 2.0. In each cycle it absorbs 3.4x10J of heat from the cold reservoir. During each cycle, how much heat is released to thehigh-temperature reservoir?5. During running, you lost 4.0x10 J of heat, and your internal energy also decreased by1.6x10* J. How much work did you do in the match?

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1. A gas undergoes isobaric process with a constant pressure of 2000 Pa. If the heat of 800 J is added to the process, the volume expands from 0.120 m' to 0.200 m'. What is the change in its internal energy? 2. An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in each cycle. What is its efficiency? 3. From Question 2, how much work does the engine do in three cycles?

1. A gas undergoes isobaric process with a constant pressure of 2000 Pa. If the heat of 800 J is added to the process, the volume expands from 0.120 m' to 0.200 m'. What is the change in its internal energy? 2. An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in each cycle. What is its efficiency? 3. From Question 2, how much work does the engine do in three cycles?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

1. A gas undergoes isobaric process with a constant pressure of 2000 Pa. If the heat of
800 J is added to the process, the volume expands from 0.120 m to 0.200 m. What is
the change in its internal energy?
2. An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in each
cycle. What is its efficiency?
3. From Question 2, how much work does the engine do in three cycles?
4. A refrigerator has a coefficient of performance of 2.0. In each cycle it absorbs 3.4x10
J of heat from the cold reservoir. During each cycle, how much heat is released to the
high-temperature reservoir?
5. During running, you lost 4.0x10 J of heat, and your internal energy also decreased by
1.6x10* J. How much work did you do in the match?

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