Answered: Consider the cyclic process described…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter3: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 11CQ: It is unlikely that a process can be isothermal unless it is a very slow process. Explain why. Is...

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Question

Consider the cyclic process described by the figure shown below. If Q is negative for the process BC and ΔU is negative for the process CA, determine the signs of Q, W, and ΔU associated with each process.

A pressure-volume graph consists of points and line segments plotted on a coordinate plane, where the horizontal axis is V (m³) and the vertical axis is P (kPa). Three points are plotted:

point A at (6, 2)
point B at (10, 8)
point C at (10, 2)

Line segments connect the three points to form a triangle, and the area inside the triangle is shaded. Arrows along the line segments point from A to B, from B to C, and from C to A.

Consider the cyclic process described by the figure shown below. If Q is negative for the process BC and AU is negative for the process CA, determine the signs of Q, W, and AU
associated with each process.
Process
w
AU
АВ
---Select--- v
---Select--- v
---Select--- v
вс
negative
---Select--- v
---Select--- v
CA
---Select--- v
---Select--- v negative
Р (КРа)
8
В
6.
4
A
C
V (m³)
10
6
8

Process
Δυ
АВ
---Select--- v
---Select-- v
---Select--- v
--Select--
BC
negative
---Select---
positive
negative
|--Select--
negative
CA
zero
P (kPa)
8
B
6
4
A
V (m³)
6 8 10
2.

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