Fundamentals Of Thermal-fluid Sciences In Si Units
Fundamentals Of Thermal-fluid Sciences In Si Units
5th Edition
ISBN: 9789814720953
Author: Yunus Cengel, Robert Turner, John Cimbala
Publisher: McGraw-Hill Education
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Chapter 7, Problem 20P
To determine

The amount of heat rejected by the engine.

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For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays with time according to a(t) = a(0) exp(-4) (15.10) where σ(t) and o(0) represent the time-dependent and initial (i.e., time = 0) stresses, respectively, and t and T denote elapsed time and the relaxation time, respectively; T is a time-independent constant characteristic of the material. A specimen of a viscoelastic polymer whose stress relaxation obeys Equation 15.10 was suddenly pulled in tension to a measured strain of 0.5; the stress necessary to maintain this constant strain was measured as a function of time. Determine E (10) for this material if the initial stress level was 3.5 MPa (500 psi), which dropped to 0.5 MPa (70 psi) after 30 s.
For the flows in Examples 11.1 and 11.2, calculate the magnitudes of the Δ V2 / 2 terms omitted in B.E., and compare these with the magnitude of the ℱ terms.
Calculate ℛP.M. in Example 11.2.

Chapter 7 Solutions

Fundamentals Of Thermal-fluid Sciences In Si Units

Ch. 7 - Does a heat engine that has a thermal efficiency...Ch. 7 - Prob. 12PCh. 7 - Are the efficiencies of all the work-producing...Ch. 7 - Consider a pan of water being heated (a) by...Ch. 7 - A steam power plant receives heat from a furnace...Ch. 7 - Prob. 16PCh. 7 - Prob. 17PCh. 7 - The thermal efficiency of a general heat engine is...Ch. 7 - Prob. 19PCh. 7 - Prob. 20PCh. 7 - Prob. 21PCh. 7 - Prob. 22PCh. 7 - Prob. 23PCh. 7 - In 2001, the United States produced 51 percent of...Ch. 7 - Prob. 25PCh. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - Prob. 28PCh. 7 - Prob. 29PCh. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Prob. 32PCh. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - What is the Clausius expression of the second law...Ch. 7 - Show that the Kelvin–Planck and the Clausius...Ch. 7 - Prob. 38PCh. 7 - Prob. 39PCh. 7 - A residential heat pump has a coefficient of...Ch. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - A household refrigerator that has a power input of...Ch. 7 - Prob. 45PCh. 7 - Prob. 46PCh. 7 - Prob. 47PCh. 7 - Prob. 48PCh. 7 - A household refrigerator runs one-fourth of the...Ch. 7 - A heat pump used to heat a house runs about...Ch. 7 - Prob. 51PCh. 7 - Consider a building whose annual air-conditioning...Ch. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - Prob. 55PCh. 7 - Prob. 56PCh. 7 - Prob. 57PCh. 7 - Why does a nonquasi-equilibrium compression...Ch. 7 - Prob. 59PCh. 7 - Prob. 60PCh. 7 - Prob. 61PCh. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67PCh. 7 - Is there any way to increase the efficiency of a...Ch. 7 - Prob. 69PCh. 7 - Prob. 70PCh. 7 - Prob. 71PCh. 7 - Prob. 72PCh. 7 - Prob. 73PCh. 7 - Prob. 74PCh. 7 - Prob. 75PCh. 7 - An inventor claims to have devised a cyclical...Ch. 7 - A heat engine receives heat from a heat source at...Ch. 7 - In tropical climates, the water near the surface...Ch. 7 - A well-established way of power generation...Ch. 7 - Prob. 80PCh. 7 - Prob. 81PCh. 7 - Prob. 82PCh. 7 - Prob. 83PCh. 7 - Prob. 84PCh. 7 - Prob. 85PCh. 7 - Prob. 86PCh. 7 - Prob. 87PCh. 7 - Prob. 88PCh. 7 - Prob. 89PCh. 7 - Prob. 90PCh. 7 - Prob. 91PCh. 7 - Prob. 92PCh. 7 - Prob. 93PCh. 7 - Prob. 94PCh. 7 - Prob. 95PCh. 7 - Prob. 96PCh. 7 - Prob. 97PCh. 7 - Prob. 98PCh. 7 - Prob. 99PCh. 7 - Prob. 100PCh. 7 - Prob. 101PCh. 7 - Prob. 102PCh. 7 - Prob. 103PCh. 7 - Prob. 104PCh. 7 - Prob. 105PCh. 7 - Prob. 106RQCh. 7 - Prob. 107RQCh. 7 - Prob. 108RQCh. 7 - Prob. 109RQCh. 7 - Prob. 110RQCh. 7 - Prob. 111RQCh. 7 - Prob. 112RQCh. 7 - Prob. 114RQCh. 7 - Prob. 115RQCh. 7 - Prob. 117RQCh. 7 - Prob. 118RQCh. 7 - Prob. 119RQCh. 7 - Prob. 120RQCh. 7 - Prob. 121RQCh. 7 - Prob. 122RQCh. 7 - Prob. 123RQCh. 7 - Prob. 124RQCh. 7 - Prob. 125RQCh. 7 - Prob. 127RQCh. 7 - The drinking water needs of a production facility...Ch. 7 - Prob. 129RQCh. 7 - Prob. 131RQCh. 7 - Prob. 132RQCh. 7 - Prob. 133RQCh. 7 - Prob. 134RQCh. 7 - Prob. 136RQCh. 7 - Prob. 137RQ
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