Answered: 1.3. 10. A polytropic process of air…

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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p89#10. a polytropic process of air from 150psia,300degree farenheit and 1ft^3 occurs to p2=20psia in accoridance with pV^1.3=C. Dtermine (a)t2 and V2,(b) change in internal enegry,change in enthalpy and change in entropy,(c)integral of pdV and -integral of Vdp.(d) compute the heat from the polytopic specific heat and check by the equation Q=change in internal energy + pdV. (e) find the nonflow work and (f) the steady flow work for change in kineteic energy=0.

10. A polytropic process of air from 150 psia, 300°F, and 1 ft occurs to p2= 20 psia
in accordance with pv1.3= C. Determine (a) t₂and V₂, (b) AU, AH and AS, (c) S pdv and -
Vdp. (d) Compute the heat from the polytropic specific heat and check by the equation Q =
AU + pdV. (e) Find the nonflow work and (f) the steady flow work for AKE=0.
Ans. (a) 17.4°F, 4.711 ft³; (b) -25.81 Btu, -36.14 Btu, 0.0141 Btu/R; (c) 34.41 Btu,
44.73 Btu; (d) 8.60 Btu; (e) 34.41 Btu; (f) 44.73 Btu

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