Homework Answers
a) Wab = 0
Wbc = p*(V - Vo)
= 2*po*(2*vo - vo)
= 2*3.91*10^5*(2*0.0201 - 0.0201)
= 15718 J
Wabc = Wab + Wbc
= 0 + 15718
= 15718 J <<<<<-------Answer
b) change in intenral energy, Uac = (3/2)*n*R*(T -
To)
= (3/2)*(p*v - po*vo)
= (3/2)*(2*po*2*vo - po*vo)
= (9/2)*po*vo
= (9/2)*3.91*10^5*0.0201
= 35366 J
now Apply, dQ = dW + dU
dQ = 15718 + 35366
= 51084 J <<<<<-------Answer
c) effiecly, e = W/Q
= 15718/51084
= 0.3077 or 30.77 %
d) efficiency of cornot engine, n = 1 - To/T
= 1 - po*vo/(p*v)
= 1 - po*vo/(2*po*2*vo)
= 1 - 1/4
= 0.75 or 75 %
e) greater.
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