Part A What is Q for path abc? Express your answer to two significant figures an

Question

Part A

What is Q for path abc?

Express your answer to two significant figures and include the appropriate units.

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Part B

If Pc=12Pb, what is W for path cda?

Express your answer to two significant figures and include the appropriate units.

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Part C

What is Q for path cda?

Express your answer to two significant figures and include the appropriate units.

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Part D

What is Eint,aEint,c?

Express your answer to two significant figures and include the appropriate units.

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Part E

If Eint,d Eint,c=12J, what is Q for path da?
(Figure 1)

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

a)

Internal Energy change in path a->c

Uca =Qac -Wac =-66-(-36) =-30 J

For Path a->b->c

Qabc =Uca+Wab =-30+(-58)

Qabc =-88 J

b)

For Path C->d->a

Wcda =Pc(Vd-Vc) =(1/2)Pb(Va-Vb)

Wcda =(1/2)Wba =-(1/2)Wab

Wcda =-(1/2)(-58) =29 J

c)

Qcda =Uac+Wcda=-(-30)+29

Qcda =59 J

d)

Uac=-Uca=-(-30)=30 J

e)

For Path d->a

Qda =Uad-Wda =30-12

Qda=18 J

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