49. (a) The change in internal energy Δ E int is the same for path iaf and path ibf . According to the first law of thermodynamics, Δ E int = Q – W , where Q is the heat absorbed and W is the work done by the system. Along iaf Δ E int = Q – W = 50 cal – 20 cal = 30 cal. Along ibf , W = Q – Δ E int = 36 cal – 30 cal = 6.0 cal. (b) Since the curved path is traversed from f to i the change in internal energy is –30 cal
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.