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Home Q & A Board Laboratory Help Introductory Courses
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buddysp_vn buddysp_vn
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11 years ago
In a laboratory experiment, a heat engine takes in 200 J of heat and does 60 J of work by expanding in a reversible process. What is the change in internal energy of the engine during this process?
we have a whole new set of problems due monday and no classes to ask questions before they are due could someone please help me out?
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wrote...
#1
11 years ago
dQ = dW+dU
dU = dQ-dW = 140 J
This is true whether the process is reversible or not. (1st law of thermodynamics)
wrote...
#2
10 years ago
200-60 = 140

200 is expressed as a positive value because it is work being done ON the system.
60 is expressed as a negative value because it is work being done BY the system.

Work on the system = +     Work by the system = -
Heat put into system= +     Heat released from system = -

Hope this helps!
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