First slide

First law of thermodynamics

Question

A gas is compressed at a constant pressure of 50 N/m² from a volume of 10 m³ to a volume of 4 m³. Energy of 100 J is then added to the gas by heating. Its internal energy is:

Easy

A

increased by 400 J
B

increased by 200 J
C

increased by 100 J
D

decreased by 200 J

Solution

dQ= dU + dW
100 =du +50(4-10)
dU =400 J

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