First slide

First law of thermodynamics

Question

Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joules of work

Easy

A

7900 J
B

8200 J
C

5600 J
D

6500 J

Solution

$dQ = dU + dw or dU = dQ - dW = 2 \times 10^{3} \times 4 \cdot 2 joule - 500 joule = 7900 J$

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