First slide

First law of thermodynamics

Question

The internal energy change in a system that has absorbed 2 k cals of heat and done 500 J of work is :

Easy

A

7900 J
B

8900 J
C

6400 J
D

5400 J

Solution

$Q = W + ∆ U \Rightarrow W = Q - ∆ U = 2 \times 1000 \times 4.2 - 500 = 7900 J$

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