Q.

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

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a

7900 J

b

8900 J

c

6400 J

d

5400 J

answer is A.

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Detailed Solution

Q=W+∆U ⇒       W=Q-∆U                  =2×1000×4.2-500=7900 J
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The internal energy change in a system that has absorbed 2 k cals of heat and done 500 J of work is :