# Answer on Mechanics | Relativity Question for Hello dear

Question #68097

A system recieves 100 calories and the work done by the system is 418 joules.what is the change in its internal energy?

Expert's answer

100 calories = 418.4 joules

The internal energy is calculated as

U=Q+W, where Q is the hear received and W is the work done over the gas.

In our problem

U=Q-W= 418.4-418=0.4 J

The internal energy is calculated as

U=Q+W, where Q is the hear received and W is the work done over the gas.

In our problem

U=Q-W= 418.4-418=0.4 J

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