A gas is contained in a vessel fitted with a movable piston. The container is placed on a stove. A total of 100 cal of heat is given to the gas and the gas does 40 J of work in the expansion resulting from heating. Calculate the increase in internal energy in the process.

Explanation

To solve the problem, we will use the first law of thermodynamics, which states:

\[ Q = W + \Delta U \]

Where:
- \( Q \) is the heat added to the system,
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