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**1. The problem statement, all variables and given/known data**

A gas is enclosed in a container fitted with a piston of cross-sectional area 0.1 m2. The pressure of the gas is maintained constant at 8 kPa, while the gas is heated slowly and the piston moves outward a distance of 40 mm. Heat input to the gas during this process is 42 J. What is the increase in internal energy of the gas?

**2. Relevant equations**

I know that the first law needs to be used here, and i am neglecting Kinetic and Potential Energy

Q-W=(delta)U

**3. The attempt at a solution**

Im having trouble solving for work, this is what i have so far.

42J-8KPa(V2-V1)=(delta) U

any help would be great, thanks

FordRanger