Ive just started thermo after being out of the physics game for awhile. The professor is less than stellar and bascially we have to learn out of the book. The problem is easy, I know, but I just can't figure it out. Its as follows:(adsbygoogle = window.adsbygoogle || []).push({});

Cylinder containing gas has piston with cross-sectional area of .029m^2. Atomospheric pressure is .1035MPa and accel. due to gravity is 30.1ft/s^2. To produce absolute pressure of .1517MPa, what mass (kg) of piston is required?

The equation I believe I need to use is

Pabs= (Mp*g) + Patm* Ap

The only problem is I wrote it down quickly and Im not sure its correct, and cannot find it in the book, also cant figure out where area comes into play. Can anyone confirm this eqaution?

Thanks

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# Basic Thermodynamics problem I can't see.

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