Piston Pressure: Forces, Physics & Thermodynamics

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SUMMARY

This discussion focuses on the analysis of forces acting on a piston in a thermodynamics context, specifically addressing the pressures from gas chambers and the spring force. The participants clarify that while gravitational force (Fg = mg) is a common consideration, it is not included in the force equation for this specific problem. The problem involves calculating the pressure in chamber 1 given the diameters of the pistons (D1 = 10 cm, D2 = 4 cm) and the pressures in chambers 2 (2000 kPa) and 3 (700 kPa).

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eurekameh
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So here's an image of a piston. First of all, this is for a thermodynamics class. Is thermodynamics considered to be "physics?" Do physics majors take thermodynamics?

So my question is: When writing the forces on the piston, it is obvious that we have the pressures acting on the piston from the gases in the chambers, and also a spring force on the second piston figure. I thought it was also obvious that there is Fg = mg acting on the piston as well. However, when I peeked at the solution manual, weight is not included in the force equation. Why is this?
 
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Post the exact text of the problem.
 
The piston diameters in Figure are D1 = 10 cm and D2 = 4 cm. When the pressure in chamber 2 is 2000 kPa and the pressure in chamber 3 is 700 kPa, what is the pressure in chamber 1, in kPa?
 

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