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songoku
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Homework Statement
a piston of mass M is attached to a cylinder made from thermal insulation. There is no friction between the piston and the cylinder. At first, the cylinder is placed horizontally and n mol of an ideal gas of monatomic molecule at the same temperature To and the same pressure Po as the atmosphere is contained in the cylinder. The distance from the bottom of the cylinder to the piston is L as shown in the figure. Let the gas constant be R and let the gravitational acceleration be g.
1. when this cylinder was stood perpendicularly, the piston fell slowly and stopped at a height of L' from the bottom. How much was the increase in the internal energy inside the cylinder at this time?
2. how much was the increase in temperature inside the cylinder at this time?
3. after that, when the inside of the cylinder was heated with the heater, the height of the piston returned from L' to L. How much did the temperature in the cylinder increase as compared with the case where the cylinder was placed horizontally?
Homework Equations
ideal gas
first law of thermodynamics
The Attempt at a Solution
1. done (ans : Mg (L - L') )
2. done (ans : 2/3 Mg (L-L') / nR )
3. don't understand to start...
thanks