### How far the piston move

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Q. The 50 kg circular lead piston floats on 0.410 mol of compressed air. What is the piston height h if the temperature is 30oC? How far does the piston move if the temperature is increased by 200 degrees C?

Q. A professor's office door is 0.95 wide, 2.2 high, 4.0 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5.8 .

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