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A horizontally-oriented cylinder contains an unknown noble gas at 54700 Pa and is sealed with a massless piston of radius 0.316 m. The piston

A horizontally-oriented cylinder contains an unknown noble gas at 54700 Pa and is sealed with a massless piston of radius 0.316 m. The piston is quasi-statically and isobarically moved inward 0.176 m. while 19500 J of heat is removed from the gas. Calculate the change in internal energy AU of the system.

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