A gas is contained in a vertical piston–cylinder assembly by a piston with a face area...

A gas is contained in a vertical piston–cylinder assembly by a piston with a face area of 40 in² and weight of 100 lb_f. The atmosphere exerts a pressure of 14.7 lb_f/in² on top of the piston. A paddle wheel transfers 3 Btu of energy to the gas during a process in which the elevation of the piston increases slowly by 2 ft. The piston and cylinder are poor thermal conductors, and friction between the piston and cylinder can be neglected. Determine the work done by the gas on the piston, in Btu, and the change in internal energy of the gas, in Btu.

A force balance on the piston shows that, for this process, the gas pressure is:

constant and negative

constant and positive

increasing and positive

decreasing and positive

Solutions

Expert Solution

genius_generous answered 1 year ago

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