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A gas is contained in a chamber such as that in Figure below. Suppose the region

ID: 2213230 • Letter: A

Question

A gas is contained in a chamber such as that in Figure below. Suppose the region outside the chamber is evacuated and the total mass of the block and the movable piston is 120 kg. When 2240 J of heat flows into the gas, the internal energy of the gas increases by 1540 J. What is the distance s through which the piston rises?

A gas is contained in a chamber such as that in Figure below. Suppose the region outside the chamber is evacuated and the total mass of the block and the movable piston is 120 kg. When 2240 J of heat flows into the gas, the internal energy of the gas increases by 1540 J. What is the distance s through which the piston rises?

Explanation / Answer

Q = Delta U + W sub B

W sub B = Q - Delta U

W sub B = 2240 - 1540 = 700 j = 700 N. - m. <-----------------

W sub B+P = ( m sub B+P ) ( g / g sub C )

W sub B+P = ( 120 ) ( 9.807 / 1.000 ) = 1177 N. <------------------

W sub B = ( W sub B+P )( s )

s = W sub B / W sub B+P

s = 700 / 1177 = 0.6 m. <----------------------- Answer

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