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A gas is enclosed in a container fitted with a piston of cross-sectional area 0.150 m. The pressure of the gas is maintained at 6 000 Pa as the piston moves inward 20.0 cm. If the internal energy of the gas decreases by 8.00 J, find the amount of energy removed from the system by heat during the compression.
Using the first law of thermodynamics, explain why the total energy of an isolated system is always constant.
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