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A mixture of fuel and air is enclosed in an engine cylinder fitted with a
piston. The gas pressure is maintained at 7.07 × 105 Pa as the piston
moves slowly inward. If the gas volume decreases by 1.1 × 10¯4 m³ and
the internal energy of the gas increases by 62 J, how much energy is
added to or removed from the system as heat?

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