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4. (4 marks). When air expands adiabatically?, its pressure and volume are related by. the equation PV14 = C where C is a constant. At

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4. (4 marks). When air expands adiabatically?, its pressure and volume are related by. the equation PV14 = C where C is a constant. At a certain instant the volume is 400cm", the pressure is 80 kPa and the pressure is decreasing at a rate of 10 kPa/min. At what rate is the volume changing at this instant? Note: For full marks, clarify whether the volume is increasing or decreasing

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