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7. [6 marks] When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation: PVl'4 =

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7. [6 marks] When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation: PVl'4 = C, where C is a constant. Suppose that the pressure is decreasing at a rate of 10 kPa/min. Determine the rate of change in volume (in cm3/min) at the point when pressure is 80 kPa, given that C = 235 000

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