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3 The device shown in measure the pressure and volume flow rate when a person...

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3 The device shown in measure the pressure and volume flow rate when a person exhales There is a cylindrical pipe with inside radius R There is a slit of width b running down the length of the cylinder Inside the tube there is a light movable piston attached to an ideal spring of force constant K In equilibrium position the piston is at a position where the slit starts shown by line AB in the figure A person is made to exhale into the cylinder causing the piston to compress the spring Assume that slit width b is very small and the outflow area is much smaller than the cross section of the tube even at the pistons full extension A person exhales and the spring compresses by x Density of air pl a Calculate the gage pressure in the tube b Calculate the volume flow rate Q of the air A 1 R B X

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