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Northbysouth

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## Homework Statement

Air enters aone-inlet, one-exit contreol volume at 6 bar, 500K and 30m/s through a flow area of 28cm

^{3}. At the exit the pressure is 3 bar, the temperature is 456.5 K and the velocity is 300 m/s. The air behaves as an ideal gas. For steady state operation determine

a) the mass flow rate, in kg/s

b) the exit flow area, in cm

^{3}

## Homework Equations

m' = dm/dt = ρvA

## The Attempt at a Solution

I have the area of the cross section, A, and the velocity at both ends, but I'm not sure about the ρ.

Can I use:

ρ = p/RT to find the air density?