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A horizontal tube has a diameter of 12.0 cm on the left, and then shrinks to...

A horizontal tube has a diameter of 12.0 cm on the left, and then shrinks to 6.5 cm on the right. Clear water enters from the left at 4.0 m / s. We assume that the flow is simple laminar. Calculate:

a- the mass flow of the water entering the tube

b- the velocity of the water to the right

c- if the pressure at the outlet is the atmospheric pressure, what is the pressure at the inlet?

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