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A jet of water falls vertically through the air. Upon leaving of the pen, it is...

A jet of water falls vertically through the air. Upon leaving of the pen, it is a jet with a circular section of 1.0 cm diameter and comes out with a speed of 20 cm / s. In a point 10 cm below, (a) how fast is the jet and (b) what diameter is its cross section? Use the flow laws.

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