Q. 20

Water is flowing through a long horizontal tube. Let PA and PB be the pressures at two points A and B of the tube.
A. PA must be equal to PB

B. PA must be greater than PB

C. PA must be smaller than PB

D. PA = PB only if the cross-sectional area at A and B are equal.

Answer :

The pressure at the two points would be equal only if the velocities of the water at these points are equal. This is possible only if the cross-sectional areas are equal at the points. If this is not true, the pressure will vary with the velocities of the water at the points.

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