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

Monjur Alahi

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.


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Salim Ahmed Kawsar

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

EXPLANATION: 

Pₐ = Pᵦ only if the velocities are equal at A and B (From the Bernoulli's theorem it can be deduced that in a horizontal tube flow pressure is less where velocity is more). The velocities at A and B will be equal only if the cross-sectional areas at A and B are the same. 

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