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Question

Water is flowing through a pipe of non unifrom cross section. at the point when the velocity of flow is 35 cm/s, the pressure is 1 cm of mercury. What is the pressure at the point where the velocity of flow is 65 cm/s?(0.887 cm of mercury)

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Solution

According to Bernoulli's eqn.

P+pgh+12pv2=constant

1g+0.5p352=1gh+0.5652

gh=1×10×1+0.5×1×3520.5×1×652

gh=1490cm

h=149010=149cm

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