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Question

Water is flowing through a horizontal tube. The pressure of the liquid in the portion where velocity is 2 m/s is 2 m of Hg. What will be the pressure in the portion where velocity is 4 m/s

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Solution

According to Bernoulli,s principle
P1+12ρv21+ρgh1 =P2+12ρv22+ρgh2

2mHg+12ρ(2)2 =P2+12ρ(4)2

P2=12×103(2242)+2mHg

P2=6000+2Hg
6000101325(0.76)mHg+2mHg

P2=1.955 m of Hg


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