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Q.

In a horizontal pipeline of uniform cross section the pressure falls by 8 N/m between two points separated by 1 km. If oil of density 800 kg/m flows through the pipe, find the change in KE per kg of oil at these points

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a

10−2J/kg

b

10−3J/kg

c

10−4J/kg

d

10−1J/kg

answer is C.

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Detailed Solution

Velocity of the liquid just after coming out of section is v3=2ghA2v2=A4v3⇒v2=12v3=hg2From Bernoulli's theorem P0+12ρv32=P2=12ρv22⇒P2=P0+12ρ(v32−v22)=P0+12ρ2gh−gh2⇒P2=P0+3ρgh4
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