At a point P in a water pipe line the velocity is 1 ms-1 and the pressure is 3×105 pa . At another point Q the area of cross section is half that of at P and the pressure is 5×105 pa . The difference of heights between P and Q in metre is ( g = 10 ms-2)

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10.5

20.15

4.5

zero

answer is B.

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Detailed Solution

p1+12ρv12+ρgh1=p2+12ρv22+ρgh2

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