P15_057 - 57. (a) Bernoullis equation gives pA = pB + 1 air...

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57. (a) Bernoulli’s equation gives p A = p B + 1 2 ρ air v 2 .B u t∆ p = p A p B = ρgh in order to balance the pressure in the two arms of the U-tube. Thus ρgh = 1 2 ρ air v 2 ,or v = s 2 ρgh ρ air
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