A U - tube open at both ends is partially filledwith water (Fig. P9.80a). Oil (r

Question

A U - tube open at both ends is partially filledwith water (Fig. P9.80a). Oil (rho = 705 kg/m^3) is then poured into theright arm and forms a column L = 6.70 cm high (Fig. P9.80b). Figure P9.80 (a) Determine the difference h in theheights of the two liquid surfaces. (b) The right arm is then shielded from any air motion while air isblown across the top of the left arm until the surfaces of the twoliquids are at the same height (Fig. 9.80c). Determine the speed ofthe air being blown across the left arm. Assume that the density ofair is 1.29 kg/m^3.

Explanation / Answer

we have 1000*(L-h)=705*L => h=2 cm (b)from bernoulli's principle: 1/2*1.29*v2=L*g*(1000-705) L=0.067 m =>v=17.3 m/s

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