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Water flows t...

Question

Water flows through a non uniform tube of area of cross section 25,15,35 cm2 ratio of velocities of water at the sections A B C is

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Solution

Velocity is inversely proportional to r^2

Va:Vb:Vc = 1/25^2 : 1/15^2 : 1/35^2 = 1/25:1/9:1/49 = 441:1225:225

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