1.

Rain drop of radius 0.2 mm falling with velocity of2 m/s. If coefficient of viscosity of air is 1.8 x 104Ns/m', determine viscous force acting on the drop.

Answer»

F = 6πanv

= 6*3.14*0.2*10^-4*1.8*10^-4*2

= 13.5648*10^-8 N



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