1.

Calculate the viscous force on a ball of radius 1mm moving through a liquid of viscosity 0.2Nsmpower-1 at the speed of 0.07mspower-1.

Answer»

Given, radius of the ball , R = 1mm = 0.001m
VISCOSITY of liquid , \eta = 0.2 Ns/m²
and terminal velocity or SPEED , v = 0.07 m/s

now, use formula F=6\pi\eta rv

where F represents viscous FORCE.

so, F = 6 × 3.14 × 0.2 × 0.001 × 0.07

F = 0.00026376 N

hence, viscous force = 2.6376 × 10^-4 N



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