Question

A metal plate 10 cm x 10 cm rests on a layer of glycerine 1 mm thick whose coefficient of viscosity is 1.0 kg m^-1s^-1. Find out the horizontal force required to move the plate with a speed of 1 m/s.

Answer 1

Given: A = (10 x 10)cm² = 100 cm²

= 100 x 10^-4 m² = 1 x 10^-2 m²;

∆Z = 1 mm = 1 x 10^-3 m; η = 1.0 kg/ms

∆v = 1.0 cm/s = 10^-2 m/s; F = ?