1.
There is a 1mm1\,\text{mm} thick layer of glycerine between a flat plate of area 100cm2100\,\text{cm}^2 and a big fixed plate. If the coefficient of viscosity of glycerine is 1.0kg/m-s1.0\,\text{kg/m-s} then how much force is required to move the plate with a velocity of 7cm/s7\,\text{cm/s}?