A metal plate of area 10-2m2 rests on a layer of castor oil, 2 × 10-3m thick, whose coefficient of viscosity is 1.55 Ns/m2. The approximate horizontal force required to move the plate with a uniform speed of 3 × 10-2ms-1 is:
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To calculate the force required to move a plate through a viscous fluid, use the equation for viscous force, which includes the coefficient of viscosity, the area of the plate, and the velocity divided by the fluid thickness