Glycerine is filled in 25 mm wide space between two large plane horizontal surfaces. A thin plate of area `0.75 m^(2)` at a distance of 10 mm from one of the surfaces is in a horizontal position be the plates inside the glycerine. It is dragged horizontally at a constant speed of `0.5 ms^(2)`. Take coefficient of viscosity `eta =" 0.5 Ns m"^(-2)`. What is the force required to drag the plate at a constant speed (in newton) ?

Answer

31.25