A glass plate of 0.2 `m^(2)` in area is pulled with a velocity of 0.1 m/s over a larger glass plate that is at rest. What force is necessary to pull the upper plate if the space between them is 0.003 m and is filled with oil of `eta` 0.01 Ns/`m^(2)`.

Explanation

`F=etaA(dv)/(dy)`
`=0.01xx0.2xx(0.1)/(0.003)=66.7xx10^(-3)N`