Question

A metal block of base area $0.20 \,m^2$ is placed on a table, as shown in figure. A liquid film of thickness $0.25\, mm$ is inserted between the block and the table. The block is pushed by a horizontal force of 0.1 N and moves with a constant speed. If the viscosity of the liquid is $5.0×10^{−3}Pl$, the speed of block is ________ $×10^{−3}m/s$

Answer 1

The answer is 25.