JEE Main202329 Jan 2023Evening ShiftPhysicsMechanical Properties of FluidsActual
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 - 1 .
Correct answer
0
Step-by-step solution
Viscous force is given by, | F | = η A Δ v Δ h ⇒ 0 . 1 = 5 × 10 - 3 × 0 . 2 × v 0 . 25 × 10 - 3 ⇒ v = 0 . 025   m   s - 1 ⇒ v = 25 × 10 - 3   m   s - 1