Question

A force of 0.01 N is required to move a flat glass plate of area of 10 cm² with a uniform velocity of 1 cm/ s over the surface of a liquid 2 mm thick. If the coefficient of viscosity of the liquid is 20 poise, the velocity gradient in the liquid layer is ______.

Options

• 2 x 10^-3 s^-1

• 0.01 s^-1

• 5 s^-1

• 500 s^-1

Answer 1

A force of 0.01 N is required to move a flat glass plate of area of 10 cm² with a uniform velocity of 1 cm/ s over the surface of a liquid 2 mm thick. If the coefficient of viscosity of the liquid is 20 poise, the velocity gradient in the liquid layer is 5 s^-1.