In a laminar flow,the velocity of the liquid in contact with the walls of the tube is:

$A$ plastic circular disc of radius $R$ is placed on a thin oil film,spread over a flat horizontal surface. The torque required to spin the disc about its central vertical axis with a constant angular velocity is proportional to

Define the coefficient of viscosity.

Hot liquids flow more easily than cold liquids. Give the reason.

Is viscosity a vector or a scalar?

$A$ flat plate of area $10 \, cm^2$ is separated from a large plate by a layer of glycerine $1 \, mm$ thick. If the coefficient of viscosity of glycerine is $20 \, \text{poise}$, the force required to keep the plate moving with a velocity of $1 \, cm/s$ is .......... $dyne$.