Two pistons of a hydraulic lift have diameters of 60 cm and 5 cm. What is the force exerted by the larger piston when 50 N is placed on the smaller piston?

A metal plate of area 2.5\(\times\)10^-4m² is placed on a 0.25\(\times\)10^-3m thick layer of castor oil. If a force of 2.5 N is needed to move the plate with a velocity 3\(\times\)10^-2m s^-1, calculate the coefficient of viscosity of castor oil.
Given: A = 2.5\(\times\)10-4 m², dx = 0.25\(\times\)10^-3 m, F = 2.5N and dv = 3×10^-2 m s^-1

If excess pressure is balanced by a column of oil (with specific gravity 0.8) 4 mm high, where R = 2.0 cm, find the surface tension of the soap bubble.

Water rises in a capillary tube to a height of 2.0cm. How much will the water rise through another capillary tube whose radius is one-third of the first tube?

Mercury has an angle of contact equal to 140° with soda lime glass. A narrow tube of radius 2 mm, made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside?. Surface tension of mercury T = 0.456 N m^-1; Density of mercury \(\rho\) = 13.6\(\times\)10³ kg m^-3