A cylindrical vessel 40 cm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5 cm, the angular velocity of rotation, is

For exerting a pressure of 4.8 kg/cm², the depth of oil (specific gravity 0.8), should be

A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m³) when rotated about its vertical axis at 100 r.p.m. The total pressure on its lid, is

An orifice is taken as large if

To avoid the force of surface tension in an inclined manometer, the minimum angle of inclination is