Mechanical Prop...

A soap bubble of radius R is blown. After heating the solution a second bubble of radius 2R is blown. The work required to blow the second bubble in comparison to that required for the first bubble is

Soap helps in cleaning clothes, because

A wooden stick 2 m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be

The property utilized in the manufacture of lead shots is

A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

Water does not wet an oily glass because

A water drop takes the shape of a sphere in a oil while the oil drop spreads in water, because
(A.E = adhesive force C.F. = cohesive force)

In the glass capillary tube, the shape of the surface of the liquid depends upon

The force required to separate two glass plates of area 10^–2 m² with a film of water 0.05 mm thick between them, is (Surface tension of water is 70 × 10^–3 N/m)

The surface tension of a liquid