Advertisements
Advertisements
प्रश्न
How does the friction arise between the surfaces of two bodies in relative motion?
Advertisements
उत्तर
The force of friction is arised by the interlocking of the irregularities of the two surfaces.
APPEARS IN
संबंधित प्रश्न
The rise of a liquid in a capillary tube depends on
(a) the material
(b) the length
(c) the outer radius
(d) the inner radius of the tube
A 5.0 cm long straight piece of thread is kept on the surface of water. Find the force with which the surface on one side of the thread pulls it. Surface tension of water = 0.076 N m−1.
A cube of ice floats partly in water and partly in K.oil (in the following figure). Find the ratio of the volume of ice immersed in water to that in K.oil. Specific gravity of K.oil is 0.8 and that of ice is 0.9.
Why is the surface tension of paints and lubricating oils kept low?
Derive an expression for capillary rise for a liquid having a concave meniscus.
What will be the shape of the liquid meniscus for the obtuse angle of contact?
A spherical soap bubble A of radius 2 cm is formed inside another bubble B of radius 4 cm. Show that the radius of a single soap bubble which maintains the same pressure difference as inside the smaller and outside the larger soap bubble is lesser than the radius of both soap bubbles A and B.
What is surface tension? Explain the applications of surface tension.
In a U-tube, the radii of two columns are respectively r1 and r2. When a liquid of density ρ(θ = 0°) is filled in it, a level difference of h is observed on two arms, then the surface tension of the liquid is ______.
A spherical liquid drop of radius R is divided into eight equal droplets. If surface tension is T, then the work done in this process will be ______.
