Write an expression for the velocity of the centre of a mass of particles.

Write the expression for average velocity?

Give two characteristics of electromagnetic waves. Write the expression for the velocity of electromagnetic waves in terms of the permitivity and permeability of the medium.

Write an expression for the kinetic energy of an object.

A charge particle enters a magnetic field with velocity v in a direction perpendicular to the field. Find the expression for the redius of the circular path of the particle.

A charged particle enters a magnetic field with a velocity v in a direction perpendicular to the field. Find an expression for the radius of the circular path of the particle.

Obtain an expression for velocity of electromagnetic wave.

Write down the expression for the velocity of electromagnetic wave in a medium and heance find out an expression for the refractive index of the medium.

Write an expression for the work done in rotatory motion.