Find the potential energy of a system of four particles each of mass m placed at the vertices of a square of side `I`.

Find the potential energy of a system of four particles each of mass m place at the vertices of a square fo side l. Also obtain the potential at the centre of the square.

The potential energy of a body of mass 'm' placed at a height h is

What is the potential energy of an object of mass 'm' at a height 'h'?

Express angular momentum of a system of particles in term of M.I.

If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an QBject of mass m raised from the surface of the earth to a height equal to the radius R of the earth is :

A person trying to lose weight (dieter) lifts a 10 kg mass, one , thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated, (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 xx 10^7 J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?

One end of a string of length l is connected to a particle of mass m and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v the net force on the particle (directed towards the centre) is: (i)T,(II) T-(mv^2)//l, (iii) T+(MV^2)/l, (iv)0

Find the length of the side of a square whose area is 441 m^2 .