Two particles, each of mass m, are a distance d apart. To bring a third particle, also having mass m, from far away to the point midway between the two particles an external agent does work given by:

Two particles each of mass m seperated by a distance d and move in a uniform circle under the action of their mutual force of attraction. The speed of each particle is

The masses and radii of the earth and the moon are M_1,R_1 and M_2,R_2 respectively. Their centres are at a distance d apart. Find the minimum speed with which a particle of mass m should be projected from a point midway between the two centres so that it escape to infinity.

The masses and radii of the Earth and the Moon are M_1, R_1 and M_2,R_2 respectively. Their centres are at a distance d apart. The minimum speed with which a particle of mass m should be projected from a point midway between the two centres so as to escape to infinity is ........

The reduced mass of two particles having masses m and 2m is

The reduced mass of two particles having masses m and 2m is

The reduce mass of two particles having masses m and 2 m is