Interaction Energy Of System Of Particles

Self And Interaction Energy Of Two Spheres

Potential energy of a system of particles is U(alpha)/(3r^(3))-(beta)/(2r^(2)), where r is distance between the particles. Here alpha and beta are positive constants. Which of the following are correct for the system?

Find the potential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r.

Constant the following two statements : A. Liner momentum of a system of particles is zero B . Kinetic energy of a system of particls is zero .Then

Three particles each of mass m are palced at the corners of an equilateral triangle of side b . The gravitational potential energy of the system of particle is