- #1

Parallel

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## Homework Statement

Particle x is bounded to another particle P by force which is dependent on their distance 'r',the potential derived from this force is:

U(r) = a/r^3 - b/r^2

a,b>0

(a)how much energy is required to separate the particles?.

(b)suppose particle x has kinetic energy E,how close/far can he get relative to P?(no need to solve the equation,just write it)

## The Attempt at a Solution

well actually I don't even have a clue on where to start.

for (a) my only thought is that I need to see what happens when r-->infinity.

but I don't know where to plug it,(the force,the potential energy)?

I really need some help

thanks