A) what will an object weigh on the moon's surface if it weighs 500 n on earth's surface? (b) how many earth radii must this same object be from the center of earth if it is to weigh the same as it does on the moon?
alright, i know how to do part a. but i'm having issues on figuring out how to do part b. !

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?