A stationary block has a charge of +6.0*1^-8C. A 0.80-kg cart with a charge of +4.0*106-8C is initially at rest and separated from the block by 0.4m. The cart is released and moves along a frictionless surface to a distance of 1.0m from the block. Determine as many values of the physical quantities describng the motion of the cart as you can

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?