since at point X it is at rest all the energy is gravitational potential, right? So if I set mgR equal to .5*m*v^2 and get v = sqrt(2gR) is that correct for part 1?
I think I have solved the first three, and only really need help on question four.
For number one, I used Fc = (Mv^2)/R and just rearranged it for velocity so I ended up with v = sqrt(ac * R)
For number 2 I used Ff = Fn*mu and got Mg*mu = Ff
For number 3 I used w = Ff*d and got w = -Mg*mu*l...