A string is wrapped several times around the rim of a small hoop with radius r = 7.90x10−2 m and mass 0.175 kg. The free end of the string is pulled upward in just the right way so that the hoop does not move vertically as the string unwinds. a) Find the tension in the string as the string unwinds ** here I used the equation for I = MR^2 I = (0.175 kg)(7.90×10−2 m)^2 = 1.092×10−3 now how do I find the tension? b) Find the angular acceleration of the hoop as the string unwinds. c) Find the upward acceleration of the hand that pulls on the free end of the string. Please help.