(6%) Problem 12: You have a horizontal grindstone (a disk) that is 89 kg, has a 0.37 m radius, is turning at 88 rpm (in the positive direction), and you press a steel axe against the edge with a force of 22 N in the radial direction. F A 50% Part (a) Assuming that the kinetic coefficient of friction between steel and stone is 0.20, calculate the angular acceleration of the grindstone in rad/s a = Grade Summary Deductions 0% Potential 100% sin( cos( tan( 7 8 9 HOME Submissions cotan( asin( acos() E 4 5 6 Attempts remaining: 5 (4% per attempt) atan() acotan() sinhO 2 3 detailed view cosh() tanh() cotanh() U END ODegrees O Radians ACKNIC CLEAR Submit Hint Feedback I gave up! Hints: 1% deduction per hint. Hints remaining: 3 Feedback: 2% deduction per feedback. 50% Part (b) What is the number of turns, N, that the stone will make before coming to rest