#4 A hoop of mass m = 50 kg and radius r = 0.7 m is released from rest on the inclined surface with ? = 400 . If the hoop rolls without slipping, determine (a) the acceleration of the center of mass, (b) the friction force, and (c) the required friction coefficient. #5 A heavy crate (m = 60 kg) is being lifted and by accident the workman looses his grip when the angle ? = 300 and the crate is initially stationary. What is the angular acceleration immediately after he looses his grip if ? = 0.4, a = 0.7 m, and b = 2 m? Problem 4: A hoop of mass m 50 kg and radius r 0.7 m is released from rest on the inclined surface with A-400. If the hoop rolls without slipping, determine (a) the acceleration of the center of mass, (b) the friction force, and (c) the required friction coefficient. Answer: a) 3.15 m/s2 (down the plane), b) 157.6 N, c) 0.419 Problem 4: A hoop of mass m = 50 kg and radius r = 0.7 m is released Solution Question 4 Answer:(a) 3.15m/sec^2 Answer:(b) 157.6N Answer:(c) 0.419 Question 5 Answer:5 5.76rad/sec^2 CCW.