points F.=40.ON R F2=40.ON F.=60.ON Three people are pulling horizontally on a circular platform. The radius of the platform is - 4.50 m with a mass of 150. Kg. All 3 forces are applied at a tangent to the arc of the platform. The moment of inertia of a solid disk is 12mrs. Neglect friction in parts a) and b), but not in part c). If the platform is initially at rest and the applied forces have a constant magnitude, always tangential to the platform, find: a) The magnitude and direction of the angular acceleration vector. b) The length of time required for the platform to complete two full revolutions. c) The magnitude of frictional torque that would cause the platform to be in equilibrium