A rotating platform of radius R = 3.9 cm is initially at rest. It then begins to move, such that a point on its edge experiences a tangential acceleration of at = 9.5 cm/s².
a. Write an expression that gives the radical acceleration on the edge of the platform as a function of time.
b. Write an expression for the time at which magnitudes of the radical and tangential accelerations at the edge will be equal.
c. Calculate the time, t in seconds when the magnitude of the radial and tangential accelerations are equal.