1. A mine cage of mass 1.5 tonnes is accelerated uniformly upwards from a speed of 1.1 m/s to 4.6 m/s in a time of 20 seconds. The winding drum which is 1.5 metres in diameter has a mass of 1.2 tonne and has the dynamic characteristics of a disc. There is a bearing friction torque of 48 Nm. For a disc the moment of inertia is given by I = mr^2/2 Determine: a.) the angle turned by the winding drum[/b] 2. I = mr^2/2[/b] 3. Struggling to begin any attempt on this question. alpha = w2^2 - w1^2/2 x sigma?