The 8 kg heavy disk shown in Figure 1 has a channel in which a 0.5 kg heavy pin can side with friction #p 0.2. The disk has radius r=0.6 m and the channel is 0.1 m away from the contre of the disk. The system is shown at the instant when it is left free from rest. The angle of the inchine is 30". Knowing that the disk rolls without slipping, determine: the acceleration of the centre of the disk, the acceleration of the pin P, and the minimum coefficient of friction between the disk and the ground at the initial instant. 3