\f6. the weight and length of the rigid bar are 10/ and / =3m, the radius and mass of the disk are 15N and 0.5m, when at the horizontal position, the angular velocity of the system is Srad/s (0 = 0, measured from the horizontal axis, please 1 )find the inertia moment of the system about point (; 2) find the maximum of the magnitude of its angular acceleration; 3) find its angular velocity and the reaction force at pin O when the system at the vertical position 8= 90