Part (a) Write an expression for the magnitude :1 of the torque due to force F}. Part (b) Calculate the magnitude 1:] of the torque due to force F], in N-m. Part (c) Write an expression for the magnitude r2 of the torque due to force F 2. Part ((1) Calculate the magnitude 1:2 of the torque due to force F 2, in N-m. Part (6) Write an expression for the magnitude r3 of the torque due to force F 3. Part (1) Write an expression for the magnitude 1'4 of the torque due to force F 4. Part (g) Calculate the magnitude 1:4 of the torque due to force F 4, in N11}. Part (11) Calculate the angular acceleration a of the disk about its center of mass in rad/52. Let the counter-clockwise direction be positive. (13%) Problem 4: A uniform disk of mass m = 4.8 kg and radius R = 9 cm can rotate about an axle F, through its center. Four forces are acting on it as shown in the figure. Their magnitudes are F1 = 4.5 N, F2 = 3.5 N, F 3 = 9.5 N and F4 = 6.5 N. F2 and F 4 act a distance d = 2.5 cm from the center of mass. These forces are all in the plane of the disk. Randomized Variables m = 4.8 kg d R= 9 cm 450 F1 = 4.5 N 530 F, = 3.5 N F3 = 9.5 N FA = 6.5 N d = 2.5 cm