3. (a) Several forces act on a rod as shown below. Determine net torque acting on the rod taking center of rotation as O 6 N AO = 1 m , OB = 2 m, BC = Im A B e LON 16 N F1 F2 B d D (b) Im 3 m NIOON Uniform foot bridge ABCD of weight 100 N and length 8m is placed on two supports at B and C. A box of weight 50 N is placed at A. Determine support forces at B and C. AB =1m, BC= 5m, CD=2m