In a third period battle the girls were able to overcome the boys 3 times in the tug of war. The boys had 8 individuals each pulling with a force of 30 N. The 10 girls were able to pull the rope toward them with a net force of 50 N. What was the minimum amount of force each of the 10 girls applied to the rope.

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.