Slide 2: Consider the same seesaw (M = 40 kg and length L = 5.0 m), but now the pivot P is at the far end with a child of m = 30 kg sitting a distance r = 4.0 m to the left of the pivot. To balance the net torque on the beam, a perpendicular rope that can exert a torque via upwards tension force is attached to the beam at a distance r = 1.0 m from the pivot. Calculate the upward force F (tension in the rope) in terms of M, m, r, r, L, and g, and then plug in the values above to find the force F that is needed for equilibrium. '2' 2' m F M L 12