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3. Two children are playing on a seesaw of negligible mass. The first child has a mass of 20.0 kg and sits 1.2 m from the pivot. (i) If the second child has a mass of 30.0 kg, how far is she from the pivot? (ii) What is the supporting force exerted by the pivot? 4. (a) Three point masses are attached to a massless rigid rod. Mass mi- 1.0 kg is located at x 1.0 cm, mass m 2.0 kg at x 2.0 cm and mass m-3.0 kg at x 3.0 m. Find the center of mass of the system. (b) Find the center of mass of the four masses as below. m-2.0kg at point (1, 2) cm; 3.0kg at point (2,-3) cm; m 4.0 kg at point (-3,-4) cm and m 5.0 kg at point (4,-5). Solve using a sketch. (3)
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