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-A waiter holds two plates of food in one hand. His forearm has a mass of 2.2 kg and the center of mass of his forearm is located 13 cm from his elbow joint. The center mass of the two plates is located 37cm from his elbow joint and the total mass of the two plates is 1.1 kg. His Bicep is attached to the bones of his forearm 3.5 cm from his elbow joint.