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Sarah Jessica Parker is waiting tables at Bennigan’s. She needs to balance a tray with a burger and a coke. The large coke weighs 0.5 pounds. The burger weighs 0.3 pounds. The distance from the middle of her hand to the center of the coke glass is 6 inches. How far away from the center of the hand does the center of the burger need to be placed? What type of lever system is this?
Tom Hanks is using a crowbar to move a large rock. The distance from the fulcrum to the rock is 10 inches and the distance between from the fulcrum to Tom’s hands is 25 inches. The rock weighs 50 pounds. How much force does Tom need to put on the crowbar to lift the rock?
Arnold S. is cleaning up his back yard. He is gathering the yard waste in his wheelbarrow. The wheelbarrow weighs 20 lbs. The yard waste weighs 60 lbs. The center of gravity of the wheelbarrow and yard waste is located a distance of 2 feet from the wheel center. The handles are 4 feet from the wheel center. How much force does Arnold need to lift the wheelbarrow so he can start moving it?
Jennifer Anniston is holding a 6 pound purse on her hand which exerts an external torque (along the weight of her forearm and hand) that equals the internal torque of her biceps acting on the forearm, causing her elbow to be maintained in a position of 90 degrees of flexion. The weight of her forearm and hand is 5 pounds, the center of gravity of the forearm and hand is located 8 inches distal to the elbow, and the insertion of the biceps is 2 inches distal to the elbow. If the internal torque is 100 foot-pounds, what must be the distance from her hand to her elbow?