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나. ? 3 m 어야

나. ? 3 m 어야

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#7 A-B
7. A 60 kg mother and her 25 kg child sit on the ends of a 3m, 80 kg see-saw. The see-saw itself is symmetric, so that its center of gravity is at its midpoint. 3 m A) If the mother and child are perfectly balanced on the see saw, how far from the child is the fulcrum pushing upwards on the see-saw? B) What force does the fulcrum push up with? ?
Transcribed Image Text:7. A 60 kg mother and her 25 kg child sit on the ends of a 3m, 80 kg see-saw. The see-saw itself is symmetric, so that its center of gravity is at its midpoint. 3 m A) If the mother and child are perfectly balanced on the see saw, how far from the child is the fulcrum pushing upwards on the see-saw? B) What force does the fulcrum push up with? ?
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