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Calculus

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The seesaw principle: As you probably know, any two persons can balance each other
when sitting on opposite sides of a seesaw, regardless of their weights. It is only necessary
that each person contribute the same moment — calculated by multiplying the person’s
weight times the distance to the fulcrum. For example, if an 80-
pound child sits at one end of a 20-foot plank, 10 feet from the
fulcrum, a 200-pound adult can balance this system. Tell how.

  • Calculus -

    200 x = 10 * 80
    x = 4

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