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Suppose you need to measure the mass of an object, but have only a 7-kg standard mass and a meter stick. Place a knife edge under the 50-cm mark of the meter stick. Then put the 7-kg standard mass at the 39.1-cm mark and place the object so as to balance the standard mass. If the system is balanced when the object is at the 85.9-cm mark, find the unknown mass.

  • physics -

    7*10.9 = M*35.9

    Solve for M

    The two numbers above are the distances of the masses from the fulcrum at the 50 cm midpoint location.

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