Physics

When a mass of 50g is hung from 5cm mark of a uniform meter rule. The rule balance on a knife edge placed at the 35cm mark . what is the weight of d meter rule? (take g:10ms-2).

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  1. the 50 g mass is 30 cm from the balance point

    the center of mass of the meter rule is 15 cm from the balance point
    ... half the distance ... twice the mass

    the mass of the rule is twice 50 g
    ... weight is ... m * g ... .05 kg * 10 m/s^2 = .5 N

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  2. oops ... forgot to double the 50 g

    weight of the rule is ... 1 N

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  3. moments in grams * centimeters about 0 cm mark
    clockwise: 50 * 5 + m * 50
    counterclockwise: (m+50) * 35
    so
    250 + 50 m = 35 m + 1750
    15 m = 1500
    m = 100 grams which is 0.100 kilograms
    weight = mass * g = 0.100 kg * 10 meters /second^2 = 1 Newton

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