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Question
State the principle of moments. A meter scale is pivoted at 30 cm mark and it is in equilibrium when a mass of 40 g is suspended from 10 cm mark. Calculate the mass of the ruler.
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Solution
Let the mass of 50 g be situated at distance 'd' from the mid-point i.e. at 50cm,
80 x 30 = (40 x 10) + (50 x d)
2400 = 400 + 50d
or 50d = 2000
or d = 40cm to the right of the mid-point.
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