a uniform metre rule balances horizontally on a knife edge at the 25 cm mark, when amass of 30 grams is hung at the 10 cm mark. calculate the mass of the ruler.
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Explanation: uniform meter rule = 100cm
weight of the ruler = Wr
total clockwise moment =total anti clockwise moment
Wr x (50-25) = 0.3 x (25-10)
Wr x (25) = 0.3 x (15)
25Wr = 4.5
Wr =0.18
recall : Wr = Mr x g
0.18 = Mr x 10
Mr = 0.018 kg
Mr = 18 g = mass of ruler
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