a uniform half meter rule balances horizontally on a knife edge at 29cm mark when a weight of 20gf is suspended from one end
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Explanation:
) The centre of gravity of a uniform half meter rule is 25 cm. The rule balances horizontally on a knife edge at 29 cm mark when a weight of 20 kgf is suspended from one end. ... Therefore, the distance from the point of knife edge to the weight = 50-29 =21 cm(X).
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