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A uniform metre rule balances horizontally on a knife edge placed at the 58 cm mark when a weight of 20gf is suspended from one end. (i) Draw a diagram of the arrangement. (ii) What is the weight of the rule?

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Answer

(i) Diagram of the arrangement is shown below:

Uniform metre rule balances horizontally on knife edge. Force, Concise Physics Class 10 Solutions.

(ii) As we know, the principle of moments states that

Anticlockwise moment = Clockwise moment.

W×(5850)=20gf×(10058)W=20×428W=105gfW \times (58-50) = 20gf \times (100-58) \\[0.5em] \Rightarrow W = \dfrac{20\times42}{8} \\[0.5em] \Rightarrow W = 105 gf

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