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ICSE Class 10 Physics Question 8 of 27

Solved Sample Paper 1 — Question 20

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Question 2(v)

A uniform hall meter rule balances horizontally on a knife edge at 29 cm mark when a weight of 20 gf is suspended from one end.

(a) Draw a diagram of the arrangement

(b) What is the weight of the half meter rule?

Answer

(a) Diagram of the arrangement is shown below:

A uniform half metre rule balances horizontally on a knife edge at 29 cm mark when a weight of 20 gf is suspended from one end. Draw a diagram of the arrangement. What is the weight of the half metre rule? ICSE 2017 Physics Solved Question Paper.

(b) If W gf is the weight of half meter rule, by the principle of moments,

W×(29−25)=20×(50−29)⇒W×4=20×21⇒W=20×214⇒W=105 gfW \times (29 - 25) = 20 \times (50 - 29) \\[0.5em] \Rightarrow W \times 4 = 20 \times 21 \\[0.5em] \Rightarrow W = \dfrac{20 \times 21}{4} \\[0.5em] \Rightarrow W = 105 \text{ gf}