TS EAMCET · Physics · Rotational Motion
A metre stick is balanced on a knife edge at its centre. When four coins, each of mass \(2 \mathrm{~g}\) are put one on top of the other at \(10.0 \mathrm{~cm}\) mark, the stick it found to be balanced at \(46.0 \mathrm{~cm}\) mark. The mass of the metre stick is
- A 66 g
- B 60 g
- C 72 g
- D 18 g
Answer & Solution
Correct Answer
(C) 72 g
Step-by-step Solution
Detailed explanation
\begin{aligned} & \text { As } \mathrm{J}_{\mathrm{CW}}=\mathrm{J}_{\mathrm{ACW}} \\ & \Rightarrow \quad \mathrm{mg} \times 4=8 \times 10^{-3} \mathrm{~g} \times 36 \\ & \Rightarrow \quad 4 \mathrm{~m}=8 \times 10^{-3} \times 36 \\ & \Rightarrow \quad \mathrm{m}=72 \times…
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