Rotational Motion Question 156

Question: ABC is a uniform wire. If centre of mass of wire lies vertically below point A, then $\frac{BC}{AB}$ Disclose to:

Options:

A)1.85

B) 1.5

C)1.37

D) 3

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Centre of mass

$x _{cm}=\frac{x}{2}\frac{(\rho x)\left( \frac{x}{2} \right)\frac{1}{2}+\rho y\left( \frac{y}{2} \right)}{\rho (x+y)}\Rightarrow \frac{1}{2}+\frac{y}{x}=\frac{y^{2}}{x^{2}}$

$\therefore \frac{BC}{AB}=\frac{y}{2}$

$=\frac{1+\sqrt{3}}{2}=1.37$



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