Question

Three particles, each of mass $m$ gram, are situated at the vertices of an equilateral triangle $ABC$ of side $l$ cm (as shown in the figure). The moment of inertia of the system about a line $AX$ perpendicular to $AB$ and in the plane of $ABC$, in $gram-cm^2$ units will be

• A. $\frac{3}{4}ml^2$
• B. $2ml^2$
• C. $\frac{5}{4}ml^2$
• D. $\frac{3}{2}ml^2$

Answer 1

Answer: (C)

$\frac{5}{4}ml^2$

Answer 2