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  4. The two bodies of mass 1 kg and 2 kg are attached to the ends of a 2 metre long weight less rod. This system is rotating about an axis passing through middle point of rod. Calculate MI of system

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Q. The two bodies of mass $1 \,kg$ and $2\, kg$ are attached to the ends of a $2$ metre long weight less rod. This system is rotating about an axis passing through middle point of rod. Calculate MI of system

Solution:

$I=I_{1}+I_{2}$
$=1 \times 1^{2}+2 \times 1^{2}=3\, kg M^{2}$