A hexagonal framework ABCDEFA is fabricated from six identical rods each of mass m and length l. Then moment of inertia of the framework about the diagonal AD is
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a
52ml2
b
32ml2
c
2ml2
d
72ml2
answer is A.
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Detailed Solution
IAD=22 x 13ml2sin260o+m(l sin60o)2⇒IAD=212ml2+34ml2=52ml2
A hexagonal framework ABCDEFA is fabricated from six identical rods each of mass m and length l. Then moment of inertia of the framework about the diagonal AD is