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Q.

Three identical rods, each of mass m and length l, form an equilateral triangle. Moment of inertia about one of the sides is

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a

ml24

b

ml2

c

3ml24

d

ml22

answer is D.

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Detailed Solution

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For first and second rod , take effective length =lsin600

I=I1+I2+I3=mlsin60023+mlsin60023+0=ml22

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Three identical rods, each of mass m and length l, form an equilateral triangle. Moment of inertia about one of the sides is