Questions
A thin wire AB of length l and mass m is bent in the form of a semicircle as shown in fig. Its moment
of inertia about an axis joining its free ends will be
a
ml2
b
Zero
c
ml2/π2
d
ml2/2π2
detailed solution
Correct option is D
Here, πr=l or r=l/πThe moment of inertia of a ring about its diameter is given by I=12Mr2∴Moment of inertia of semicircle=12mlπ2=ml22π2Talk to our academic expert!
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Two discs have mass ratio 1 : 2 and diameter ratio 2 : 1, then find the ratio of their moments of inertia.
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