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Two thin discs, each of mass  and radius m, are attached as shown in Figure, to form a rigid body. The rotional inertia of this body about an axis perpendicular to the plane of disc  passing through its centre is

a)

b)

c)

4

d)


Question ID - 100368 | Top Ranker Answer | SaraNextGen

Two thin discs, each of mass  and radius m, are attached as shown in Figure, to form a rigid body. The rotional inertia of this body about an axis perpendicular to the plane of disc  passing through its centre is

a)

b)

c)

4

d)

1 Answer - 5876 Votes

3537

Answer Key : (d) -

(d)

Moment of inertia of discs  and  about the axis through their centre of mass and perpendicular to the plane will be

Now, moment of inertia of disc  about an axis through  by theorem of parallel axis will be

So



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