System of Particles and Rotational Motion - Result Question 64

71. The moment of inertia of a disc of mass M and radius R about an axis, which is tangential to the circumference of the disc and parallel to its diameter, is

[1999]

(a) 32MR2

(b) 23MR2

(c) 54MR2

(d) 45MR2

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Answer:

Correct Answer: 71. (c)

Solution:

  1. (c) Moment of inertia of disc about its diameter is Id=14MR2

MI of disc about a tangent passing through rim and in the plane of disc is

I=Id+MR2=14MR2+MR2=54MR2



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