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The moment of inertia of a thin rod about an axis passing through its mid point and perpendicular to the rod is 2400 g cm2 . The length of the 400 g rod is nearly:

Option 1 -

8.5 cm

Option 2 -

17.5 cm

Option 3 -

20.7 cm

Option 4 -

72.0 cm

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    2 months ago
    Correct Option - 1


    Detailed Solution:

    Moment of inertia of r o d = I = m l 2 1 2

    ⇒ 2 4 0 0 = 4 0 0 l 2 1 2

    ⇒ 7 2 = l 2

    ⇒l=72=8.48 cm=8.5 cm

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