Question

what is moment of inertia of a straight rod

Answer 1

moment of inertia of a street rod about an Axis through its Centre is m/l dx
(M/Ldx)x2

on solving
we get

ML/12


hope it helps !

Answer 2

$\huge\blue{As-Salamu-Alykum}$

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$\huge\green{Moment of inertia of straight rod :- }$

I = 1/12ML^2

$\huge\purple{Moment of inertia of other various bodies :-}$

Ring or thin walled cylinder :-

I = MR^2

Solid sphere :-

I = 2/5 MR^2

Disc or solid cylinder :-

I=1/2MR^2

Disc:-

I=1/2M(R2^2_R1^2)

Rectangular plate :-

I=1/2M(a^2 + b^2)

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$\huge\orange{INSHALLAH it will help U}$