Rotational MotionHard
Question
Two disc one of density 7.2 g/cm3 and the other of density 8.9 g/cm3 are of same mass and thickness. Their moments of inertia are in the ratio : -
Options
A.
B.
C.(8.9 × 7.2) : 1
D.1 : (8.9 × 7.2)
Solution
I1 = 
I2 =
∴ 
Mass = Density × Area
7.2 × πR12 = 8.9 × π R22 ⇒
I2 =
∴ Mass = Density × Area
7.2 × πR12 = 8.9 × π R22 ⇒
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