Rotational MotionMedium
Question
The axis X and Z in the plane of a disc are mutually perpendicular and Y-axis is perpendicular to the plane of the disc. If the moment of inertia of the body about X and Y axes is respectively 30 kg m2 and 40 kgm2 then M.I. about Z-axis in kg m2 will be : -
Options
A.70
B.50
C.10
D.zero
Solution
Plane of disc is (X - Z)
∴ Iy = Ix + Iz ⇒ 40 = 30 + Iz ∴ Iz = 10
∴ Iy = Ix + Iz ⇒ 40 = 30 + Iz ∴ Iz = 10
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