Rotational MotionHard
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
Create a free account to view solution
View Solution FreeMore Rotational Motion Questions
A uniform disc of radius R lies in the x-y plane with its centre at the origin. Its moment of inertia about z axis is eq...Length, width and mass of a rectangular plate are l, b and m respectively. The radius of gyration about the axis passing...A ring of radius 3a is fixed rigidly on a table. A small ring whose mass is m and radius a, rolls without slipping insid...A uniform circular disc placed on a rough horizontal surface has initially velocity v0 and an angular velocity ω0 a...The analogues in rotatory motion of the quantities m, and in linear motion are...