Question
Question: Five particles of mass = 2 kg are attached to the rim of a circular disc of radius 0.1 m and negligi...
Five particles of mass = 2 kg are attached to the rim of a circular disc of radius 0.1 m and negligible mass. Moment of inertia of the system about the axis passing through the centre of the disc and perpendicular to its plane is
A
1 kg m2
B
0.1 kg m2
C
2 kg m2
D
0.2 kg m2
Answer
0.1 kg m2
Explanation
Solution
We will not consider the moment of inertia of disc because it doesn't have any mass so moment of inertia of five particle system I=5mr2=5×2×(0.1)2=0.1kg⥂−⥂m2.