Question
Physics Question on rotational motion
Radius of gyration of disc of mass 50 g and radius 2.5 cm about an axis passing through its center of gravity and perpendicular to the plane is
A
6.54 cm
B
3.64 cm
C
1.77 cm
D
0.88 cm
Answer
1.77 cm
Explanation
Solution
Here mass M = 50 g and radius R = 2.5 cm Required moment of inertia of the disc is given by I=2MR2=MK2 so,K2=2R2orK=2R=22.5=22.52 = 1.767= 1.77 cm