AIIMS2008PhysicsRotational Motion
Side of an equilateral triangle is (l ). Three point masses, each of magnitude (m ), are placed at the three vertices of the triangle. Moment of inertia of this system about one side of the triangle as axis is given by
Options
- A( 3 m l^2 4 )
- B( 4 3 m l^2 )
- C( 3 2 m l^2 )
- D( 2 3 m l^2 ).
Correct answer
A. ( 3 m l^2 4 )
Step-by-step solution
Distance of corner mass from opposite side =r aligned & r^2=l^2- ( l 2 )^2= 3 l^2 4 & I=m r^2= 3 4 m l^2 aligned