Highly selective Backlog Qs for JEE MainPhysicsRotational Motion
Three particles, each of mass m gram, are situated at the vertices of an equilateral triangle ABC side l ~cm (as shown in the figure). The moment of inertia of the system about a line AX perpendicular to A B and in the plane of A B C , in gram cm ^2 units will be:
Options
- A3 4 m l^2
- B2 ml
- C5 4 m l^2
- D3 2 m l^2
Correct answer
C. 5 4 m l^2
Step-by-step solution
According to the question aligned I_ A X & =m l^2+m ( l 2 )^2 & =m l^2+ 5 4 & = 5 4 m l^2 aligned