NTA Abhyas JEE Main2020PhysicsRotational MotionPractice
The moment of inertia of a door of mass m , length 2 ℓ and width ℓ about its longer side is
Options
- A1 1 m ℓ 2 2 4
- B5 m ℓ 2 2 4
- Cm ℓ 2 3
- DNone of these
Correct answer
C. m ℓ 2 3
Step-by-step solution
I about YY ′ = m ℓ 2 1 2 Using parallel axis theorem : I (about AD) = m ℓ 2 1 2 + m ℓ 2 4 = m ℓ 2 3