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d₂ = 2d₁
Dit: I₂....?
jawab:
I = md²
I₁/I₂ = d₁²/d₂²
I₁/I₂ = d₁²/(2d₁)²
I₁/I₂ = d₁²/4d₁²
I₁/I₂ = 1/4
I₂ = 4I₁
momen inersia kedua adalah 4x momen inersia pertama.