Two point masses are rigidly connected by light rods to a common axis

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

Two point masses are rigidly connected by light rods to a common axis. Mass m1=0.20 kgm_1=0.20\,\text{kg} is 0.30 m0.30\,\text{m} from the axis, and mass m2=0.50 kgm_2=0.50\,\text{kg} is 0.10 m0.10\,\text{m} from the axis. What is the rotational inertia of the system about the axis? (a) 0.047 kg⋅m20.047\,\text{kg}\cdot\text{m}^2 (b) 0.0023 kg⋅m20.0023\,\text{kg}\cdot\text{m}^2 (c) 0.023 kg⋅m20.023\,\text{kg}\cdot\text{m}^2 (d) 0.018 kg⋅m20.018\,\text{kg}\cdot\text{m}^2

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