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1 Calculate the moment‐of‐inertia J of a solid cylinder that is free to rotate about its axis, as shown in Fig. 2-6a, in terms of its mass M and the radius r1.

2 Given that a solid steel cylinder has a radius r1 = 6 cm, length ℓ = 18 cm, and material density ρ = 7.85 × 103 kg/m3, calculate its moment‐of‐inertia J.