ω==kmRrrRkm22/.(b) If r= Rthe result of part (a) reduces to =km/.(c) And if r= 0 then = 0 (the spring exerts no restoring torque on the wheel so that it is not brought back towards its equilibrium position). 84. (a) The rotational inertia of a hoop is I= mR2, and the energy of the system becomes EIkx=+1212andθis in radians. We note that r= v(where v
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