The law of conservation of angular momentum gives
The initial moment of inertia of the system is given by
The final moment of inertia
"J_f=\\frac{1}{2}MR^2"Hence
"\\omega_f=\\frac{J_i}{J_f}\\omega_i=\\frac{\\frac{1}{2}MR^2+mr^2}{\\frac{1}{2}MR^2}\\omega_i""=\\frac{\\frac{1}{2}\\times 99\\times (1.9)^2+78\\times (1.9)^2}{\\frac{1}{2}\\times 99\\times (1.9)^2}\\times 0.26=0.67\\:\\rm rev\/s"
Comments
Very helpful, thank you! Also don't forget to convert rev/s to rad/s :)
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