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A rod of mass m and length 2R can rotate about an axis passing through O invertical plane. A disc of mass m and radius R is hinged to the other end P of the rodand can freely rotate about P. When disc is at lowest point both rod and disc hasangular velocity ω. If rod rotates by maximum angle θ = 60° with downward vertical,then find ω in terms of R and g. (all hinges are smooth)

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