Dynamics of Rigid Bodies The rotation of the 0.9-m arm OA about O is defined by the relation Eq. (1), where is θ expressed in radians and t in seconds. Collar B slides along the arm in such a way that its distance from O is Eq. (2), where r is expressed in meters and t in seconds. After the arm OA has rotated through 30°, determine the acceleration (m/s2).(Answer in 2 decimal places) θ = 0.15t2 is Eq'n (1) ; r = 0.9 - 0.12t2 is Eq'n (2)

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