The slotted wheel rolls to the right without slipping, with a constant speed v = 2.1 ft/sec of its center O. Simultaneously, motion of the sliding block A is controlled by a mechanism not shown so that x Overscript dot EndScripts = 1.9 ft/sec with x Overscript two-dots EndScripts = 0. Determine the magnitude of the acceleration of A for the instant when x = 6.5 in. and θ = 37°