A wheel of mass 11 kg is pulled up a step by a horizontal rope as depicted in Figure P8.81. If the height of the step is equal to one-third the radius of the wheel, h = 1/3 R, what minimum tension is needed on the rope to start the wheel moving up the step? The wheel will start to move just as the normal force on the very bottom of the wheel becomes zero.

Figure P8.81

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