Two shafts AC and CF, which lie in the vertical xy plane, are connected by a universal joint at C. The bearings at B and D do not exert any axial force. A couple of magnitude 50 N ˆ™ m (clockwise when viewed from the positive x axis) is applied to shaft CF at F. At a time when the arm of the crosspiece attached to shaft CF is horizontal, determine

(a) The magnitude of the couple which must be applied to shaft AC at A to

maintain equilibrium,

(b) The reactions at B, D, and E.