*4-68. The pipe assembly is secured on the wall by the two brackets. If the flower pot has a weight of 50 lb, determine the magnitude of the moment produced by the weight about the OA axis. 4-69. The pipe assembly is secured on the wall by the two brackets. If the frictional force of both brackets can resist a maximum moment of 150 lb ft, determine the largest weight of the flower pot that can be supported by the assembly without causing it to rotate about the OA axis. x 4 ft 3 ft 60° 4 ft 3 ft B 30° Probs. 4-68/69