The uniform sign has a weight of 1500 lb and is supported by the pipe ab, which has an inner radius of 2.75 in. and an outer radius of 3.00 in. if the face of the sign is subjected to a uniform wind pressure of p = 150 lb> ft2, determine the state of stress at points c and d. show the results on a differential volume element located at each of these points. neglect the thickness of the sign, and assume that it is supported along the outside edge of the pipe.