The accompanying figure shows part of a common type of roof trUSs, constructed mainly of timber and steel rods. Determine: a. The average compressive stress in the 8" x 8" diagonal member if the load in it is 25 kips. b. The tensile stress in the 3/4-inch diameter threaded steel rod if the load in it is 5 kips. c. The bearing stress between the timber and the 4" x 4" square steel washer if the hole in it is 7/8- inch

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