$1.$ Determine the average normal stress developed at points $A,B,$ and $C.$ The diameter of each

segment is indicated in the figure.

During the tension test, the wooden specimen is subjected to an average normal stress of $2$ ksi $.$

$2.$ Determine the axial force $P$ applied to the specimen. Also, find the average shear stress developed

along section $a-a$ of the specimen.

$3.$ The yoke$-$and$-$rod connection is subjected to a tensile force of $5$ kN $.$ Determine the average normal

stress in each rod and the average shear stress in the pin A between the members.