1.12 The frame shown consists of four wooden members, ABC, DEF, BE, and CF. Knowing that...

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1.12 The frame shown consists of four wooden members, ABC, DEF, BE, and CF. Knowing that each member has a 2 X 4-in. rectan- gular cross section and that each pin has a -in. diameter, deter- mine the maximum value of the average normal stress (a) in member BE, (b) in member CF. 40 in. A D-15 in.- Fig. P1.12 45 in. 4 in. 30 in. B 4 in. 30 in. 480 lb 1.12 The frame shown consists of four wooden members, ABC, DEF, BE, and CF. Knowing that each member has a 2 X 4-in. rectan- gular cross section and that each pin has a -in. diameter, deter- mine the maximum value of the average normal stress (a) in member BE, (b) in member CF. 40 in. A D-15 in.- Fig. P1.12 45 in. 4 in. 30 in. B 4 in. 30 in. 480 lb