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Answers to selected problems Homework 1 Problem 2: T BC = 63 . 23 kN. Problem 4: A ˆ DC = 62 . 8 o . Problem 6: M y = 1 . 16 ft. lb. Problem 8: M = 51 . 17 N m. Homework 2 Problem 2: R Ax = - 1500 lb ; R Ay = - 750 lb ; R C = 750 lb Problem 4: T CE = 209 N ; R A = 161 N ; R D = 100 N . Problem 6: R A = 5 . 71 lb (horiz) , 22 . 86 lb (vert), R A = 14 . 29 lb (horiz) , 17 . 14 lb (vert), R C = 20 lb. Problem 8: R = { 0 , 0 , F } ; M = { FL , - FL , 0 } . Homework 3 Problem 2: μ = 0 . 622. Problem 4: F AB = - 1 . 486 kN (compression) ; F AC = 0 . 738 kN (tension) F BC = 3 . 714 kN (tension) F BD = - 4 kN (compression) ; F CD = 2 . 228 kN (tension) F CE = 2 . 584 kN (tension) ; F DE = - 5 . 199 kN (compression) . Problem 6: F E = 726 N . Problem 7: R E = 800 N . Homework 4 Problem 2: R A = 11 / 6 kN, M A = 1 kN m. Problem 4: R = {- 5 , 0 , 10 } kN, M x = 10 kNm (torque), M y = - 20 kNm (bending mo- ment), M z = 5 kNm (bending moment). Problem 6: In BC , V ( x ) = 450 lb, M ( x ) = 450 x - 2450 lb ft. Problem 8: M max is at D and of magnitude 31.25 kN m. 1

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Homework 5 Problem 2: d min = 2 . 7 in. Problem 4: 1174 meters. Homework 6 Problem 2: G = 5 . 95 GPa. Problem 4: Δ d = - 0 . 15 × 10 - 3 mm. Δ V / V = 0 . 5 × 10 - 3 . Homework 7 Problem 2: u C = 0 . 424 in, u D = 0 . 0084 in, u E = 0 . 00173 in.
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