Statics_Answers_2009_10_16

Statics_Answers_2009_10_16 - Engineering Mechanics: Statics...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Engineering Mechanics: Statics 1e Plesha, Gray, Costanzo Answers to Selected Even-Numbered Problems Chapter 1 1.2 Answers given in problem statement. 1.4 (a) l D 25:4 m; (b) m D 53:4 kg; (c) F D 11:4 kN; (d) I mass D 2:60 N m s 2 . 1.6 (a) l D 60:2 in : ; (b) m D 4:46 slug; (c) F D 20:1 lb; (d) M D 291 in : lb : 1.8 (a) p D 3:63 lb = in : 2 ; (b) E D 29:0 10 6 lb = in : 2 ; (c) I area = 5:65 in : 4 ; (d) I mass = 109 in : lb s 2 . 1.10 m D 0:115 kg : 1.12 g theory D 9:822 m = s 2 : 1.14 F D 2:02 10 14 N : 1.16 (a) D 65:7 kN = m 3 , D 6:70 10 3 kg = m 3 ; (b) D 20:9 kN = m 3 , D 2:13 10 3 kg = m 3 ; (c) D 0:314 kN = m 3 , D 32:0 kg = m 3 ; (d) D 21:4 kN = m 3 , D 2:19 10 3 kg = m 3 . 1.18 0:217 lb. 1.20 (a) D 0:621 rad; (b) D 0:0188 mrad; (c) D 266 ; (d) D 0:0146 . Chapter 2 2.2 (a) E R D 255 mm @ 36:0 ; (b) E R D 1:10 kip @ 142 . 2.4 (a) E R D 6:32 m @ 71:6 ; (b) E R D 7:21 m @ 56:3 ; (c) E R D 17:0 m 2 @ 45:0 ; (d) E R D 1:41 @ 45:0 . 2.6 D 16:0 or 104 . 2.8 F D 1:60 kN, D 90 . 2 kN a 3 kN sin 60 Possible choices for F . 2 kN sin 30 60 30 a 3 kN 2.10 (a) 364 N @ 147 ; (b) 239 N @ 257 ; (c) P D 607 N; (d) D , P D 304 N. 1 Last modified: October 16, 2009 Engineering Mechanics: Statics 1e Plesha, Gray, Costanzo 2.12 D 60 , F 1 D 246 N. 2.14 (a) j E F a j D 25:9 lb, j E F b j D 96:6 lb; (b) j E F a j D 29:9 lb ; j E F b j D 112 lb. 2.16 D 90 , F OC D 200 lb. 2.18 E R D . 18 O { C 35 O |/ kN. 2.20 E F D 1:60 O | kN. 2.22 (a) E R D . 304 O { C 200 O |/ N; (b) E R D . 53:6 O { 233 O |/ N; (c) P D 607 N; (d) D , P D 304 N. 2.24 D 60 , F 1 D 246 N, E F 1 D . 213 O { C 123 O |/ N. 2.26 (a) E r AB D .4 O { 3 O |/ m; (b) E r BA D . 4 O { C 3 O |/ m; (c) O u AB D 4 5 O { 3 5 O | ; (d) O u BA D 4 5 O { C 3 5 O | ; (e) E F AB D .9:6 O { 7:2 O |/ kN; (f) E F BA D . 9:6 O { C 7:2 O |/ kN. 2.28 E R D . 93:6 O { C 541 O |/ N, j E R j D 549 N, E R D 549 N @ 99:8 . 2.30 F 2 =F 1 D 1:50 . 2.32 D 33:7 , R D 6:42 kN. 8 kN 12 kN y x Possible choices for F R O A 2.34 (a) Not safe; (b) Safe (the working load multiplier is 70%, determined using linear interpolation); (c) Safe (the working load multiplier is 96%, determined using linear interpolation). 2.36 R x D 100 N, R y D 200 N, R t D 13:40 N, R n D 223:2 N. 2.38 (a) R x D 213 N, R y D 51:7 N; (b) R t D 187 N, R n D 114 N. 2.40 E r AB D . 20 O { C 48 O |/ mm, x B D 165 mm, y B D 48 mm. 2.42 E r AC D . 50 O { C 120 O |/ mm, x C D 135 mm, y C D 120 mm. 2.44 E r OA D .95 O { C 56 O |/ mm ; E r OB D .68 O { C 92 O |/ mm ; E r OC D .17 O { C 160 O |/ mm ;x B D 68 mm ;y B D 92 mm : 2.46 E F D . 4:59 O { C 26:8 O | C 12:6 O k/ lb, E Q D .39:8 O { C 30:0 O | 33:4 O k/ lb, E P D .50:0 O { 70:7 O | C 50:0 O k/ lb, E R D .85:2 O { 13:9 O | C 29:2 O k/ lb....
View Full Document

Page1 / 28

Statics_Answers_2009_10_16 - Engineering Mechanics: Statics...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online