{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW15-Solution

# HW15-Solution - HW15 Solution Terry Cooke Cal Poly San Luis...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: HW15 - Solution Terry Cooke: Cal Poly San Luis Obispo Chapter 6, Solution 76 We note that BD is a two-force member. The force it exerts on ABC, therefore, is directed along the BD. Free body: ABC Attaching FBD at D and resolving it into components, we write MC 0: (400 N)(135 mm) 450 FBD (240 mm) 510 FBD 0 255 N FBD 255 N C Fx 0: C x 240 ( 255 N) 510 Cx 0 120.0 N Cx 120.0 N Fy 0: C y 400 N 450 ( 255 N) 510 0 Cy 625 N Cy 625 N Chapter 6, Solution 93 Free-body: Pipe 2 W (30 lb/ft)(7.5 ft) 225 lb F 8 D 17 225 lb 15 F 120 lb D 255 lb Geometry of pipe 2 By symmetry: Equate horizontal distance: r r CF 4.5 in. CD (1) 8 r 17 25 r 17 CD CD CD 15 17 15 17 25 5 r r 15 3 From Eq. (1): CF CF 5 5 r (4.5 in.) 3 3 7.5 in. Free-body: Member CFG MC 0: (120 lb)(7.5 in.) Gx (16 in.) Gx 0 56.25 lb Gx 56.3 lb Free body: Frame and pipes PROBLEM 6.93 (Continued) Note: Pipe 2 is similar to pipe 1. AE CF 7.5 in. E F 120 lb MA 0: G y (15 in.) (56.25 lb)(24 in.) (225 lb)(4.5 in.) (225 lb)(19.5 in.) (120 lb)(7.5 in.) Gy 0 510 lb Gy 510 lb Fx 0 : Ax 120 lb 56.25 lb Ax 0 176.25 lb Ax 176.3 lb Fy 0 : Ay 510 lb 225 lb 225 lb Ay 0 60 lb Ay 60.0 lb Chapter 6, Solution 95 (a) Free body: Trailer (We shall denote by A, B, C the reaction at one wheel) MA 0: (2400 lb)(2 ft) D(11 ft) 0 D Fy 0 : 2 A 2400 lb 436.36 lb 436.36 lb 0 A 982 lb A 981.82 lb Free body: Truck MB 0: (436.36 lb)(3 ft) (2900 lb)(5 ft) 2C (9 ft) 0 C Fy 732.83 lb 0 C 733 lb 0 : 2 B 436.36 lb 2900 lb 2(732.83 lb) B 935.35 lb B 935 lb (b) Additional load on truck wheels Use free body diagram of truck without 2900 lb. MB 0: (436.36 lb)(3 ft) 2C (9 ft) 0 C Fy 0 : 2 B 436.36 lb 2(72.73 lb) B 72.73 lb 0 290.9 lb C 72.7 lb B 291 lb ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online