978-0073398242 Chapter 4 Solution Manual Part 9

subject Type Homework Help
subject Pages 9
subject Words 1111
subject Authors Brian Self, David Mazurek, E. Johnston, Ferdinand Beer, Phillip Cornwell

Unlock document.

This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
page-pf1
page-pf2
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 4.69
A 50-kg crate is attached to the trolley-beam system shown.
Knowing that
1.5 m,a
determine (a) the tension in cable CD,
(b) the reaction at B.
page-pf3
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 4.70
One end of rod AB rests in the corner A and the other end is attached to
cord BD. If the rod supports a 150-N load at its midpoint C, find the
reaction at A and the tension in the cord.
page-pf4
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 4.71
For the boom and loading shown, determine (a) the tension in cord
BD, (b) the reaction at C.
Three-force body: 3-kip load and T intersect at E.
Geometry:
32
; 12 48
8 in.
BF CF BF
AG CG
BF

32 32 8 24 in.
48
; ; 36 in.
24 32
36 32 4 in.
BH BF
JE DJ JE JE
BH DH
EG JE JG
 


4 in.
tan 48 in.
4.7636
24 in.
tan 32 in.
36.870


Force Triangle
Law of sines:
3 kips
sin94.764 sin32.106 sin53.13
BD
TC


(a)
5.63 kips
BD
T
(b) 4.52 kips
C
4.76
page-pf5
PROBLEM 4.72
A 40-lb roller, of diameter 8 in., which is to be used on a tile floor, is
resting directly on the subflooring as shown. Knowing that the thickness
of each tile is 0.3 in., determine the force
P
required to move the roller
onto the tiles if the roller is (a) pushed to the left, (b) pulled to the right.
page-pf6
PROBLEM 4.73
A T-shaped bracket supports a 300-N load as shown. Determine
the reactions at A and C when α 45°.
page-pf7
PROBLEM 4.73 (Continued)
page-pf8
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 4.74
A T-shaped bracket supports a 300-N load as shown. Determine
the reactions at A and C when α 60°.
page-pf9
PROBLEM 4.74 (Continued)
page-pfa
PROBLEM 4.75
Rod AB is supported by a pin and bracket at A and rests against a frictionless
peg at C. Determine the reactions at A and C when a 170-N vertical force is
applied at B.
The reaction at A must pass through D where
C
and the 170-N force intersect.
160 mm
tan 300 mm
28.07

We note that triangle ABD is isosceles (since AC BC) and, therefore,
28.07CAD

Also, since
,CD CB
reaction
C
forms angle
28.07

with the horizontal axis.
Force triangle
We note that
A
forms angle
2
with the vertical axis. Thus,
A
and
C
form angle
180 (90 ) 2 90

  
Force triangle is isosceles, and we have
170 N
2(170 N)sin
160.0 N
A
C
170.0 N
A
33.9°; 160.0 N
C
28.1°


Trusted by Thousands of
Students

Here are what students say about us.

Copyright ©2022 All rights reserved. | CoursePaper is not sponsored or endorsed by any college or university.