5-61
5-62
5-63
5-64
5-65
5-66
5-67
5-68
5-69
5-71
5-73
5-74
5-75
5-76
5-77
Remove the extension arm and replace with a moment of 120 N-m and an 800-lb force at the right end.
800 lb 800 lb
The 800 lb force on the vertical
arm must be resisted by an equal and
opposite force at its base, along with a
CCW moment to keep it in linear and
rotational equilibrium.
800 lb
MC = (800 lb)(0.15 m) = 120 N m
The pair of 800 lb forces create
a clockwise couple that must be
resisted by the
counterclockwise moment
where the arm joins the
a force of 800 lb.
NOTE: This solution is presented in high detail to demonstrate the process of analyzing this type of
member. Following problems include less detail, but use the same basic methodology.
A
B
C
Vertical
arm
5-78
Remove the extension arm and replace with the moment and force exerted by the arm.
250 lb
250 lb Moment, MB
250 lb
2.75 in
250 lb
A
B
C
B
1.2 kN
50 mm
Segment A-B is in tension with a
force of 1.2 kN.
5-80
400 lb
400 lb
400 lb
2.6 in
400 lb
A
B
C
B