Assignment 3
ES230
Key solutions
Problem 3.1
A 90-N force is applied to the control rod AB as shown. Knowing that the
length of the rod is 225 mm, determine the moment of the force about
point B by resolving the force into components along AB and in a
dir

Engineering 250 - Statics
Exam#2 (1012512010)
Warrior
n+
frar/rn
f
.
Show your work (you need to support your answers, right or wrong, with the work that leads to those
answers). Each problem is equally weighted in the overall exam grade.
1. Determine the

Irlame:
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ME 2364-O0L.Statics. Test 2.
There are three problems. A referencesheet is attachecito the last page.
Show all your work and try to adhere to the standards of numeracy that we
havediscussed.Good luck.
1. A tugboat exerts a force of 6 kl

PROBLEM 5.1
Locate the centroid of the plane area shown.
SOLUTION
A, in 2
x , in.
y , in.
xA, in 3
yA, in 3
1 2
8 6 = 48
16 12 = 192
-4
9 6
-192
432 1152 1584
8
1536 1344
240
xA 1344 in 3 = A 240 in 2 yA 1584 in 3 = A 240 in 2
Then
X = Y =
or X = 5.60 in

PROBLEM 6.1
Using the method of joints, determine the force in each member of the truss shown. State whether each member is in tension or compression.
SOLUTION
FBD Truss:
M B = 0: ( 6.25 m ) C y - ( 4 m )( 315 N ) = 0
Fy = 0: By - 315 N + C y = 0
C y = 24