This preview shows pages 1–3. Sign up to view the full content.
EM 319 Mechanics of Solids
Spring 2011
Exam #1
February 15
th
2011, 7:009:30 pm
Closed books, notes and homeworks
Name:
EID:
TA Session:
Vishal Nayyar
W 46 pm
13900
Wei Gao
TH 46 pm
13905
Adam Sierakowski
W 68 pm
13910
Andrew Barnes
TH 68 pm
13915
Formulas:
A
P
,
L
,
E
,
,
T
T
TL
EA
PL
,
dx
x
T
dx
x
EA
x
N
)
(
)
(
)
(
bx
a
b
dx
bx
a
1
1
2
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
(20 points)
A steel bar
AD
(see Fig. 1) has a crosssectional area of 0.40 in.
2
and is loaded by forces
P
1
= 2700
lb,
P
2
= 1800 lb, and
P
3
= 1300 lb. The lengths of the segments of the bar are:
a =
60 in.,
b
= 24 in.,
and
c
= 36 in.
a.
Assuming that the modulus of elasticity
E
= 30 x 10
6
psi, calculate the change in
length of the bar. Does the bar elongate or shorten?
b.
By what amount P should the load
P
3
be increased so that the bar does not change in
length when the three loads are applied?
Fig. 1
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 12/14/2011 for the course EM 319 taught by Professor Kennethm.liechti during the Fall '08 term at University of Texas at Austin.
 Fall '08
 KennethM.Liechti

Click to edit the document details