This preview shows pages 1–3. Sign up to view the full content.
EAS 208 (Fall 2010)
Homework #9
Due:
Wednesday, December 8 at beginning of class
Study:
Chapters 18, 21.1 – 21.3 (Bedford and Fowler, 5
th
edition)
Solve Problems:
18.50, 18.60, 18.66, 18.68, 21.63
Solve and Submit Problems 9–1, 9–2, and 9–3 below
Problem 9–1
At the instant shown, for the system consisting from the slender bar and the crate
connected with the rope (red line), the velocity of the crate is zero and the acceleration of
the crate is
2
14
ft
s
toward the left. The weights of the bar and the crate are
and
, respectively. Assume that between the horizontal surface and the crate the
coefficient of kinetic friction is
40
lb
80
lb
0.2
k
μ
=
. Determine:
a)
The couple
M
.
b)
The tension in the rope.
Neglect the weight of the rope (red line).
1
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentProblem 9–2
Let
θ
be the angular displacement of the disk relative to its position when both springs
are unstretched. The moment of inertia of the stepped disk is
2
4
O
I
kg
m
=−
and
0.4
R
m
=
. The stiffness of the linear springs is
This is the end of the preview. Sign up
to
access the rest of the document.
 Fall '08
 MehdiAhmadizadeh

Click to edit the document details