•
•
•
,
• . ..
..J
.•
•
Nmne
____________________
__
Physics
Department
Duquesne University
.
PH21101
GAP I ,
"
, "
'.
Exam 3
'December 9, 2008
SHOW
YOUR
WORK
ON
ALL
PROBLEMS,
INCLUDING
MULTIPLE
CHOICE.
•
TIris
test
covers
Chapters
8 
10.
There
are
5 multiplechoice questions
worth
5 pointseach,
and
5
,
•
•
longanswer questions
worth
15
points
each
.
There
are
100
points possible.
Partial
credit
will
be
•
given,
but
only
if
you.
S~ow
your
work
and
yourreasomng is clear!!!
i
Moments
of
inertia

1.
solid
disk
(about
an
axis
through
its
center
and
perpendicular
to
the
plane
of
the
disk): 1
=
Y,
MR'
2,
rod
(about
an
axis
through its '
center
and
perpendicular
to
it) 1=1/12
MR'
•
,
1.
Two
particles
interact
by
conservative
forces
and

no
other
forces
act.
They
complete
round
.
·
~
trips, endinS,
at
the
points
where
they
started,
OV
,e,
this
trip:
•
C<n~y",,*,v.
>,Ie
"
~o'
:
6U::'O
~
,,"'t>,,;.
$~
Ai<=" ,

•
I

~
~~~
)
A)
the
total
kinetic
energy
might
have
a different
value
at
the
beginning
and
end

B)
the
total
potential energy
might
have a
differ¢nt
value
at
the beginning
and
end
I
C)
the
total
mechtmical
energy
might
bave
a
diff~~eDt
value
at
the
beginning
and
end
t
D
the
total linear
momenturi:l
might
have
different
'
values
at
the
beginning
and
end
i
r
E)
none
of
the
above
.
At!
=
0
~")
~~
~~~t
~
0
~
sus:~
·
t
.'
'
I
,
•
2.
As a
particle
moves aloilg
the
x
axis
it)s
acted
00
by
a conservative
force.
Tb,e
potential
.