77777
77777
Instructor(s):
Matcheva/Sabin
PHYSICS DEPARTMENT
PHY 2048
Final Exam
April 24, 2010
Name (print, last ﬁrst):
Signature:
On my honor, I have neither given nor received unauthorized aid on this examination.
YOUR TEST NUMBER IS THE 5DIGIT NUMBER AT THE TOP OF EACH PAGE.
(1)
Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5digit number)
.
Code your name on your answer sheet.
DARKEN CIRCLES COMPLETELY
. Code your UFID number on your
answer sheet.
(2) Print your name on this sheet and sign it also.
(3) Do all scratch work anywhere on this exam that you like.
Circle your answers on the test form.
At the end of the
test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout.
(4)
Blacken the circle of your intended answer completely, using a #2 pencil or blue
or black
ink
. Do not make
any stray marks or some answers may be counted as incorrect.
(5) The answers are rounded oﬀ. Choose the closest to exact. There is no penalty for guessing.
(6)
Hand in the answer sheet separately.
Where needed use
g
= 9
.
80 m/s
2
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1. A motorist is driving along a straight road at a constant speed of 60 m/s. At time
t
= 0 she passes a parked motorcycle
police oﬃcer and begins to accelerate at a constant acceleration
a
. The oﬃcer takes oﬀ after her at
t
= 0 and accelerates
at a constant acceleration of 2
a
. What is the speed of the police oﬃcer when he reaches the motorist?
(1) 240 m/s
(2) 180 m/s
(3) 160 m/s
(4) 120 m/s
(5) need to know
a
2. If
~
A
·
~
B
=

~
A
×
~
B

and neither
~
A
or
~
B
is zero, then the angle between them is:
(1) 135
◦
(2) 45
◦
(3) 0
◦
(4) 180
◦
(5) 150
◦
3. Near the surface of the Earth, a shell with mass
M
is shot with an initial
velocity
~v
0
, at an angle of
θ
0
with the horizontal as shown in the ﬁgure. At the
top of the trajectory, the shell explodes into two fragments with mass
m
1
and
m
2
(
M
=
m
1
+
m
2
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 Summer '08
 Field
 Physics, Kinetic Energy, Mass, Velocity, m/s

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