15
Engineering Physics 1 (Phys. 213)
Practice Exam 1 SOLUTION, Feb. 8
th
, 2008 (O’Shea)
Name
__________________________________
Instructions: Please Read!
This is a closed book, closed notes exam. This exam contains multiplechoice questions
and problems.
For each multiplechoice question, circle the letter of the best response.
For problems, you need to show your work in a professional manner and write the final
numerical answer with the proper unit in the space shown. Numerical answers without
supporting calculations will receive zero credit. Partial credit is available only if your
work is clear.
1.
Academic honesty statement.
This exam will NOT be marked unless you sign the academic honesty statement below.
Your signature indicates that you have
read
,
understood
, and
complied
with the
meaning of this statement.
On my honor as a student I have neither
given nor received unauthorized aid on
this assignment.
Sign your name:__________________________________________________________
2.
(1 point) Circle
your Studio instructor/hour:
Lynch /TU 9:30
Matloob /TU 11:30
Regehr /TU 1:30
O’Shea/WF 7:30
Lynch /WF 9:30
See practice exam for equation sheet
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3.
A car travels on a straight road for 20 km at 40 km/h. It then continues in the same
direction for 1.0 hours at 60 km/h.
What is the average velocity of the car during the complete trip? (Assume that it moves in
the positive x direction.)
Δ
t
1
=
Δ
x
1
/v
1
Δ
x
2
=
v
2
Δ
t
2
= (20 km)/(40 km/h) = 0.5 h
= (60 km)(1 h) = 60 km
Since both displacements are in the same direction,
Δ
x
=
Δ
x
1
+
Δ
x
2
= 20 km + 60 km = 80 km.
The total time for the trip is
Δ
t
=
Δ
t
1
+
Δ
t
2
= 1.5 h.
Therefore the average velocity is
v
avg
=
Δ
x/
Δ
t
= (80 km)/(1.5 h) = 53 km/h
b) The car now travels on a straight road for 20 km at 40 km/h. It then travels in the
opposite direction for 1.0 hours at 60 km/h.
Is the average velocity
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 Spring '08
 oshea
 Physics, Acceleration, Velocity, Lynch, vy, Phys.

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