Thevalingam, Donald – Homework 12 – Due: Dec 21 2006, midnight – Inst: Eslami
1
This
printout
should
have
14
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
The due time is Central
time.
Please notice that the due date is on Thurs
day.
This assignment and the next one are
very heavily counted toward your grade if you
are exempt from the final exam.
001
(part 1 of 1) 10 points
An object travels 9 m in the first second of
travel, 9 m again during the second second of
travel, and 9 m again during the third second.
What is the approximate average accelera
tion of the object during this time interval?
1.
Unable to determine.
2.
5 m/s
2
3.
6 m/s
2
4.
0 m/s
2
correct
5.
4 m/s
2
6.
9 m/s
2
7.
8 m/s
2
8.
7 m/s
2
9.
3 m/s
2
Explanation:
Solution:
Because the distance traveled each second
is constant, its velocity is constant. Therefore,
the acceleration of the object is zero.
keywords:
002
(part 1 of 1) 10 points
A fourengine jet accelerates down the runway
at 8 m
/
s
2
.
If one of the jet engines fails, how much
acceleration will the other three produce?
Correct answer: 6 m
/
s
2
.
Explanation:
Since four engines produce an acceleration
of
a
, each produces onefourth of the origi
nal acceleration and three of the engines will
produce threefourths of the original acceler
ation.
keywords:
003
(part 1 of 1) 10 points
A car traveling initially at 7
.
7 m
/
s accelerates
at the rate of 0
.
899 m
/
s
2
for 3
.
3 s.
What is its velocity at the end of the accel
eration?
Correct answer: 10
.
6667 m
/
s.
Explanation:
Use the kinematic equation
v
f
=
v
0
+
a
Δ
t
keywords:
004
(part 1 of 2) 10 points
The electrons that produce the picture in a
TV set are accelerated by a very large electric
force as they pass through a small region in
the neck of the picture tube.
This region is
2 cm in length, and the electrons enter with a
speed of 100000 m
/
s and leave with a speed
of 1
.
5
×
10
8
m
/
s.
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 Spring '08
 Turner
 Physics, Acceleration, Work, Correct Answer, Thevalingam

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