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Version One – Homework 1 – savrasov – 39822 – Sep 28, 2007
1
This
printout
should
have
11
questions.
Multiplechoice questions may continue on
the next column or page – fnd all choices
beFore answering.
The due time is Central
time.
Jet in Flight
02:02, trigonometry, numeric,
>
1 min, nor
mal.
001
(part 1 oF 3) 1 points
A jet travels at 400 m
/
s.
How long does it take to travel 200 m?
Correct answer: 0
.
5 s.
Explanation:
s
=
vt
, so
t
=
s
v
.
Dimensional analysis
For
t
1
:
m
÷
m
s
= m
·
s
m
= s
so the units are compatible.
002
(part 2 oF 3) 1 points
How long to travel 5 km?
Correct answer: 12
.
5 s.
Explanation:
Dimensional analysis
For
t
2
:
km
÷
m
s
= km
·
s
m
·
1000 m
1 km
= 1000 s
003
(part 3 oF 3) 1 points
How long to travel 5 in
.
?
Correct answer: 0
.
0003175 s.
Explanation:
Dimensional analysis
For
t
3
:
in
÷
m
s
= in
·
s
m
·
2
.
54 cm
1 in
·
1 m
100 cm
= s
keywords:
Average Velocity on a Trip
02:03, trigonometry, numeric,
>
1 min, nor
mal.
004
(part 1 oF 1) 1 points
A car travels along a straight stretch oF road.
It proceeds For 14
.
5 mi at 55 mi
/
h, then
22
.
5 mi at 45 mi
/
h, and fnally 30
.
5 mi at
35 mi
/
h.
What is the car’s average velocity during
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 Fall '09
 RichardScalettar
 Work, Light

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