The Appendix ESUPPLEMENTAL assignment is worth 40 points.
Each problem is worth 8
points.
Comments on particular exercises are provided below.
1.
Many people know that the weight of an object varies on different planets, but did you know that
the weight of an object on earth also varies according to the elevation of the object? In particular,
the weight of an object follows this equation:
C
w
r
=

2
, where C is a constant, and r is the
distance that the object is from the center of the earth.
a.
Solve the equation
C
w
r
=

2
for r.
.
is
answer
the
So,
situation.
in this
number
positive
a
be
must
r
because
Reject
or
1
2
2
2
w
C
r
w
C
r
w
C
r
w
C
r
r
w
C
C
w
r
C
w
r
=

=

=
=
=
=
=

I deducted 2 points.
You did not identify the negative solution as a possible answer.
b.Suppose that an object is 75 pounds when it is at sea level. Find the value of C that makes the equation
true. (Sea level is 4,000 miles from the center of the earth.)
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000
1,200,000,
)
4000
(
75
)
4000
(
75
2
2
2
=
=
=
=

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 Spring '10
 Wethanad
 Oceanography, Algebra, sea level, Fort Collins, Above mean sea level

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