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Appendix E mat 117

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Axia College Material
Appendix E
Radicals
Application Practice
Answer the following questions. Use Equation Editor to write mathematical expressions and equations.
First, save this file to your hard drive by selecting Save As from the File menu. Click the white space
below each question to maintain proper formatting.
Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in
this assignment. You can use 1 mile = 5,280 feet for your conversions.
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:
2
= Crw
, where C is a constant, and r is the
distance that the object is from the center of Earth.
a. Solve the equation
2
=
Crw
for r.
1
r
2
w=
C
r
2
r
2
=
C
w
r can only be a positive value because it represent the distance between object and Earth:
r=
C
w
b. Suppose that an object is 50 pounds when it is at sea level. Find the value of C that
makes the equation true. (Sea level is 3,963 miles from the center of the Earth.)
We are given r=3963 and w=50. So we solve the equation for C using this information:
r
2
=
C
w
C=wr
2
C=50×3963
2
C
¿ 785268450
c. Use the value of C you found in the previous question to determine how much the object
would weigh in
i. Death Valley (282 feet below sea level). Round to 3 decimal places (thousandths)
1 mile=5280 feet
MAT/117

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