Posted by **Teri** on Friday, May 21, 2010 at 4:23pm.

Using the formula: w=Cr^-2 where C is a constant, and r is the distance that the object is from the center of Earth. W is the weight.

1- Suppose an object is 100lbs 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.

- Algebra -
**Reiny**, Friday, May 21, 2010 at 4:53pm
sub in the given data ...

100 = C(3963)^-2

C = 100(3963)^2 ... huge number

- Algebra -
**Teri**, Friday, May 21, 2010 at 5:13pm
Would you not divide the big number by 100 to get C alone?

- Algebra -
**Reiny**, Friday, May 21, 2010 at 6:31pm
100 = C(3963)^-2

100 = C/3963^2 , so now we have to mutiply both sides by 3963^2 to get C alone, like I had

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