Wednesday
August 27, 2014

Homework Help: Math

Posted by ASD on Friday, September 17, 2010 at 10:02am.

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: w=Cr^-2 , where C is a constant, and r is the distance that the object is from the center of Earth.
a.Solve the equation w=Cr^-2 for r. The answer I came up with is r^-2=w/C: is this correct?
And would you please help me with b?
b.Suppose that an object is 100 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.)
Thank you!

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