Posted by **Nicole ** on Thursday, March 14, 2013 at 11:51pm.

Calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5100 km above the earth's surface.

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**John**, Thursday, March 14, 2013 at 11:59pm
Isn't "g" constantly -9.8 m/s/s, regardless of height?

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**Nicole **, Friday, March 15, 2013 at 12:00am
that's what i thought but i put 9.8 and -9.8 in and the answer was wrong. so somehow it's different

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**John**, Friday, March 15, 2013 at 12:03am
The effective value of g is inversely proportional to the SQUARE of the distance from the center of the earth.

The radius of the Earth is 6378 km. At 5100 km altitude, you are 11,478 km from the center.

g will lowered by a factor (6378/11478)^2

Credit to "drwl"

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