Physics Help Forum Rocket above Earth Question

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 Jan 20th 2009, 07:21 PM #1 Junior Member   Join Date: Oct 2008 Posts: 11 Rocket above Earth Question How high does a rocket have to go above Earth's surface until its weight is one eighth what it would be on Earth? help!!
Jan 21st 2009, 07:15 PM   #2
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 Originally Posted by jello17 How high does a rocket have to go above Earth's surface until its weight is one eighth what it would be on Earth? help!!
$\displaystyle W = \frac{GM_e m}{R_e^2}$

$\displaystyle \frac{W}{8} = \frac{GM_e m}{8R_e^2} = \frac{GM_e m}{(\sqrt{8} \cdot R_e)^2}$

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