Posted by **Cole** on Monday, November 1, 2010 at 5:49pm.

How much would a 80kg astronaut weigh on Earth? How much would they weigh 500 km above the surface of the Earth?

Thank you!

- Physics 11 -
**bobpursley**, Monday, November 1, 2010 at 6:00pm
on Earth, weight= mg

at the higher altitude,

weight= mg* (re/(re+800))^2 where re is the radius of earth in km.

- Physics 11 -
**Damon**, Monday, November 1, 2010 at 6:01pm
80 * 9.81 = weight on surface where R = Rearth

weight * R^2 = constant = G m M

weight at Rearth +500,000 meters

weight*(Rearth+5*10^5)^2 = 80*9.81 * Rearth^2

so

weight up there = 80*9.81 (Rearth)^2/(Reart+5*10^5)^2

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