Posted by Sasha on Monday, October 26, 2009 at 10:03pm.
calculate the force of Earth's gravity on a spacecraft 12,800 km (2 Earth radii) above Earth's surface if its mass is 1350 kg.
i know the universal gravitation formula is Fg = G [(m1 m2)/ r^2] but im not getting anywhere near the multiply choice answers of: 14,470, 4410 N, 2205 N, or 1470 N

physics  MathMate, Monday, October 26, 2009 at 10:16pm
r is the distance to the centre of the body. What did you use for r?

physics  Sasha, Monday, October 26, 2009 at 10:26pm
i tried squaring earth's radii and i tried multiplying it by 2

physics  MathMate, Monday, October 26, 2009 at 10:46pm
Ouch!
"(2 Earth radii) above Earth's surface" means 3 earth radii from the centre, right?

physics  ajcjk, Monday, November 9, 2015 at 2:27pm
I have no clue
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