Posted by **Kyle** on Thursday, October 28, 2010 at 10:39pm.

Calculate the force of gravity on a spacecraft 19200 km (3 earth radii) above the Earth's surface if its mass is 1600 kg.

I've done all the work but I can't seem to get the right answer, please show work and answer.

- Physics -
**bobpursley**, Thursday, October 28, 2010 at 10:43pm
No, I am not going to show all work. Goodness.

the force of gravity at Earth is mg

at 3 earth radii above, that is a total of 4 earth radii from then center, so weight at that altitude is 1/16 of mg.

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