Question

Calculate the force of gravity on a spacecraft 12,800 𝑘𝑚 above the earth’s surface if its mass is 850 𝑘𝑔. 

Answer 1

$F=GMm/r^2=$

$=6.67\cdot10^{-11}\cdot5.97\cdot10^{24}\cdot850/(6400000+12800000)^2=$

$=921\ (N)$