## anonymous 4 years ago What is the orbital radius and the speed of o sycronous satellite which orbits the earth once evry 24h? Take G=6.67x10^11Nm^2/kg^2, Mass of the earth is 5.98x10^24kg

1. anonymous

$T ^{2} = (4\pi ^{2}/GM) \times R ^{3}$$(24)^{2} = (4\times3,14^{2}\div(6,67\times10^{-11}\times5,98\times10^{24})) \times R ^{3}$$R \approx 17,9\times10^{4}m$$mV ^{2}/R = GMm/R ^{2}$$V = \sqrt{6,67\times10^{-11}\times5,98\times10^{24}/ 17,9\times10^{4}}$$V \approx 6,95\times10^{4}m/s$ ;)

2. anonymous

T should be 86400

3. anonymous

yeah T is "86400", i'm sorry for that, just plug in 86400 where i put "24"