Va is the orbital speed of a satellite at a distance x from the centre of the Earth. If the satellite is at a distance 2x from the centre of the Earth and with the speed of Vb, which of the following statements is correct?

Question

chris215 · Answer

va=vb^2

anonymous · Answer

well the answer is Vb = Va^2
Va^2 = Gm/r
and Vb^2 = Gm/2r
which leads you to get 2(Vb^2) = Va^2
which gets you Vb = Va^2

chris215 · Answer

these are the only answer choices I have

anonymous · Answer

this is physics right?

chris215 · Answer

yeah i already posted it in physics and no one has helped

loser66 · Answer

Is it not that @Marcorie  gave you the answer which is b) ??

loser66 · Answer

He was downhill without apply the break, so that he had one more extra simplification and that confused you!! stop at $2V_b^2=V_a^2$ , which is option b

loser66 · Answer

*applying