In the following problem, I got that the velocity is 5609m/s but the answer key says that the velocity of the rocket is 3950m/s. I know both answers can be calculated but I dont understand why the radial distance would be the distance from the rocket to the earths surface. I personally think that the velocity of the rocket should be calculated in respect to the center of the mass that is is orbiting around. Could some please tell me if I am right, it would be greatly appreciated. Oh yeah, and I got the correct force which is F=12268.1N. Once again, thanks for any help provided in advance(adsbygoogle = window.adsbygoogle || []).push({});

Here's part of the problem:

1. A 5000 kg rocket orbits the earth at an altitude above the earthâ€™s surface equal to the radius of the earth[R_earth=6.4*10^6m].

a. Calculate the force exerted on the rocket by the earth.

b. Calculate:

i. the velocity of the rocket

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Law of Gravitation Please Help

**Physics Forums | Science Articles, Homework Help, Discussion**