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# A2 circular motion question.

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1. A2 circular motion question.
Hi,I missed the lesson o n circular motion, and am struggling to find which eqaution to use for the following questions;

A space station orbits the earth once every 91 minutes. Calculate the angular speed of the space station.

The space station orbit is 210km above the surface of the earth, which has a radius of 6370km. Find the acceleration of the space station.

Thanks
2. Re: A2 circular motion question.
Angular speed is just distance/time so you need to work out how far the total path around the earth is.

The acceleration is given by the equation a=(v^2)/r
3. Re: A2 circular motion question.
(Original post by nicatre)
Angular speed is just distance/time so you need to work out how far the total path around the earth is.

The acceleration is given by the equation a=(v^2)/r
4. Re: A2 circular motion question.
(Original post by theandyguthrie)
You use this to find the angular speed/velocity

(Original post by nicatre)
Angular speed is just distance/time so you need to work out how far the total path around the earth is.

The acceleration is given by the equation a=(v^2)/r
Technically you could find the velocity this way but its much easier to use w=2pi/T You can't do it your way for this question either, because for the first part you don't know the radius so cant work out circumference
Then you use a=v^2/r to find the acceleration like you said.
Last edited by Stevo F; 24-06-2012 at 10:04.

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Last updated: June 24, 2012
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