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# cicular motion watch

1. the mir space station has a mass of 20900 kg and orbits the earth at 350 km where the gravitational acceleration is 8.8ms-2

calculate the centripetal force (done this its 184 kN)

calculate the speed at which it orbited??

thanks
2. a = v²/r

(remembering r = radius of earth + orbital height)
3. (Original post by elpaw)
a = v²/r

(remembering r = radius of earth + orbital height)

4. (Original post by sarah12345)
the mir space station has a mass of 20900 kg and orbits the earth at 350 km where the gravitational acceleration is 8.8ms-2

1.) calculate the centripetal force (done this its 184 kN)

2.) calculate the speed at which it orbited??

thanks
1.) Centripetal Force = mg = 20900 * 8.8 = 183, 920 N
2.) Speed (Orbit) = Sqrt (ar) = Sqrt {8.8 * [350 * 10^3 + 6400 * 10^3]} = 7707 ms^-1

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Updated: February 13, 2005
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