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Momentum principle to calculate speed

  • Thread starter shehan1
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  • #1
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1. A satellite of mass 8000 kg orbits the Earth in a circular orbit of radius of 9.5 106 m (this is above the Earth's atmosphere).The mass of the Earth is 6.0 1024 kg.

What is the speed of the satellite?



2. Pf = pi+Fnet + delta t


3. the only thing i knew to try was 2pi(r)/dt
 

Answers and Replies

  • #2
gneill
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Think circular motion, centripetal force, Gravity.
 
  • #3
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Do i use F = (mv^2)/r ?
 
  • #4
gneill
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Well, that's one formula that you'll need. What are you going to use for the value of F?
 
  • #5
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GMm/ R^2 ?
 
  • #6
gneill
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20,797
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That looks promising. Why not try it?
 
  • #7
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Thanks that helped a lot!
 

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