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Calculating satellites´ period of revolution

  • #1

Homework Statement


Earths´ satellite orbits 4200km above Earths surface. Count satellites´ trajectory circle-shaped and calculate satellites´period of revolution.

The Attempt at a Solution


I added the Earths´ radius to the 4200 km, which represents the orbiting attitude and then my mind crashed...
please some helpo:)
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,090
4
Welcome to PF.

What is the acceleration of gravity at that height? (Hint: it's not 9.8)

What other acceleration is there from circular motion?
 
  • #3
Welcome to PF.

What is the acceleration of gravity at that height? (Hint: it's not 9.8)

What other acceleration is there from circular motion?
Of course the centripetal-acceleration but I thought that I should know the mass of the satellite to calculate the acceleration of gravity...

btw.. thanks for the welcome
 
  • #4
LowlyPion
Homework Helper
3,090
4
Of course the centripetal-acceleration but I thought that I should know the mass of the satellite to calculate the acceleration of gravity...

btw.. thanks for the welcome
Since the 2 accelerations will need to offset to stay in orbit, you won't need the mass.
 
  • #5
Since the 2 accelerations will need to offset to stay in orbit, you won't need the mass.
yeah, that settles it down, I think I can see the big picture now,
Thank You!
 

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