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Homework Help: Satellite Gravitational Forces

  1. Dec 18, 2011 #1
    1. The problem statement, all variables and given/known data

    a 500 kg satellite experiences a gravitational force of 3000 N, while moving in a circular orbit around the earth.

    a) Find the radius of the circular orbit
    b)Find the Speed of the Satellite
    c) Find the period of the orbit

    2. Relevant equations


    3. The attempt at a solution

    Fnet = GM1M2/r2
    r=√(6.67x10-11)(5.98x1024)(500)/3000 N)

    b)3000 N= (500)V2/(8.15x106)
    V=6994 m/s (25, 178 km/hr)

    c) V= 2∏r/T
    T=7321.7 S (2.03 h)

    Does everything look okay, Im really usure of my understanding of gravitational forces.. Thanks!

  2. jcsd
  3. Dec 18, 2011 #2
    looks good to me
    I didn't check the numbers but your working seems fine

    is there anything specific that you don't understand about the gravitational force?
  4. Dec 18, 2011 #3
    I cant think of anythin specifically that confuses me i just taught it to myself today and i want to make sure its all logical and im not breaking rules etc. when doing calculations.. Thank you for your help and confidence boost!
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