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Satellite - resistance (retarding force)

  1. Mar 20, 2017 #1
    1. The problem statement, all variables and given/known data
    What is the average resistance force F acting on the satellite during its flight, m = 3000kg, h=300km.

    2. Relevant equations


    3. The attempt at a solution
    If it is llow orbit, so it inhibits the resistance of the atmosphere. In 300 km is no air, so no resistance ....?
     
  2. jcsd
  3. Mar 20, 2017 #2

    BvU

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    What equation are you using to calculate air pressure at 300 km ?
     
  4. Mar 20, 2017 #3
    upload_2017-3-20_13-0-21.png ?
     
  5. Mar 20, 2017 #4
    p0 = 101 325 Pa
    h= 300 000m
    g=9,81 m/s2
    ρ 0 = 1,225 kg/m3
     
  6. Mar 20, 2017 #5
    p 300 000 = 101 325*e-35,58 Pa
     
  7. Mar 20, 2017 #6

    BvU

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  8. Mar 20, 2017 #7

    BvU

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    Agree it isn't much. What is the question (the full problem statement) ?
     
  9. Mar 20, 2017 #8
    Yes I agree. Therefore, I think that is a resistive force is zero.
     
  10. Mar 20, 2017 #9

    BvU

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    According to your terse problem statement they ask for the average reisistance during its flight.
    If its flight is circling the earth for 30 years it might be relevant to come up with a non-zero number.
    But if its flight is a launch from sea level all the way up to 300 km I suppose you can ignore the pressure up there.

    That's why I asked for the full problem statement
     
  11. Mar 20, 2017 #10
    I understand. I have to ask my teacher. Yet I thank you for the effort and help.
     
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