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    punker_rocker's Avatar
    punker_rocker Posts: 3, Reputation: 1
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    #1

    Apr 1, 2010, 05:30 PM
    Physics problem involving Newton's 2nd Law and the Gravitational Force
    You observe an arti cial satellite orbiting the earth. You estimates it is at
    an altitude h = [03] km above the earth's surface and has a mass
    m = 3500 kg. You wish to calculate when the satellite will be back in the same position. From the second law of motion and the gravitational force law, calculate the following:
    (a) What is the satellite's velocity? (m/s)
    (b) What is the period of the satellite's motion?

    The only force acting on the satellite is the gravitational force (Fg) right? So by combining the two laws, we would have that ma=Fg. I solved for the Fg, but I'm not sure where to go from there.
    punker_rocker's Avatar
    punker_rocker Posts: 3, Reputation: 1
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    #2

    Apr 1, 2010, 06:25 PM

    Sorry, that's supposed to be 736 km above the earth's surface.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Apr 2, 2010, 10:02 AM

    You have to consider the centripetal force which prevents the satellite from crashing on the Earth.



    From that, you have Fc = Fg, then:



    Solve for v.

    Then, use

    Find omega, which is 2pi/T.

    Find T, the period of the satellite.

    I hope it helped! :)
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