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Math Help - Physics Gravitational Forces

  1. #1
    Senior Member sakonpure6's Avatar
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    Physics Gravitational Forces

    A spacecraft is orbiting around venus. The acceleration due to gravity at its orbit is 3m/s^2 . Estimate the height of the orbit above Venus' surface. Take the acceleration due to gravity at Venus's surface to be 8.87 m/s^2 and the radius of Venus to be 6050km.
    How do I approach this? I tried using g = \frac{G M}{(r+h)^2} but since we are not given a mass and we have 2 acceleration values, how do you "assemble" this puzzle?

    Thank you for your time
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    Re: Physics Gravitational Forces

    at h = 0

    r = rv , g = 8.87. use this to find a M value

    then at h = h(orbit)
    r = rv
    g = 3
    M is what you worked out and you can find the value of h
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    Forum Admin topsquark's Avatar
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    Re: Physics Gravitational Forces

    Quote Originally Posted by infkelsier View Post
    at h = 0

    r = rv , g = 8.87. use this to find a M value

    then at h = h(orbit)
    r = rv
    g = 3
    M is what you worked out and you can find the value of h
    I presume that "rv" is the "radius of Venus?"

    -Dan
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    Re: Physics Gravitational Forces

    Quote Originally Posted by topsquark View Post
    I presume that "rv" is the "radius of Venus?"

    -Dan
    yeh
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