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In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 and a radius of 8.50 .

What is the speed of a satellite orbiting 4.70km above the surface?

What is the escape speed from the asteroid?

  • Physics -

    You need to provide units for your quantities. I will have to assume your 8.50 is km and your 10^16 is kg.

    4.70 km above the surface is R = 13.2 km (or 1.32*10^4 m) from the center

    The orbital speed satisfies
    G M/R^2 = V^2/R
    where M is the asteroid mass and you know what G is. Solve for V.
    V = sqrt(GM/R)

    For the escape velocity Ve from the asteroid FROM THE SURFACE, where R' = 8.50 *10^3 m,

    Ve^2/2 = GM/R'

    Ve = sqrt(2 G M/R')

    Note that a different radius, R', must be used.

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