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    Algebra Basics which involves Physics.

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    I really need help on this one. Find the mass and radius of three of the nine planets in our solar system. I chose pluto, venus, mars. My masses must be expressed in kilograms and the radii expressed in meters.
    I am trying to calculate the gravitational acceleration on each of the three planets I selected. The masses must be measured in kilograms and the radii in meters, so the units of gravitational acceleration would turn out to be meters per squared seconds. I must now use the gravitational accelerations that I calculated in Step 2 to find the period of a 2 meter long simple pendulum on each of the nine planets. I notice the length of a simple pendulum is normally expressed in meters, so it is sufficient to replace L with the number 2 in the period expression. Are should I.
    I posted this problem under Algebra and got a short answer in which I am still not clear. I was told I should have post my question under physics.

    This was the answer I received, but I still dont understand totally. Can this be broken down some more. Please....

    By Newtons Gravitation Law,
    g = GM/r2, where
    g = acceleration due to gravity (m/s2)
    G = Newton's Gravitation Constant = 6.673*10-11 m3 kg-1 s-2
    M = Mass of planet
    r = Radius of planet

    We get the following data and calculate g for each planet:

    Planet Mass Diameter Radius g = GM/r2
    Pluto 1.25*1022 kg 2390 km 1195*103 m 0.584 m/s2
    Venus 4.8685*1024 kg 12,103.7 km 6051.85*103 m 8.870 m/s2
    Mars 6.4185*1023 kg 6,804.9 km 3402.45*103 m 3.700 m/s2

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