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Homework Help: Mass of a planet/sun

  1. Mar 16, 2010 #1
    1. The distance between the Sun and Earth is 1.5x10^11m and the Earth's orbital speed is 30km/s. Use this information and the value of G to estimate the mass of the Sun

    could somebody check this for me please. thank you

    2. G=6.67x10^-11Nm^2kg^-2


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  3. Mar 16, 2010 #2


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    Homework Helper

    Your working is correct, you numerical result is wrong. Your final answer should be in the order of 1030
  4. Mar 17, 2010 #3
    it is too.
    It should be 2.0x10^30(1s.f.)?
  5. Mar 17, 2010 #4

    D H

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    Staff Emeritus
    Science Advisor

    That is the answer you should get. Now look at your expression, and see if you really did calculate what you wrote down. (Hint: you didn't.)
  6. Mar 17, 2010 #5
    I blame the calculator. Who's with me?

    thanks everyone for this.:smile:
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