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Thread: Please check my math

  1. #1 Please check my math 
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    May 2017
    Please tell me if I have the math right, but I looked up mass of a neutron star and its 1.4 times the sun in a 15 kilometre neutron star. So the volume of a 15 kilometre radius of a sphere and the volume is 4/3π153 The mass of a neutron star is 1.4 times the mass of the sun. So that equals 2.7846 X 1030, mass of the sun is 1.989 X 1030. So Divide the mass by the volume and I got 1.9697011 X 1026. I don't know if I should measure in g/cm3or another unit. Please help.

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  3. #2  
    Genius Duck Dywyddyr's Avatar
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    Jan 2013
    Scunthorpe, UK
    It can't be g/cm3 since the mass is in kg and the volume is in km.
    Ergo the density is kg/ km3.

    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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  4. #3  
    Moderator Moderator Janus's Avatar
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    Jun 2007
    If you want g/cm3, you need to convert the radius from km to cm, and the mass from kg to g before you do the math.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone

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