For a star of constant density, calculate the fraction of the total mass inside a core of radius R/4, if the radius of the star is R.

I have no idea.

Thanks for any help.

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- Apr 27th 2009, 05:08 AMemmaastronomyMaths/astronomy help!
For a star of constant density, calculate the fraction of the total mass inside a core of radius R/4, if the radius of the star is R.

I have no idea.

Thanks for any help. - Apr 27th 2009, 05:55 AMmr fantastic
- Apr 27th 2009, 05:56 AMHallsofIvy
Sorry, but I have no idea what "calculate the fraction of the radius R/4" means. Since you mention density, do you mean calculate the

**mass**out to radius R/4 or the fraction of the total mass that is? Do you know the formula for volume of a cube? Mass is just density times volume. - Apr 27th 2009, 10:04 AMemmaastronomy
- Apr 27th 2009, 02:20 PMmr fantastic
- Apr 30th 2009, 01:58 AMemmaastronomy
- Apr 30th 2009, 03:01 AMmr fantastic