1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Mass of star problem

  1. Mar 2, 2014 #1
    hi, this is my first post here as i have driven insane by a math problem for my final year astronomy class, ive been at it for 3 hours and i can't make sense of it

    oq8ton.jpg
    is the question even correct as i have made the assumption that the volume of a sphere times the density would give me 4 were there is a 2 and the density p instead of the density constant pc?
     
  2. jcsd
  3. Mar 2, 2014 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The density of the star is not constant throughout its volume. The expression for the density in section (1a) should be written

    ρ(r) = ρ[itex]_{c}[/itex](1 - (r/R)[itex]^{3}[/itex])

    for clarity. In order to derive M(r) and the total mass, you must do some integrations.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Loading...