Results 1 to 3 of 3

Math Help - finding the density in g/cm^3

  1. #1
    Newbie
    Joined
    Mar 2011
    Posts
    1

    Unhappy finding the density in g/cm^3

    A planet is estimated to have a mass of 1.8344 x 1024 kg. Assuming the planet is a sphere of average radius 5399 km, calculate the average density of the planet in units of g/cm3.

    density=mass/volume
    so i convert the 1.8344 x 10^24 kg to g= c

    Volume of sphere=4/3 x pie x r^3
    =4/3 x pie x 5399^3
    = 6.59217 x 10^11 km^3

    km^3 --> 6.59217 x 10^26 cm^3

    then d= 1.8344 x 10^24 g/6.59217 x 10^26 cm^3
    =0.002783

    is there anything wrong with my answer?
    this is a mutiple choice and the closest answer is

    2.78 g/cm3but it just doesnt seem right.

    Help is very appreciated, thanks!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    You used the grams as your mass instead of kg. Multiply your answer by 1000 to get the correct answer
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    10,054
    Thanks
    368
    Awards
    1
    Quote Originally Posted by Mathematicss View Post
    Volume of sphere=4/3 x pie x r^3
    It's spelled "pi" not "pie." (sobs)

    -Dan
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Finding Marrginal Density Fcn From Join Density Fcn
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: October 26th 2010, 08:25 PM
  2. finding mass from density
    Posted in the Algebra Forum
    Replies: 5
    Last Post: December 3rd 2009, 05:19 AM
  3. help with finding density fuction
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: March 14th 2009, 02:46 PM
  4. Finding Feet Given Density
    Posted in the Math Topics Forum
    Replies: 10
    Last Post: August 24th 2008, 07:23 PM
  5. Finding the density function
    Posted in the Statistics Forum
    Replies: 0
    Last Post: October 6th 2007, 09:18 PM

Search Tags


/mathhelpforum @mathhelpforum