1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Steel Cylinder mass

  1. Nov 14, 2008 #1

    I have a problem I want to find the mass of a hollow cylinder which is made of steel, the sylinder diameter is 2.5m, the length is 4m, then I have done my calculations as follow:

    Volume of the cylinder = Лd²/4 x h = 19.635 cubic meters

    Mass of cylinder = volume x denisity
    = 19.635 x 7800 = 153153 kg

    This a very big mass I think it's wrong but I don't know why if you know can you help me please?
  2. jcsd
  3. Nov 14, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You have calculated the mass of a solid steel cylinder. You need to know the wall thickness of the hollow cylinder, so you can exclude the hollow part in your calculation.
  4. Nov 14, 2008 #3
    The wall thickness is 8 mm but Iam not sure how to do it? how to exclude it from the calculation?
  5. Nov 14, 2008 #4


    User Avatar
    Science Advisor

    When you calculate the volume, subtract out the inner diameter.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook