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: Just started physics and need help!

  1. Jan 28, 2005 #1
    I cant figure out how to get the answer with the given info, pleas help.

    In the fall of 2002, a group of scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about . The critical mass of a fissionable material is the minimum amount that must be brought together to start a chain reaction. Neptunium-237 has a density of .

    What would be the radius of a sphere of neptunium-237 that has a critical mass?
    Express your answer in centimeters to three significant figures.
  2. jcsd
  3. Jan 28, 2005 #2
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook