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: Need Help!

  1. Aug 28, 2005 #1
    I need help with this question: Sphere 1 has surface area A1 and volume V1, and Sphere 2 has surface area A2 and volume V2. If the radius of Sphere 2 is six times the radius of Sphere 1, what is the ration A2/A1 of the areas?

    Part two: What is the ratio V2/V1 of the volumes?

    :confused:
     
  2. jcsd
  3. Aug 28, 2005 #2

    TD

    User Avatar
    Homework Helper

    For a sphere with radius R, area (A) and volume (V) are:

    [tex]\begin{array}{l}
    A = 4\pi R^2 \\
    V = \frac{4}{3}\pi R^3 \\
    \end{array}[/tex]

    With your knowledge of the ratio's of the radii, that should help :smile:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook