Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Related Rates

  1. Feb 11, 2008 #1
    A cylinder is placed in oven where both the height and base radius expand at 0.1 mm/min. When the height is 250 mm and the radius of the base 30 mm, the volume is expanding at ......mm3 /min. (Answer to nearest whole number)

    r=30, h=250, dr/dh=0.1, dh/dt=0.1

    dV/dt = (pi)r^2(dh/dt) + 2rh(dr/dt)
    =(pi(30)^2(0.1) + 2(30)(250)(0.1)

    Can anybody please show me where I'm going wrong with this one?
  2. jcsd
  3. Feb 11, 2008 #2
    [tex]V=\pi r^2h[/tex]

    You're missing a pi term!

  4. Feb 12, 2008 #3
    Thanks roco!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Related Rates
  1. Related Rates (Replies: 2)

  2. The concept of a rate (Replies: 4)