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Differentials word problem

  1. Oct 8, 2009 #1
    1. The problem statement, all variables and given/known data

    Use differentials to estimate the amount of paint needed to apply a coat of paint 0.05 cm thick to a hemispherical dome with diameter 54 m.

    2. Relevant equations

    dy=dy/dx *dx

    Surface area of a hemishpere=2pi*r^2

    3. The attempt at a solution

    dy=4pi*r dx
    dy=4pi*27 *.05
  2. jcsd
  3. Oct 8, 2009 #2


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    Science Advisor
    Homework Helper

    You want to express all of your numbers in the same units. 0.05 cm is not the same as 0.05 m.
  4. Oct 8, 2009 #3
    genius...thank you!
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