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March 3, 2015

March 3, 2015

Posted by **stephen** on Saturday, January 1, 2011 at 7:10pm.

- math -
**Damon**, Saturday, January 1, 2011 at 7:28pmrate of change of volume = surface area * rate of change of depth

(look at thin slice of area pi r^2 and depth delta h)

what is r?

4/10 = r/6 similar triangles

r = 12/5

surface area = pi(144/25)

so

-7 cm^3/s = pi(144/25) cm^2 * dh/dt

so

dh/dt = -(25*7)/(144 pi) cm/s

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