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August 22, 2014

August 22, 2014

Posted by **john** on Monday, October 24, 2011 at 7:33pm.

- calculus -
**Steve**, Monday, October 24, 2011 at 11:47pmI once had a splenical balloon. It was almost spherical.

With that in mind,

v = 4/3 pi r^3

dv/dt = 4 pi r^2 dr/dt

so, plug and chug

10 = 2 pi dr/dt

dr/dt = 10/2pi = 1.5915 in/s

Note: surface area**is**4pi r^2

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