Posted by **Jeremy** on Tuesday, September 2, 2014 at 1:32pm.

What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r = 0.84 ± 0.04m ?

- physics -
**Damon**, Tuesday, September 2, 2014 at 1:38pm
v = (4/3) pi r^3

dv/dr = 4 pi r^2

(which is the surface area of course :)

dv = 4 pi r^2 dr

dv/v = 4 pi r^2 dr/(4/3)pir^3

dv/v = 3 dr/r

here dr = .04

and r = .84

so 100 * 3 dr/r = 12/.84 = 14.3 %

- physics -
**lana**, Sunday, April 3, 2016 at 12:38am
how do u get dv/v = 3 dr/r ?

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