Posted by **Daniel** on Thursday, November 11, 2010 at 9:48am.

A 600-kg weather ballon is designed to lift a 4000-kg package. What volume should the ballon have after being inflated with helium at standard temperature and pressure so the total load can be lifted up?

The problem asks for volume. Take it a step further...

assume the ballon is spherical, and find it's radius.

- Physics -
**Daniel**, Thursday, November 11, 2010 at 9:48am
Ok so I know how to find the volume. I just need to know how to get the radius.

- Physics -
**drwls**, Thursday, November 11, 2010 at 10:29am
Since V = (4/3)*pi*R^3 (for a sphere),

R = cube root of [3V/(4*pi)]

- Physics -
**Daniel**, Thursday, November 11, 2010 at 12:05pm
Thank you! Took me a little whilez to figure it out but I got it.

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