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April 20, 2014

April 20, 2014

Posted by **Daniel** on Wednesday, November 10, 2010 at 11:54pm.

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

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

- Physics -
**drwls**, Thursday, November 11, 2010 at 12:05amLet V be the balloon volume.

Let rho1 = air density and

rho2 = helium density. Look them up or use the gas law to compute them. Helium weighs 4/29 as much as air at the same T and p.

For the balloon and its weight to be lifted,

rho1*V = 4000 + 600 + rho2*V

V = 4600/(rho1-rho2)

- Physics -
**Daniel**, Thursday, November 11, 2010 at 12:22amok what is rho? I know the answer to this problem is 9.96 m because our teacher gave us the answer

- Physics -
**Daniel**, Thursday, November 11, 2010 at 12:22amOk nvm i will do the math. Sorry didnt read what they stood for. Thx for the help =)

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