(adsbygoogle = window.adsbygoogle || []).push({}); Helium Balloon Question!!!

Hey I have a buoyancy question here, anyone know how to solve it? A 15 gram rubber balloon is filled with 18 L of Helium (density 0.179kg/m^3) and tied with a string to a child's wrist. Find the tension in the cord. The answer is 0.050N but what is the solution?

Im not sure if yuo need it but the denisty of air is 1.29kg/m^3. Thanks.

2. Relevant equations

Equations i used include F buoyancy = F tension + m helium * gravity + m balloon * gravity

and F buoyancy = density * gravity * volume displaced

3. The attempt at a solution

I tried to solve but got completely different answers, what is the volume displaced? is that the right thing to use?

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# Homework Help: Helium Balloon Question

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