An empty rubber balloon has a mass of 0.0135 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.300 m. If the filled balloon is fastened to a vertical line, what is the tension in the line?(adsbygoogle = window.adsbygoogle || []).push({});

I don't even know what equation to use...! AHH

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# Not sure how to start this problem hint please!

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