Determine the value of h

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A helium-filled balloon, whose envelope has a mass of 0.26 kg, is tied to a 3.9-m long, 0.052-kg string. The balloon is spherical with a radius of 0.40 m. When released, it lifts a length h of the string and then remains in equilibrium, as in the figure below. Determine the value of h. Hint: Only that part of the string above the floor contributes to the load being supported by the balloon. (The density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3.) m
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