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A hot-air balloon is initially floating (stationary) a few metres above the ground. The radius of the...

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Physics

Ahot-air balloon is initially floating (stationary) a few metresabove the ground. The radius of the spherical balloon is 6.25 m,and the density of surrounding air is 1.29 kg m-3. \"Ballast\" isweight of negligible volume that can be dropped to make the balloonrise. How much weight would you have to drop overboard to make theballoon rise 105 m in 15.0 s? You may assume that the density ofsurrounding air remains constant.

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