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    How Much Helium Is Needed to Lift a 4000 kg Load with a 600 kg Weather Balloon?

    Helium Balloon Question...Help! A 600 kg weather balloon is designed to lift a 4000 kg package. What volume should the balloon have after being inflated with helium at standard temperature and pressure in order that the total load can be lifted? density of helium .179 and air is 1.29. I have...
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