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The mass of a hot-air balloon and its cargo (not including the air inside) is 220...

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Physics

The mass of a hot-air balloon and its cargo (not including theair inside) is 220 kg. The air outside is at 10.0°C and 101 kPa.The volume of the balloon is 490 m3. To what temperaturemust the air in the balloon be warmed before the balloon will liftoff? (Air density at 10.0°C is 1.244 kg/m3.)
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