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A hot air balloon uses a gas flame to heat the air it contains to a temperature required to
enable it to hover at a small distance above ground level. The mass of the balloon, ropes,
basket and riders is 240 kg and the volume of the balloon is 1100 m³. The temperature of
the surrounding air is 15°C and its density is 1.23 kg m-³.
To what temperature does the air in the balloon need to be heated?
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