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The mass of a hot-air balloon and its cargo (excluding
the air inside) is 150 kg. The temperature of the
surrounding air is 10.0°C and the pressure is 101 kPa.
The volume of the balloon is 300 m3. Find the
temperature the air in the balloon must be heated to lift
the balloon up. (The Density of air at 10.0°C is 1.25
kg/m.)

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