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1. (30 pts) A helium balloon floats still at an altitude of 1.39 km. The balloon has a spherical shape with a diameter of 11.0 m, and its skin and structure has a mass of 311.5 kg. a.) What is the absolute pressure at this altitude? Assume a constant density for air. b.) Calculate the buoyant force the air exerts on the balloon. c.) How much cargo can the balloon carry, in kg?
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C.AS, B- M- 3362.1627 -S3. 28

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