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Q. A scuba diver dives at an angle of 60° with the horizontal and swims 30 m to the top of a reef. How far under water in meters is the top of the reef?

Q. A spherical balloon has a radius of 12.5 m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? Neglect the bouyant force on the cargo volume itself.

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