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On October 21, 2001, Ian Ashpole of the United Kingdom achieved a record altitude of 3.35...

On October 21, 2001, Ian Ashpole of the United Kingdom achieved a record altitude of 3.35 km (11 000 ft) powered by 600 toy balloons filled with helium. Each filled balloon had a radius of about 0.52 m and an estimated mass of 0.24 kg.

(a) Estimate the total buoyant force on the 600 balloons.
N

(b) Estimate the net upward force on all 600 balloons.
N


(c) Ashpole parachuted to Earth after the balloons began to burst at the high altitude and the buoyant force decreased. Why did the balloons burst?

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