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 0.53 m and an estimated mass of 0.26 kg. (a) Estimate the total buoyant force on the 600 balloons. (Enter your answer to at least two decimal places.)  _____________ kN (b) Estimate the net upward force on all 600 balloons. ______________ kN

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