On October 21, 2001, Ian Ashpole of theUnited Kingdom achieved a record altitude

Question

On October 21, 2001, Ian Ashpole of theUnited Kingdom achieved a record altitude of 3.35 km (11 000 ft)powered by 600 toy balloons filled with helium. Each filled balloonhad a radius of about 0.5 m and anestimated mass of 0.30kg.
(a) Estimate the total buoyant force on the 600balloons.
(b) Estimate the net upward force on all 600 balloons.
(c) Ashpole parachuted to Earth after the balloons began to burstat the high altitude and the system lost buoyancy. Why did theballoons burst? Atmospheric pressure at this (low/high) 3 altitude is much4(higher/lower) than at the Earth's surface.

Explanation / Answer

     Given :     r = 0.5 m    m = 0.3 kg n = 600 air = 1.29 kg/m3    a ) The total buoyant force on 600 ballonsis        B = n  air V g            =n   air ( 4/3 r3 )g           =------ N b ) The net force on the balloons         Fnet = B - nmg                  = ---- N    Solve the above     I hope it helps you    a ) The total buoyant force on 600 ballonsis        B = n  air V g            =n   air ( 4/3 r3 )g           =------ N b ) The net force on the balloons         Fnet = B - nmg                  = ---- N    Solve the above     I hope it helps you

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