On October 21, 2001, Ian Ashpole of the United Kingdom achieved a record altitud
ID: 1972100 • Letter: O
Question
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 0.33 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 system lost buoyancy. Why did the balloons burst?
Atmospheric pressure at this [A. low] or [B.High] ___________altitude is much [A. lower] or [B. higher]___________ than at the Earth's surface.
Explanation / Answer
a) total force =600*(4/3)0.533*0.79625*9.8
= 2919.73 N
b) Net upward force = 2919.73-mg
= 2919.73-1940.4
= 979.33 N
c) Because pressure inside the balloon was higher than the atmospheric pressure which is quite low at high altitudes
d) B, A
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