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On October 21, 2001, Ian Ashpole of the United Kingdom achieved arecord altitude

ID: 1745541 • Letter: O

Question

On October 21, 2001, Ian Ashpole of the United Kingdom achieved arecord altitude of 3.35 km (11 000 ft) powered by 600 toy balloonsfilled with helium. Each filled balloon had a radius ofabout 0.55 m and anestimated mass of0.26 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 burstat the high altitude and the system lost buoyancy. Why did theballoons burst?
Atmospheric pressure at this ---Select---lowhigh altitude is much ---Select---lowerhigher than at the Earth's surface. (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 burstat the high altitude and the system lost buoyancy. Why did theballoons burst?
Atmospheric pressure at this ---Select---lowhigh altitude is much ---Select---lowerhigher than at the Earth's surface.

Explanation / Answer

a) The buoyant force acting on the balloon            FB = 600(air Vg) b) The force acting on the ballon              F = FB   (When a body floats , the magnitudeof the buoyant force on the body is equal to gravitationalforce. c) Because the atmospheric pressure decreases as altitudeincreases.

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