CIEG 305 IN CLASS EXERCISE ON BUOYANCY

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CIEG 305 IN CLASS EXERCISE ON BUOYANCY
Spy work has been slow. Hallmark called.
MISSION Determine the minimum weight of the
helium balloon card to keep it from floating
away. You will be paid the grand sum of 3.38
for your consulting time.
Assumptions Balloon and string weight are
negligible Balloon is a perfect sphere
with radius 0.2 m
?air 1.23 kg/m3 ?helium 0.16 kg/m3
FBWheliumWcard
Balloon card
Wcard 0.35 N