Posted by Mikey on Wednesday, September 1, 2010 at 11:28pm.
a) The probably want you to use
Force = Mass* aaceleration
to get the net force on the balloon, and then use
Net Force = Buoyancy - Weight
to get the buoyancy force. Once you have that, you can get the volume of the balloon using Archimedes Principle.
This approach neglects the atmospheric drag force, which might be appreciable, but perhaps not for the first 5 seconds.
b) Distance risen = (1/2) a t^2
(if a remains constant)
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