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osker246
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Homework Statement
your team is in charge of launching a large helium weather balloon that is spherical in shape, and whose radius is 3.0 m and total mass is 17.5 kg (balloon plus helium plus equipment).
(a) What is the initial upward acceleration of the balloon when it is released from sea level?
(b) If the drag force on the balloon is given by the equation below, where r is the balloon radius, ρ is the density of air, and v is the balloon's ascension speed, calculate the terminal velocity of the ascending balloon.
Homework Equations
V=(4/3)Pi*r3
F=ma
density of air = 1.29 Kg/m^3
density of He = 0.1785 Kg/m^3
g= 9.81 N/Kg
The Attempt at a Solution
I am attempting to do this online homwork and the first hint they give is to draw a FB diagram of the three forces acting on object. From what I think i know the 3 forces are...
Fair pushing up on balloon + FBuoyancy balloon -Wballoon=ma
is this correct?
If so I know the Weight=mg, so that's done. But I am not too positive about Fair pushing up on balloon + FBuoyancy balloon. Now does Fair pushing up on balloon= Vballoon*densityair*g? Also assuming the volume of the sphere is completely filled with helium, does FBuoyancy balloon=VHe*DensityHe*g?
If somebody could help me out I would greatly appreciate it. I am not quite sure if I know what I am doing here...