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>> No.2933082 [View]
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2933082

How the fuck is the answer not 4561N?

I got it from V_helium=(4/3)*pi*r^3=523.598 m^3
V_ballon+V_helium=523.663 m^3

Mass of displaced air: 523.663*1.28=680.289kg
Mass of balloon+helium=121+(523.598*0.18)=215.259kg

Bouyancy = 9.81*(Mass_displaced_air-Mass_total)

What is wrong?

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