Question

the volume of a balloon is 1000m^3.It is filled with helium of density 0.18kg/m^3.how much load it can lift
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Answer 1

The volume of the He gas is, V = 100 m3
When a body of density ρ, volume V is immersed completely in a fluid of density σ then,
σ = 1.29 kg/m3 and ρ = 0.18 kg/m3
The observed weight of the body = W - w = Vρg - Vσg
according to question: WNet force = W - w = Vρg - Vσg = Vg(0.18 - 1.29) = - 1087.8 N
Net force in the upward direction = 1087.8 N
It can lift a load having weight less then 1087.8 N


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Answer 2

Answer:

The volume of the He gas is, V = 100 m3

When a body of density ρ, volume V is immersed completely in a fluid  of density σ then,

σ = 1.29 kg/m3  and  ρ = 0.18 kg/m3  

The observed weight of the body = W - w = Vρg - Vσg

according to question:  W<w  (ρ<σ)

Net force = W - w = Vρg - Vσg = Vg(0.18 - 1.29) = - 1087.8 N

Net force in the upward direction = 1087.8 N

It can lift a load having weight less then 1087.8 N

Explanation: