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`        A balloon of diameter 20m weighs 100 kg. Calculate it's payload if it is filled with He at 1 atm and 300K. Density of air is 1.2 kg/(m^3).`
7 years ago

47 Points
```										weight of ballon = 100 Kg
displayed air by this ballon = density of air*volume of ballon
= 1.2 kg/(m^3) *  4/3 * Pi * 10^3
= 5026.55 Kg
Byuoncy Force = 5026.55 * g (upward direction)
weight of gas inside ballon = molecular weight of He * (PV)/(RT)
= 4*10^(-3)*(1*4/3 * Pi * 10^3)/(.082*300)Kg
=681.10*10^(-3) Kg

total upward force = total downside force
Byuoncy Force= payload+force of weight of ballon's gas+force of weight of ballon
5026.55*g = payload(N) + 681.10*10^(-3) g  + 100 g
681.10*10^(-3) g is very small quantity so we can neglect this

==> 5026.55 * g = payload(N) + 100 * g
==> payload(N) = 5026.55 * g - 100 *g
=4926 * g

```
7 years ago
Tushar Sharma
11 Points
```										Weight of balloon=100kgVolume of balloon=4/3*pie r cube                                 =4/3*22/7*(20/2*100)                                 =the whole cube                                =4190*10 raise to 3 litreWeight of gas (He) in balloon=PVM/RT=1*4190*10raise to 3*4/0.082*300=68.13*10 raise to 4 gramsTherefore total weight of gas and balloon=68.13*10raise to 4+10*10raise to 4=78.13*10raise to 4 gramsWeight of air displaced=1.2*4190*10raise to 6/10raise to 3=502.8*10raise to 4gramsTherefore payload=weight of air displaced -(weight of balloon + weight of gas)Payload=502.8*10 raise to 4-78.13*10raise to 4=424.67*10raise to 4 grams
```
2 months ago
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