Exercise 2/95
| A Balloon has no gas with basket are combined weight totally 500 kg. How much gas helium filled when the ballon can float motionless in the air? Solution  Owning to the air is fluid, balloon floating in the air acts same as the buoyant force does inside the water. While the ballon floating in equilibruim(net force act to the balloon is zero.) Buoyant force  acting on the balloon is equal to theweight  + balloon with a basket "W" |
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Ans.
Gas helium is filled 485 cubic m.
| Exercise 1/92 Maker |
| Explorers travel by a gas balloon. Before he sets off, he has filled a helium gas which has volume 400 cubic metre and a mass of 65 kg. While a gas balloon is flying, how many density is the gas balloon occupied? |
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| Solution 1. We get V = 400 cubic metre, m = 65 kg. 2. We want to know the the density [Rho (ρ)] 3. We pop up the formula ; ρ = m/v Then ; the density is  |
| While a gas balloon is flying, the density of the gas balloon is 0.16 kg/cube meter. Ans. ρ=0.16 kg./cube meter |
| Remark |
| 1. Answer is possible. Why? Because the "ρ" of the weather is average 1.2 kg./cube meter. If the gas balloon is flown, it must have the density ("ρ") lower than the density ("ρ") average of the weather. 2.Noted that aluminum has a lower density compared to other metals, therefore airplane is made of aluminum. In addition, Aerogel is the world's least dense solid.   |
| How can the airplane fly? |
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