Helium
Today's Story on CHILDREN: Sometimes we expect too much from our children. Expectations can confuse us. Try and pick up on the clues and cues that our children give us. BUGS LIKE FIREWORKS On the fourth of July, my wife and I went a couple of blocks from our house to a huge hill where we could enjoy the view and the fireworks, not only from the town we live in but from nearby towns as well. It was a hot night but there was a wonderful breeze, and you could see a long way in all directions. It wasn't as visible as if we were right there where they were shooting them off, but we could still get a good view of the festivities. I wanted to see Caleb's (my 3 year-old boy) reaction to the fireworks. He sat with us all of two minutes before he started tumbling down the hill and giggling. 'Caleb, come here, ' I shouted over. He would reluctantly come back by us and sit for a spell. 'See the pretty colours over there?' 'Oooohhhhhh!, ' he replied, all the while looking in different directions from where the fireworks were actually going off. 'Heeeee heeeeee!' He giggled as he tumbled down the steep hill again. 'Caleb, come here and watch with Daddy, ' I said. 'Okay Daddy, ' he replied. Back up the hill he would come. I tried getting him to concentrate on the fireworks again. He watched for another twenty seconds before he started walking away from us. Suddenly he let out a squeal of delight. Finally he was enjoying the fireworks I thought. He yelled out, 'Look at the lightning bugs!' I sighed and looked down the hill as indeed there were literally hundreds of fireflies that were stealing Daddy's thunder. I tried in vain one last time to get him to watch with me. 'Caleb, tell me what colours you see?' I asked. 'That's a green one Daddy! And a red one!' he spoke back in a jolly mood. This lasted another ten minutes or so before he started tickling Connor (our 11 month old) in his stroller. Then he was off tumbling down the hill again saying, 'Whoa, whoa, whoa, whoa.' I started to call out to him again when Kristi, my beloved bride, leaned over to me and whispered, 'Michael, just let him be a kid. There will be other years.' I had been getting so irritated that he wouldn't sit by us and take in the fireworks. I guess I had a preconceived notion that he would sit on my lap and just squeal with delight every time one exploded. Then he was going to ask me if they were magic, so that his proud Daddy could stick his concave chest out, and explain away. Luckily my understanding wife was there and was able to gently nudge me back to reality. Once again my impatience was getting in the way, I was expectant when I shouldn't have been. I should have picked up upon the clues and tumbled down the hill with him. Fireworks have been around for hundreds of years but my boy was only going to be three years old a few more months. I guess I should follow my sons lead. He has a fourth of July every day!" (Michael T. Powers) QUOTE: "Children might or might not be a blessing, but to create them and then fail them is surely damnation. (Lois McMaster Bujold, "Barrayar", 1991).
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Question 1. Bill and Bob have been testing a new aluminised PET (Polyethylene Terephthalate) film and they no?
Question 1.
Bill and Bob have been testing a new aluminised PET (Polyethylene Terephthalate) film and they now use the material to make helium filled balloons. Bill?s balloon is less inflated than Bob?s, and the latter jokes about it. However, Bill insists he has to be careful because if he were to take the balloon on hills and mountains, the atmospheric pressure would decrease and the balloon would expand and burst. Bill then makes a bet that he can walk, drive or climb somewhere high enough for his balloon to burst...
The balloons are partially filled with helium and they unfold as helium expands into them. The balloons burst once they reach a volume of 22.0 dm3; the pressure and temperature of the helium inside the balloons are always equal to the surrounding atmospheric pressure and temperature. Bill and Bob added respectively 8600 cm3 and 18000 cm3 of helium in their balloons, by the sea side where the altitude is 0 meters, the temperature is 25.0oC and the atmospheric pressure is 760mm Hg.
The conditions on Mount Everest during climbing season are typically: P = 0.330atm and
T = -20.0oC.
(a) Calculate the volume that would be occupied by the helium in Bill?s balloon on Mount Everest (3 sig. fig.). Can Bill ever hope to win his bet?[3 marks]
(b) The dependence of the atmospheric pressure with altitude can be approximated by the following formula:
Patm = -7.57x10-2 h + 1
where h is the altitude in km, Patm is the atmospheric pressure in atm.
Calculate the altitude at which Bob?s balloon would burst, assuming that the temperature remains constant and equal to 250C (3 sig. fig).
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Hi,
This is a pretty basic question
I'm being asked to use Graham's Law of Effusion to find out why balloons filled with air deflate slower than those filled with helium
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On the one hand, air has a high percentage of N2, so do I use the molar mass of nitrogen?
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Both would give different answers and even though my method would be correct, I'd like to get the right final answer
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Calculate the temperature and pressure of the helium gas. HELP!?
I am really stuck on this classical physics question for my mock exam paper that I am working on from home. If anyone can shed any light on this for me I will be very grateful.
The information provided is the following:
"A sealed container of volume 0.10m^3 holds a sample of 3.0 X 10^24 atoms of helium gas in equilibrium. The distribution of speeds of the helium atoms shows a peak at 1100 ms^-1"
The question is:
Q. Calculate the temperature and pressure of the helium gas.
I have been working on this paper for 2 days now and cannot seem to reach a conclusion with this question. Can anyone help me please??
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