Science
37 watchers
Nov 2023
8:55am, 15 Nov 2023
2,887 posts
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Mushroom
Although I understand how a plane flies, I'm still like a kid when I watch one take-off, particularly a big 747. Just amazing.
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Nov 2023
8:57am, 15 Nov 2023
82,609 posts
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Diogenes
That's a bit like something I used to wonder about: If you jumped up while on an aeroplane in flight, would you land on the same spot on the floor? And, if you could stay in the air long enough, would you get hit by the rear bulkhead? Apparently the answer is no as the plane has it's own sealed atmosphere (or something like that) and carries you along with it. But, if that is the case, what force is acting on you when you are in the air? Momentum? |
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Nov 2023
8:57am, 15 Nov 2023
82,610 posts
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Diogenes
(that was following on from the train question)
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Nov 2023
8:59am, 15 Nov 2023
48,430 posts
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HappyG(rrr)
I enjoy explaining faster moving air generates low pressure and slower air high pressure, producing a force that pushes from high to low in... sailing! The shape of a sailing boat's sail is deliberately curved like a plane wing, so that the force pushing the boat forward is greater than just the "reaction" of resistance of the sail to the direction of the wind. Hence the boat can go faster than the wind speed!  G
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Nov 2023
9:54am, 15 Nov 2023
24,305 posts
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richmac
Even in the video of where zero G is induced in aircraft to train astronauts, for the time they are weightless they don't zoom to the back of the cabin.
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Nov 2023
10:24am, 15 Nov 2023
48,436 posts
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HappyG(rrr)
It's not the sealed air thing, it's conservation of momentum. When you jump or float up, you already had the same forward momentum as the plane, therefore you keep going forward at same speed as the plane. Newton's first law. G
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Nov 2023
10:43am, 15 Nov 2023
3,285 posts
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cackleberry
Quietly lurks... Any biologists or microbiologists or botanists? Animal pathologists hiding in among the physicists and chemists?? Microbiologist here, specialising in avian pathology. Previously worked in wet chemical labs as a QC Chemist, making industrial cleaning chemicals. Science is amazing! I love telling people about it, and learning new things myself. Always something new going on. |
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Nov 2023
11:00am, 15 Nov 2023
24,307 posts
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richmac
My question is how the f*ck do they make soft contact lenses ? I mean making a permeable membrane that's sanitary enough to go on your eye is the easy bit (for chemists) but how the actual do you then make is a tuned lens ?
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Nov 2023
11:01am, 15 Nov 2023
2,483 posts
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MudMeanderer
Some of you may like this site https://fyfluiddynamics.com/. Started as a website sharing interesting fluids experiments and demonstrations during a PhD and Nicole Sharp kept it going afterward.
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Nov 2023
11:01am, 15 Nov 2023
2,484 posts
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MudMeanderer
fyfluiddynamics.com Try that link again |
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