A Conversation for SEx - Science Explained
SEx: wind velocity
kea ~ Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small, unregarded but very well read blue and white website Started conversation Jul 30, 2010
If you have a car travelling at 80km/hr into a head wind of 50km/hr, is the pressure on the windscreen equivalent to driving at 130km/hr on a still day, or a not moving car facing a wind of 130km/hr? Or have I got that completely wrong and if so why?
SEx: wind velocity
Gnomon - time to move on Posted Jul 30, 2010
You are right. It is the equivalent of 130kph. It doesn't matter whether the car is moving the air stationary, or the car stationary and the air moving, or anything in between. The pressure is the same.
There's a thing called Newton's Principle of Relativity, which says that you can't tell what speed you're going at if you're going at a constant speed.
SEx: wind velocity
kea ~ Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small, unregarded but very well read blue and white website Posted Jul 30, 2010
>>you can't tell what speed you're going at if you're going at a constant speed.
Why not?
SEx: wind velocity
Gnomon - time to move on Posted Jul 30, 2010
Because the results are the same if you are stationary and the outside is moving.
SEx: wind velocity
Xanatic Posted Jul 30, 2010
Wasn´t it Galileo saying that? That no experiment you can do will tell you wether you are moving or stationary.
SEx: wind velocity
Gnomon - time to move on Posted Jul 31, 2010
Well, it's called Newton's Principle. But it's quite possible that Galileo and others said it. I don't think Galileo ever said anything original; if he said it, then others said it before him.
SEx: wind velocity
Taff Agent of kaos Posted Jul 31, 2010
so what happens with you traveling at 30 and you have a tail wind of 30???
SEx: wind velocity
Xanatic Posted Jul 31, 2010
In that case I think the air pressure on the windscreen will be the same as if you were stationary.
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SEx: wind velocity
- 1: kea ~ Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small, unregarded but very well read blue and white website (Jul 30, 2010)
- 2: Gnomon - time to move on (Jul 30, 2010)
- 3: kea ~ Far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the Galaxy lies a small, unregarded but very well read blue and white website (Jul 30, 2010)
- 4: Gnomon - time to move on (Jul 30, 2010)
- 5: Xanatic (Jul 30, 2010)
- 6: Gnomon - time to move on (Jul 31, 2010)
- 7: Taff Agent of kaos (Jul 31, 2010)
- 8: Xanatic (Jul 31, 2010)
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