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http://ww2010.atmos.uiuc.edu/(Gh)/gu.../prs/hght.rxml |
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Explain how three antennas spanning nearly 100 kilometers can aim a sub-degree radio beam at the same spot in the sky and communicate freely at any arbitrary time of the day or night using "google earth airplanes." Keep in mind I will be asking you to do the actual parallax calculations. |
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Any thoughts on balloons in space? |
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In the case of "no bullet at all" a lot (if not most) of the propellant will get out before it burns and the efficiency will be very small. Automatic weapons may not function for that reason - a "blanks attachment" may be needed to solve the problem. Note; in that case all the forces are confined inside the barrel and no outside "support" of some kind is involved. |
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Presumably a temperature inversion with the cool air flowing downstream, under the warmer air above, toward the nearby river. It was a great example for a 13 YO. |
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I hope I've been able to use the quote function correctly. Let's see. |
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:D |
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This is rocket science after all. |
I was disappointed that JayUtah didn’t answer this, so here’s you answer.
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This you tube video proves Gingervytes wrong:
(Space X Heavy Launch) https://www.youtube.com/watch?v=vF_2kYAwMGw T+00:03:43 (20:40 into the video) Stage 2 Engine start up. Look at the lower left corner, you see speed and altitude. T+00:27:38 (44:38 into the video) Stage 2 restart, at 199Km (123Miles) Notice the speed indicator rapidly increasing. Absolute proof that rockets work in space. Oh, BTW, I think I found a Jay Utah typo. In post #351 next to last sentence, I think he meant right end cap, not left. Do I get a T shirt?:D |
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And more as a matter of interest: depends on what we call "negligible". A basic barometric altimeter (I have several) has resolution of 1m, something what may come as a surprise to some. |
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Dave |
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Hans |
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Why are my communications and data routed through a satellite dish on top of the bridge? What is the dish pointing at? the nearest aircraft is thousands of miles away. My navigation relies on GPS which uses a sat dish on the roof of the bridge. where does it get a signal? Why doesn't GPS work exactly as described? |
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Your hypothesis predicts that hot air will move outwards in all directions, not just up. |
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Gingervytes:
"Lets say a 75kg person lifts a 100kg weight and he drops it from a height. Why doesn’t that person get lifted off the ground? Isn’t the weight mass?" The keyword is "drops". The person is not exerting any force on the weight. He is simply letting gravity to do its job. If he "pushed" the weight down while it was falling to accelerate its descent over 9.81m/s^2, he could achieve a point where he would lift himself from the ground. I don't think anybody is fit enough to achieve this though ;-). |
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Doorbells and sleigh bells And schnitzel with noodles Wild geese that fly with the moon on their wings These are a few of my favorite things
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Just posting to add my thanks to the scientists and rocket scientists who refute nonsense with sense and facts. It is so interesting to read even though I can't actually understand most of it.
ETA I did not notice before writing, but I think that's an appropriate, i.e. in science, post to reach 3,600! |
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(1) And in the case of a rocket ... what? (2) Pressure expands? Did you mean pressure increases? Or maybe gas expands? (3) The rocket pushes it? What is it? Pressure? If so, it makes no sense. |
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Does the exhaust from a rocket expand equally in all directions? Come on, it’s a simple enough question, requiring only a single word to answer it. |
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Here's the link. http://www.internationalskeptics.com...2#post12668972 Try again. Yes, it's lengthy. That's because it's thorough. It starts from basic principles and takes a methodical, step-by-step inductive approach to show how "pressure gradient force" actually works in a rocket. |
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