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18th April 2019, 03:45 PM | #401 |
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Like many humorless and indignant people, he is hard on everybody but himself, and does not perceive it when he fails his own ideal (Molière) A pedant is a man who studies a vacuum through instruments that allow him to draw cross-sections of the details (John Ciardi) |
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18th April 2019, 04:36 PM | #402 |
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18th April 2019, 04:37 PM | #403 |
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18th April 2019, 04:44 PM | #404 |
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18th April 2019, 04:44 PM | #405 |
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Hot air rises because temperature makes the pressure go up and this creates a pressure gradient.
http://ww2010.atmos.uiuc.edu/(Gh)/gu.../prs/hght.rxml |
18th April 2019, 04:50 PM | #406 |
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How would that solve any of the problems mentioned?
Quote:
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. |
18th April 2019, 04:52 PM | #407 |
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No, that's not how gas behaves. The pressure goes up with a rise in temperature only if the volume is constrained. There is no such constraint for air that's heated above a campfire. That's the basic gas law. Buoyancy requires a difference in density, not pressure. Hot air is less dense than cold air.
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18th April 2019, 04:58 PM | #408 |
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18th April 2019, 05:09 PM | #409 |
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Another person who shouldn't play with guns :-). The explanation goes back to F=m*a. As you are accelerating bigger mass, you get a bigger force. That simple. You may try argue the amount of energy is the same, limited by the size of the charge. Almost right, except in the case of the smaller bullet it gets out of the barrel before all the gunpowder burns. The heavier one gives it more time and the combustion is more complete - meaning more energy to do the job.
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. |
18th April 2019, 05:11 PM | #410 |
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18th April 2019, 05:15 PM | #411 |
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18th April 2019, 05:17 PM | #412 |
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18th April 2019, 05:23 PM | #413 |
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The linked information is correct, of course. It's just not the reason smoke rises. But both the smoke-rising and rocket-moving scenarios happen to have a common (wrong) explanation that follows from his poor understanding of the behavior of compressible fluids.
Quote:
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18th April 2019, 05:59 PM | #414 |
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I remember one particular interesting scout camporee. We all lit our fires in the morning and the slow rising smoke from the first burn when up 20 or so feet from the ground, then stopped rising and floated sideways. It actual floated down with the the slope of the land. The camp, which had been under a clear sky before the fires was finally covered under a really cool haze. As soon as the sun broke, the smoke cleared.
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. |
18th April 2019, 06:42 PM | #415 |
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18th April 2019, 08:38 PM | #416 |
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18th April 2019, 08:59 PM | #417 |
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18th April 2019, 09:27 PM | #418 |
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18th April 2019, 09:52 PM | #419 |
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Vote like you’re poor. A closed mouth gathers no feet" "Ignorance is a renewable resource" P.J.O'Rourke "It's all god's handiwork, there's little quality control applied", Fox26 reporter on Texas granite |
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18th April 2019, 10:18 PM | #420 |
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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? |
18th April 2019, 11:34 PM | #421 |
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19th April 2019, 12:12 AM | #422 |
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While this statement is true, it is not a key for the failure of the OP's principle. The real reason is, the smoke displays similar gradient. just nitpicking ;-).
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. |
19th April 2019, 12:25 AM | #423 |
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19th April 2019, 12:33 AM | #424 |
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19th April 2019, 12:47 AM | #425 |
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19th April 2019, 01:51 AM | #426 |
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OK, I am on a ship in the middle of the ocean. How do I use a cable?
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? |
19th April 2019, 02:16 AM | #427 |
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19th April 2019, 02:37 AM | #428 |
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19th April 2019, 02:39 AM | #429 |
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19th April 2019, 02:44 AM | #430 |
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I'm sorry your english is so weak.
Yes, we have. Not only on video and TV, but through non-visual means as well. You know that non-pixelated videos can be evidence too, right? So the exhaust would all go in the same direction, correct? And so with equal reaction, the rocket would ______________ (fill the blank). |
19th April 2019, 02:54 AM | #431 |
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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 ;-). |
19th April 2019, 02:56 AM | #432 | |||
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Cream-colored ponies and crisp apple strudels
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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/dann "Stupidity renders itself invisible by assuming very large proportions. Completely unreasonable claims are irrefutable. Ni-en-leh pointed out that a philosopher might get into trouble by claiming that two times two makes five, but he does not risk much by claiming that two times two makes shoe polish." B. Brecht "The abolition of religion as the illusory happiness of the people is required for their real happiness. The demand to give up the illusion about its condition is the demand to give up a condition which needs illusions." K. Marx |
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19th April 2019, 03:19 AM | #433 |
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19th April 2019, 04:02 AM | #434 |
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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! |
19th April 2019, 04:43 AM | #435 |
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19th April 2019, 05:04 AM | #436 |
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Ok let's go with your theory for one sec. Imagine a lot of gas released into the vacuum of space. It is unconstrained and expanding in all directions. If there were an object next to that cloud, would it be pushed even the slightest bit by the wind then the expanding cloud contacted it?
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19th April 2019, 05:18 AM | #437 |
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19th April 2019, 05:36 AM | #438 |
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"Expanding pressure" is not a thing in physics.
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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. |
19th April 2019, 06:46 AM | #439 |
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19th April 2019, 07:02 AM | #440 |
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