Why do airplanes need to fly so high? |
- Why do airplanes need to fly so high?
- Can light and sound affect each other?
- What happens when microwaves hits metal?
- If we were able to accelerated a spaceship/probe to a fraction of the speed of light would space dust start punching tiny holes through it?
- How does binary convert into light waves in optical cables?
- Why do cable TV providers still need cable boxes which stream via coaxial cable?
- How do we know the axial tilt and rotation of planets in our solar system?
- Do men have hormonal cycles?
- What is the meaningful distinction between nuclides and isotopes?
- [PHYSICS] What other elements (Also hypothetical Elements e.g. Superactinoides) are in theory usable in atomic bombs and what would be their possible radioactive damage to environment/organisms?
- Why do atomic chain reactions not happen in nature?
- If you have a perfectly thermally insulated container and add equal amounts of liquid at 0C and 100C, does the thermal equilibrium always occur at 50C?
- Whats the possibility of gaining momentum by dry firing a bow in space?
- Does the probability of pregnancy change depending on the genetic distance between two human parents?
- Why are the edges of shadows fuzzy and not sharp?
- Why is it the energy levels in an infinite well have a spacing between them with a squared pattern, but in a harmonic oscillator they are linearly spaced? What is the physical meaning behind this?
- What gives stars their color?
- An empty refrigerator vs a full refrigerator - is there a difference in power usage?
- Can you reflect presumably a "Death Star" Laser using a simple mirror?
| Why do airplanes need to fly so high? Posted: 15 Dec 2017 12:10 PM PST I get clearing more than 100 meters, for noise reduction and buildings. But why set cruising altitude at 33,000 feet and not just 1000 feet? Edit oh fuck this post gained a lot of traction, thanks for all the replies this is now my highest upvoted post. Thanks guys and happy holidays 😊😊 [link] [comments]  |
| Can light and sound affect each other? Posted: 16 Dec 2017 04:54 AM PST |
| What happens when microwaves hits metal? Posted: 16 Dec 2017 03:45 AM PST I know as much as microwaves makes molecules vibrate, and certain objects heat up faster than other, due to amount of liquid? I also know that metals reflect the microwaves, but not why and what happens to the metal.. My real question.. would it be safe to crumble aluminum foil and put it on the bottom of a bowl filled with water/soup, to speed up the heating of the liquid? [link] [comments]  |
| Posted: 15 Dec 2017 02:22 PM PST It seems that at very high speeds even minute particles in space could become dangerous. Would this make some sort of shield a necessity? [link] [comments]  |
| How does binary convert into light waves in optical cables? Posted: 15 Dec 2017 07:35 PM PST |
| Why do cable TV providers still need cable boxes which stream via coaxial cable? Posted: 15 Dec 2017 09:23 PM PST With the advent of Apple TV et al, as well as online viewing apps available from Spectrum (and I assume others), why haven't cable TV providers made their own IoT device that does the same thing as my cable box? And for that matter, why doesn't that functionality come built in to my TV? [link] [comments]  |
| How do we know the axial tilt and rotation of planets in our solar system? Posted: 15 Dec 2017 10:48 AM PST |
| Posted: 15 Dec 2017 06:10 AM PST And if so, what are they like and what causes them? Bonus: what effect does the moon have on hormonal cycles, both female and male? [link] [comments]  |
| What is the meaningful distinction between nuclides and isotopes? Posted: 15 Dec 2017 12:31 PM PST I've read several different articles on this, talked to nuke engineers, and really just failed to receive a consistent and satisfactory answer. For instance, is it proper to refer to U-238 as an isotope of uranium, or is U-238 a nuclide? I've heard the former but very rarely the latter. Are both valid? When would one be valid and the other not? Thanks [link] [comments]  |
| Posted: 15 Dec 2017 03:45 PM PST Hello! I hope I'm posting this in the right sub-reddit; if that's not the case I apologise. First off: I'd like to point out that this question is tied to me writing a fantasy/sci-fi book. So, accuracy of course would be great, but even "wild" theories are welcome! I just want to give some sort of explaination for what happens in my book instead of just far-fetching things and tell the reader "Oh well. It's just the way it is." Also my english is a bit rusty, so bear with me. Also I'm welcoming any other idea that revolves around a logical explaination for a radioactive infestation of the planet. To cut things short: Could it be possible to create a implosion type or gun-type atomic bomb with an undiscovered element or any other element except Uran/Plutonium? And if so: Is there one element that "infests" the environment for only 200-500 years? I read that Neptunium is a solid canidate to build atom bombs with and just due to historical events scientists chose not to work with this element. Book: New element found -> Crafty bomb -> Makes big boom -> Big scale enviromental desaster -> hello mutants -> yeay after ~250 years no more radiation! I know y'all probably fed up with "fallout scenarios" when it comes to literature, haha! Please help me out though. Thanks in advance guys! [link] [comments]  |
| Why do atomic chain reactions not happen in nature? Posted: 15 Dec 2017 04:15 PM PST 1 in 100 or so Uranium atoms are U-235, which is the type of Uranium necessary to cause an atomic chain reaction. If a random neutron flying through a Uranium deposit hits U-235, wouldn't that risk the start of a fission chain reaction? If so, why prevents such reaction from happening in nature? [link] [comments]  |
| Posted: 15 Dec 2017 11:42 PM PST |
| Whats the possibility of gaining momentum by dry firing a bow in space? Posted: 16 Dec 2017 03:20 AM PST |
| Posted: 15 Dec 2017 08:55 AM PST I understand that the greater genetic difference between two parents often results in hybrid vigor, making the offspring more genetically "fit". I've read studies that imply cancers are less likely, immunity to disease is better, and many other benefits when a human (and really, most other animals) is an offspring of genetically diverse parents. I was wondering, though, if that means there is some sort of trade off. Is the chance for pregnancy lower with "mixed race" couples than "same race"? Also (side question), does hybrid vigor tend to be more of a benefit post birth or have there been any studies that show genetic difference has an effect on reducing the chances of complications during pregnancy as well? TL,DR: Do pregnancies that benefit from heterosis have a better or worse chance of fertilization, or does it not matter? [link] [comments]  |
| Why are the edges of shadows fuzzy and not sharp? Posted: 15 Dec 2017 09:01 AM PST |
| Posted: 15 Dec 2017 07:38 AM PST |
| Posted: 15 Dec 2017 11:16 AM PST I've heard a lot about stars having different colors like red giants or white dwarfs. From what I understand, a star is just a huge fusion reactor that fuses hydrogen to produce helium. What is different about these stars that changes the color? [link] [comments]  |
| An empty refrigerator vs a full refrigerator - is there a difference in power usage? Posted: 15 Dec 2017 08:54 PM PST All things equal besides content, if I had an empty refrigerator and I had a refrigerator full of beer would there be a difference in the amount of energy required to keep the refrigerator at the same temperature? [link] [comments]  |
| Can you reflect presumably a "Death Star" Laser using a simple mirror? Posted: 15 Dec 2017 01:25 PM PST |
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