What did the SapceX Falcon 9 rocket launch look the way it did? |
- What did the SapceX Falcon 9 rocket launch look the way it did?
- Why are so many mathematical constants irrational?
- Does listening to audio with one ear or watching something with one eye have an effect on how the information is processed/remembered?
- How do current concepts of fusion reactors manage to have both a super-heated plasma and super-cooled magnets right next to each other?
- How can super low frequencies of electromagnet radiation (eg. radio waves) and super high frequencies of electromagnetic radiation (eg. gamma rays) pass through walls, but the frequencies in between can't?
- Does changing temperature have "inertia?"
- Why does firing clay prevent water from making it malleable again?
- When designing ultra large buildings, LIDO and LHC, do architects have to take the curvature of the Earth into account?
- When i kick a bucket of water (tranfering energy to it) and the water swirls arround. when it settles, where does the energy go? Does the water get warmer?
- Apart from Pluto being small what made them decide to change the status of the planet?
- How do cell towers send unique data streams to thousands of phones simultaneously?
- Why don't the electrons in the wires that power your household appliances get disturbed by radio waves the way electrons in an antenna do?
- How dangerous are the gravitational waves from two merging black holes if orbiting nearby?
- How much energy is there in a single nuclear rod?
- A question about Fermat's Principle of Least Time: what is the proper way to think about "what happens" when light moves to satisfy a global, rather than local, optimization problem. Do you take it as a given behavior of light, an axiom, or as something that can be further explained?
- What tests are performed to evaluate the quality of household disinfectants?
- How do websites check to see how secure your password is?
- Does empty space or a void have a temperature, and if so what would be required to raise the temperature of a void?
- What does it mean for a particle to have a charge?
- What causes the glowing bubble around Falcon 9?
- Will a positively charged object attract a neutral object?
- How would one apply shell theorem (if at all) to an incomplete shell?
| What did the SapceX Falcon 9 rocket launch look the way it did? Posted: 23 Dec 2017 08:18 AM PST Why did it look like some type of cloud, is that just vapor trails or something else? (I also don't really know what flair I should add so I just put the one that makes the most sense) [link] [comments]  |
| Why are so many mathematical constants irrational? Posted: 23 Dec 2017 10:17 AM PST |
| Posted: 23 Dec 2017 12:05 PM PST |
| Posted: 24 Dec 2017 02:34 AM PST As far as I know we wouldn't be able to fly a spaceship very close to the sun due to (among other reasons), not having the necessary technology/materials to shield against the heat properly. Then how come we can do it in a fusion reactor, on a much more extreme scale? I realize the vacuum helps, but that would be the case in space too. Meanwhile the plasma is hotter than the sun, and the magnets are cooler than the inside of a spaceship would have to be. What am I missing? [link] [comments]  |
| Posted: 24 Dec 2017 12:23 AM PST |
| Does changing temperature have "inertia?" Posted: 23 Dec 2017 08:54 PM PST When anything with mass, let's say a liter of water, changes temperature, can that change in temperature have any sort of "inertia?" For example, if I boil a liter of water, and then put it in a freezer that is exactly 0°C; does the temperature simply fall to zero, or can it build "inertia," that would cause the water's temperature to dip below zero, and then effectively "rebound" and settle at 0°C? [link] [comments]  |
| Why does firing clay prevent water from making it malleable again? Posted: 23 Dec 2017 08:01 AM PST |
| Posted: 23 Dec 2017 09:19 PM PST |
| Posted: 23 Dec 2017 10:36 AM PST |
| Apart from Pluto being small what made them decide to change the status of the planet? Posted: 23 Dec 2017 09:32 PM PST |
| How do cell towers send unique data streams to thousands of phones simultaneously? Posted: 23 Dec 2017 07:20 PM PST It seems like there are too many phones in a city to use unique radio frequencies without heavy interference between signals. [link] [comments]  |
| Posted: 23 Dec 2017 11:14 AM PST What's the difference? Also I know electrons in wires "crawl" really slowly along the wire, is this the case with an antenna as well? (i always imagined electrons "sloshing" up and down the full length of an antenna, moving really fast) [link] [comments]  |
| How dangerous are the gravitational waves from two merging black holes if orbiting nearby? Posted: 23 Dec 2017 01:45 PM PST For example let's say a planet was orbiting two black holes that are merging (how likely a thing like this actually is besides that point but an interesting question too none the less). Would the extreme stretching and compressing of spacetime doing something akin to the Roche limit and tear this planet apart, at least temporarily? I presume the answer depends on the mass of the two black holes and the self gravity of the planet. But in general if the answer is yes being nearby two merging black holes would be extremely dangerous, could a neighboring solar system that contains life suffer a mass extinction or total extinction if their system is say 4-6 light years from the two merging black holes? Could a merging of two supermassive black holes produce gravitational waves strong enough to not only tear apart gravitationally bounded objects but also tear apart chemically bounded objects; spaghettification? [link] [comments]  |
| How much energy is there in a single nuclear rod? Posted: 23 Dec 2017 01:42 PM PST We temper the energy released in nuclear reactors with control rods, which reduces the potential energy we can use from the rods emissions, but how much potential energy do nuclear rods contain before being used in nuclear power stations? [link] [comments]  |
| Posted: 23 Dec 2017 07:27 PM PST When introduced to the concept, I was told that the light somehow "knew" to act like this, and that we can essentially take that as a property of light, axiomatically. Then I was told that it can be explained as a consequence of Huygen's Theorem and constructive interference (although, I was never shown the explanation). Then I was told that in QED, it again is just taken as an axiom! What do you think is the most physically reasonable way to justify this apparent global-not-local character that light has? Is it really just an axiom you take as true? [link] [comments]  |
| What tests are performed to evaluate the quality of household disinfectants? Posted: 23 Dec 2017 10:41 AM PST Household cleaners (Clorox, Lysol, etc) often claim to kill "99.9% of all germs." However, upon inspection, it is not immediately clear what is meant by that number. Given that it is practically impossible to test a disinfectant on every known strain of infectious agents, it stands to reason that a certain subset of infectious agents are purposefully grown and subjected to the disinfectant, and the number of live cells left after exposure quantified. It is therefore reasonable to assume that "germs" in this context refers to the tested strains. This logic leads to the following questions:
TLDR: How can I know one disinfectant is more effective than another for general purpose household use? [link] [comments]  |
| How do websites check to see how secure your password is? Posted: 23 Dec 2017 09:20 PM PST On the other hand, how do programs hack into your password? Do they start off with numeric and turns into letters shouldn't "password" be a pretty safe password? [link] [comments]  |
| Posted: 23 Dec 2017 08:08 PM PST |
| What does it mean for a particle to have a charge? Posted: 23 Dec 2017 07:41 PM PST I'm struggling a little to put this question into words, so I hope that it makes sense. I understand that a proton has +1 charge, an electron -1, &c. But what does that mean for the particle? Does that mean something beyond the repulsive effect between particles with opposite charge? [link] [comments]  |
| What causes the glowing bubble around Falcon 9? Posted: 23 Dec 2017 07:26 AM PST As seen in this post: https://www.reddit.com/r/space/comments/7llwef/my_view_of_the_space_x_falcon_9_rocket_launch/ [link] [comments]  |
| Will a positively charged object attract a neutral object? Posted: 23 Dec 2017 05:08 PM PST Imagine that you have one rod of copper and one rod of wool and you rub them against eachother, will the wool attract something like paper now? [link] [comments]  |
| How would one apply shell theorem (if at all) to an incomplete shell? Posted: 23 Dec 2017 05:01 PM PST In a typical 2-D shell theorem problem, an object outside the shell views the shell as equivalent to a point-mass, and once inside the shell the gravitational forces cancel out entirely. This got me thinking a bit about how the mechanics would change if the small gap through which the external object would enter, normally hand-waived away as being insignificant and/or virtual, was actually a legitimate structural element of the shell i.e. the shell had a small arclength removed (let's say corresponding to a small angle theta). How would this impact the interaction between the two objects? I expect the outward-facing interaction would be similar, but would the object now experience a net force within the incomplete shell? Would that force drive the object to the center of mass of the shell, and if so can that location be calculated by finding the centroid of the circular segment? [link] [comments]  |
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