My textbook says electricity is faster than light? |
- My textbook says electricity is faster than light?
- How did the mimic octopus learn the different shapes?
- How does dissolving table salt in water affect the volume of the mixture?
- What is stopping fusion reactors from lasting a long time?
- Does molten iron have magnetic properties?
- Is there any evidence to suggest that using birth control for a long period of time would delay the onset of menopause?
- My good friend is a moon landing conspiracy theorist. What is the most compelling evidence we have of successfully landing on the moon?
- Do Oysters make their shells (calcium carbonate) from carbon in the water? Does this remove carbon from the carbon 'life cycle?'
- Is the electron exactly a point particle, or does it have a finite size?
- Is a "time viewer" even remotely possible, according to our understanding of time?
- What is at the core of our sun?
- First Question: Why don't helmets break?
- Do nitrogen-based polymers exist? Not like amino acids, more like (NH)n where it looks like a carbon chain replaced by nitrogens.
- What is the minimum time needed to produce a verbal response?
- Mathematically, what goes on to make public key encryption work; a key can encrypt data but not decrypt data encrypted by itself?
- What physically causes a feeling of anxiety or nervousness? Is there anything physical, or is it all in my head?
- Are the Milky Way and Andromeda galaxies drawn to each other or do they just happen to be heading towards each other?
- Is a mature dog more intelligent than a human baby?
- Is it better to bet on a game with low chance/high prize OR high chance/low prize?
- If temperature is the average kinetic energy of particles in a substance, why is it measured in kelvin and not joules?
- How does a spider START their web?
| My textbook says electricity is faster than light? Posted: 12 Nov 2015 06:10 PM PST Herman, Stephen L. Delmar's Standard Textbook of Electricity, Sixth Edition. 2014 At first glance this seems logical, but I'm pretty sure this is not how it works. Can someone explain? [link] [1113 comments]  |
| How did the mimic octopus learn the different shapes? Posted: 12 Nov 2015 06:26 PM PST Saw this clip about the mimic octopus. Is it possible that it observes its surroundings to learn what to mimic or did they randomly try things and the ones that got lucky survive? [link] [7 comments]  |
| How does dissolving table salt in water affect the volume of the mixture? Posted: 13 Nov 2015 06:22 AM PST Assuming all of the salt is completely dissolved in water, will the solution have a greater volume than the water had? [link] [3 comments]  |
| What is stopping fusion reactors from lasting a long time? Posted: 13 Nov 2015 06:03 AM PST Reading about current fusion reactors they seem to last anywhere between seconds to minutes. [link] [2 comments]  |
| Does molten iron have magnetic properties? Posted: 13 Nov 2015 05:14 AM PST Could I wave a magnet over a pool of molten iron and pick some up? [link] [2 comments]  |
| Posted: 12 Nov 2015 02:07 PM PST It is my (perhaps flawed) understanding that menopause begins when the female body runs out of eggs. It is also my (again, perhaps flawed) understanding that birth control prevents the release of eggs. So would someone who started and consistently used birth control at 16 end up going through menopause later than someone who started at 24 or someone who never used birth control at all? [link] [5 comments]  |
| Posted: 12 Nov 2015 09:55 AM PST I got into a bitter argument with my friend the other day, because he asserted that he believes the moon landings of the Apollo missions were staged, and filmed/manipulated in the form of a movie set/scene. His primary arguments were that the intense radiation of the Van Allen belts would not permit life to make a journey as far into space as the moon, and that NASA is a huckster organization that served no purpose other than to take the tax money of common American people and give it to 'manipulative politicians and scientists'. I have told him that I believe his arguments are seemingly out there, and that there is not a significant number of professionals in the scientific community that support his notion. However, he stubbornly refuses to accept my thoughts. So I ask of you, Reddit, as someone who considers himself a laymen in the subject of space travel and its history, what is our most compelling piece of evidence for landing on the moon? Thank you. [link] [95 comments]  |
| Posted: 12 Nov 2015 09:05 AM PST Oyster shells do decay over decades in the ocean, but take much longer on the land. So do oyster farms combat the accumulation of carbon in the ocean? Follow up question. Calcium carbonate is an antacid. Do large quantities of oysters prevent the acidification of sea water? [link] [4 comments]  |
| Is the electron exactly a point particle, or does it have a finite size? Posted: 13 Nov 2015 12:34 AM PST And if the electron is finite, do scientists know an upper limit of how big can it be? [link] [3 comments]  |
| Is a "time viewer" even remotely possible, according to our understanding of time? Posted: 12 Nov 2015 08:26 PM PST https://en.wikipedia.org/wiki/Chronovisor Obviously the above example is probably rumor or myth, but the core idea is interesting. Is it truly possible to "view" the past? Or does time just not work like that? [link] [2 comments]  |
| What is at the core of our sun? Posted: 13 Nov 2015 03:33 AM PST i will start this by mentioning i was drunk when i came up with this question about a week ago, and noticed yesterday i had 0 replies, turns out the automod thought this was spam. so im trying again (with mod approval) i had just watched ep 39 crash course astronomy video and at the end he was talking about the size of the universe. i got to (drunk) thinking, HOW in a universe as unfathomably large as ours, could we ever be THE only life to have come around so far. my thoughts continued to what do we need for life (as we know it), well..
so, we obviously have all 3. NEXT THOUGHT so where did we get our heavier elements? well obviously a supernova that formed the gas cloud our star and solar system formed in. But it only forms the heavier then iron stuff in the last few moments, so relative to the rest of it, it would be a rather small amount, and blown then in EVERY direction. but wait... an iron atom would have more gravitational pull then an hydrogen atom right? so why did the sun form from hydrogen? is there a core of heavier elements? that pulled the hydrogen towards it? and eventually formed the star? or does the lightest element form the gravitational center on the solar system? so my question, started off as how could we be alone, and changed to what is at the core of a star? is it hydrogen all the way down (with now helium it has fused) or is there some kind of core formed of say iron that caused the original gravitational center of our solar system, that the sun formed around? also im not expecting a core like the Earth has, but more like towards the center there is more iron then towards the surface. [link] [comment]  |
| First Question: Why don't helmets break? Posted: 12 Nov 2015 07:47 PM PST So I got interested in American football helmets tonight and my Google search was disappointing. I was expecting to see I wide variety of different types and prototype, and to my surprise there's surprisingly little diversity. As I found out later there's awful political and legal reasons for this, as I read here here. Particularly because one of the persons mentioned in the article is know for developing racing safety equipment, the question occurred to me, why don't helmets break? I remember learning long ago how those awful race car crashes where you see with debris flying everywhere is actually a safety innovation. The pieces that fly off of the car actually take that deadly powerful energy with it, and safely away from the driver. So why haven't we applied the same thinking to helmets? The helmet is replaceable. The human is not. TL;DR Cars break into pieces to keep us safe, why don't football helmets? [link] [9 comments]  |
| Posted: 12 Nov 2015 03:15 PM PST |
| What is the minimum time needed to produce a verbal response? Posted: 12 Nov 2015 03:05 PM PST I am thinking of situations such as: you look at a screen and as soon as a big yellow circle appears you click the left mouse button; or equivalently, instead of pressing the mouse button you say "yes"; nothing complicated, you know what's coming. What is the absolute minimum time you need to produce a verbal response? [link] [3 comments]  |
| Posted: 12 Nov 2015 05:31 PM PST My first thought is that information is somehow lost, but then that would mean data is being erased/distorted, which doesn't work out... How does this wizardry happen?? Also, I recognize that this could be flaired as computing instead of mathematics, but my main focus is what mathematical concepts are in play that allow public-key encryption to work, which is why I've flaired this post into mathematics. [link] [4 comments]  |
| Posted: 12 Nov 2015 02:04 PM PST For example I'm pretty anxious right now and I feel something weird right under my ribcage, my hands are shaking, and I can't slow down to focus or think straight. I'm more interested to know if something is physically happening under my ribcage right now that makes it feel like this, but an explanation for the other parts of it would be interesting too. [link] [9 comments]  |
| Posted: 12 Nov 2015 04:52 PM PST Is the gravitational pull what's bringing the galaxies together or are they just two galaxies which happen to be heading into each other and will merge once they collide? [link] [6 comments]  |
| Is a mature dog more intelligent than a human baby? Posted: 12 Nov 2015 10:47 AM PST I always see these videos of babies playing with the family dog and it always seems to me in those videos that the dog is the more....grown up (?) being in that shot. Is there any merit to this kind of thinking? [link] [11 comments]  |
| Is it better to bet on a game with low chance/high prize OR high chance/low prize? Posted: 12 Nov 2015 06:22 PM PST I am basically asking whether there is a standard way to measure how "risky" a game is. I have a particular game in mind, which motivated my question. It's a simple game, but it takes a little bit of explaining to make everything clear. Game setup: In World of Warcraft, there is a gambling mod which allows members of your party to enter and win up to some pre-determined amount G in gold. Each round, players are asked to join, and so you can play 1 round only, or 1 round, skip 1, then play another. The number of players in each round is variable (call it N). Once the entrance is complete, each player executes the command "/roll G", which generates and displays to everyone a random integer from 1 to G. The winner is the player who rolled highest. The loser is the player who rolled lowest. All other players do nothing. The loser must pay the winner the difference in their rolls in gold. So if G = 100, winner rolls 87 and loser rolls 13, the loser pays the winner 74 gold. Some calculations that are not too difficult to compute, for fixed N and G:
(We can just set G = 1 and imagine we can roll any real number between 0 and 1 just to make formulas nicer looking. The max payout G just multiplies all winnings. Also, for simplicity, I assumed in the above calculations that we actually roll any real number from 0 to G. So your roll is uniformly distributed on the interval [0,G] instead of being uniformly distributed on the integers from 1 to G. In practice, the value of G is on the order of tens or hundreds of thousands,so I didn't think that simplification would really change anything.) On any given round, you are expected to break even, which means if we fix N and play many many rounds, any particular player should on average have a net loss/gain of 0 gold. (I suppose it might be different though if the number of players change from round to round?) Question: Is it better to gamble when there are few people playing or many people playing? If there are few people, your expected payout is small but your chance of winning (or losing) is high. If there are many people, your expected payout is large, but your chance of winning (or losing) is low. Since your expected payout on any round is 0, that should say that you should be indifferent to playing, no matter how many people join. Is that actually right? What is a good way to measure your risk in this case? [link] [7 comments]  |
| Posted: 12 Nov 2015 04:20 PM PST |
| How does a spider START their web? Posted: 12 Nov 2015 06:40 AM PST I've seen videos of them 'building' webs but I cant find anything that shows how they get the first strand in place. You see those massive web strands going from a tree/lamppost/whatever and it stretches about 2-3+ meters horizontally across to another point. Do they swing, fly, shoot it? How do they get from A-B? [link] [7 comments]  |
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