We encounter static electricity all the time and it's not shocking (sorry) because we know what's going on, but what on earth did people think was happening before we understood electricity? |
- We encounter static electricity all the time and it's not shocking (sorry) because we know what's going on, but what on earth did people think was happening before we understood electricity?
- Is there an economic mechanism that prevents a few entities from acquiring all of the housing and renting it out?
- Why don't we sneeze in our sleep?
- Is reinforced concrete able to function as a faraday cage? And if so does it make a building save of EMPs?
- In the event of a nuclear war (with humanity's current arsenal being used) How long would it take for the bioshpere to regenerate? (if it would at all)
- Far away galaxies recede from us at a speed proportional to their distance... but what are their speeds relative to the cosmic microwave background?
- What does it mean to say that waves in the electric field move perpendicular to waves in the magnetic field?
- Is bonding angle between atoms in a crystal changed significantly under mechanical strain?
- Unlocking my door made my headphones stop working?
- Is wearing Bluetooth headphones all day dangerous to our health?
- Is the sun's hydrogen (both deuterium and tritium) metallic and how would fission of metallic hydrogen differ from gaseous hydrogen?
- How would you measure the speed of light using typical household appliances and materials?
- When someone calls my cell phone, how does the telecom infrastructure "find" my phone?
- Artificial gravity is possible?
- Time dilation while accelerating?
- How is the risk of earthquakes determined?
- Where exactly are the nodes of a free vibrating rod?
- Why is a grossly over expanded nozzle more efficient than a slight over expansion?
- What did the invention of computing do for Mathematics?
- You can use the inverse of addition, multiplication, and exponentiation to expand the set of numbers you work with: natural numbers -> integers -> rationals -> reals -> complex numbers. Why does this pattern suddenly stop with exponentiation?
- Why does a liquid run down the side of a glass when pouring it?
- Why is it cold in space but temperatures differ on planets?
- There is an absolute zero, but why isn't there an "absolute hot"? If nothing can travel faster than the speed of light, wouldn't "absolute hot" be the heat of a thing assuming the molecules in the thing are traveling at the speed of light?
| Posted: 12 Jun 2017 05:41 PM PDT |
| Posted: 12 Jun 2017 08:50 AM PDT It seems like it would be possible for extremely wealthy individuals and companies like Blackstone to just continually acquire housing and then leverage rent-backed securities and inelastic demand to rent that housing out indefinitely, which would create scarcity in housing that can be purchased, which would further drive up the cost of ownership and force more people to be stuck renting. Is there some economic principle that will prevent this or has prevented it before? Are we heading towards a future where nobody owns their home? [link] [comments]  |
| Why don't we sneeze in our sleep? Posted: 12 Jun 2017 08:47 PM PDT |
| Posted: 12 Jun 2017 01:47 PM PDT Does the steel inside reinforced concrete form a faraday cage if you build a building? If so, does it prevent electronics from being damaged from an EMP if it is inside such a building? [link] [comments]  |
| Posted: 13 Jun 2017 07:10 AM PDT I guess I should define regenerate. Let's say, pre-war levels of habitability for humans, and animals. Though knowing chernobyl, animals couldn't give a bother about radition. [link] [comments]  |
| Posted: 13 Jun 2017 04:25 AM PDT So when it comes to cosmology we (non astronomers) are always told that expansion of the universe is like a cake leavening in an oven: pieces of chocolate get their distance to each other increased even though they don't move through the dough. Or like fish swimming in a fast flowing river, so that even if they swim slowly through the water the current carries them at a higher speed. Please take it easy because in Engineering school we're only taught SR, not GR. My current understanding is that the Big Bang happened everywhere. Anyone on any galaxy would see him/herself as the center of the observable universe because all galaxy clusters recede from each other. Does this all imply that their speeds relative to the CMB are low or nearly at rest? (Ours is just 630 km/s which is almost nothing at a cosmological scale) Cosmology always blows my mind. [link] [comments]  |
| Posted: 12 Jun 2017 05:50 PM PDT The pictures in my textbook show them as two transverse waves, but that doesn't quite make sense to me. Which way is 'up' to the electric field? [link] [comments]  |
| Is bonding angle between atoms in a crystal changed significantly under mechanical strain? Posted: 12 Jun 2017 11:37 AM PDT For example, does slightly bending a metal bar significantly change the crystal structure? [link] [comments]  |
| Unlocking my door made my headphones stop working? Posted: 13 Jun 2017 07:25 AM PDT The door to my flat has a magnetic locking system that uses a keycard to open, much like most modern hotels use. Today, I arrived at my door whilst listening to music on my phone through pretty standard in-ear headphones. At the exact moment I unlocked the door (simultaneous with the green light on the lock indicating this), my music went completely silent. The volume on my phone was still up, but no sound was coming out. Was this a well-timed coincidence or did some sort of reaction take place? The headphones worked absolutely fine after re-plugging. [link] [comments]  |
| Is wearing Bluetooth headphones all day dangerous to our health? Posted: 13 Jun 2017 07:02 AM PDT My dad will not let me use wireless bluetooth headphones because he is CONVINCED they are cancer causing. Can I have help accumulating proof that he is wrong. There are a lot of websites that look very questionable and few that are known for credibility; please help. Thank you [link] [comments]  |
| Posted: 13 Jun 2017 05:20 AM PDT |
| How would you measure the speed of light using typical household appliances and materials? Posted: 12 Jun 2017 02:13 PM PDT |
| When someone calls my cell phone, how does the telecom infrastructure "find" my phone? Posted: 13 Jun 2017 12:56 AM PDT I can be anywhere in the country and a lot of places around the world and I will still receive calls in a matter of seconds. The cell towers can't possibly scan every single phone in the world looking for mine. I have an area code but the number works just as well if I'm not in my hometown. So how do the computers and companies that run these things figure out where I am and where to send the phone call so quickly? [link] [comments]  |
| Artificial gravity is possible? Posted: 12 Jun 2017 07:58 PM PDT Is it possible, and if so how can you create artificial gravity in space like they have in the movies, if so why haven't they? [link] [comments]  |
| Time dilation while accelerating? Posted: 13 Jun 2017 02:13 AM PDT I'm not sure if this is the right subreddit, but here goes; When an object is accelerating at a significant speed, can I compute the time dilation effect by using the average velocity of the object while it's accelerating? (My understanding of physics is basic, please don't crucify me if I make glaring mistakes) Lets say I have an object accelerating at a rate of 2000 g's to .8c (takes around 204 minutes relative to the object), and I wanted to figure out the dilation of time while it's accelerating. My intuition (and my 2 in AP Physics) tells me that I can simply divide the final velocity by 2 (.4c), and use that in the equation in the time dilation equation 1/(Square root of (1-( v2 )/( c2 ))). So substituting v for .4c and solving like that gives me 1/.774, which when figuring the total time dilation gives me 263 minutes total for an outside observer timing the total length of time it took to accelerate to .8c. I cannot see any flaws in my math, and yet I feel like this answer just isn't right because it seems too simple. Can anyone tell me if I'm on the right track with this? [link] [comments]  |
| How is the risk of earthquakes determined? Posted: 12 Jun 2017 07:57 PM PDT I was reading about various natural disasters which got me thinking about how we go about understanding which faults are under particularly sever stress or are points or areas at high risk for earthquake. I assume the question has been asked before but a quick search didn't show what I was asking so if you have a link to a previous thread where this is discussed that would be sufficient. [link] [comments]  |
| Where exactly are the nodes of a free vibrating rod? Posted: 12 Jun 2017 07:45 PM PDT According to one source the nodes of a vibrating rod are about 22% from either end. Why "about 22%"? Unfortunately they don't give any explanation and I could only find calculations for rods that are fixed at one or both ends. I wonder: What is the exact number for a free vibrating rod and how can it be calculated? If the middle of the rod and both ends are antinodes (i.e. points with maximum displacement), shouldn't the nodes be exactly 25% from either end of the rod? Why is this not the case? What am I missing? I am asking because I want to build wind chimes and need to find the right spot to suspend the tubes. [link] [comments]  |
| Why is a grossly over expanded nozzle more efficient than a slight over expansion? Posted: 12 Jun 2017 07:38 AM PDT So I came across this when I was doing some gas dynamics research, and I am trying to remember back to my high speed aerodynamics class. A grossly overexpanded nozzle moves the oblique shocks at the exit into a normal shock that slowly moves into the nozzle, while a slight overexpansion has oblique shocks outside the nozzle. Is a grossly overexpanded more efficient because once that normal shock is within the nozzle, all flow pressure increases within the nozzle itself despite it separating from the nozzle wall? With a lot of shock patterns it seems like there is a normal shock some distance from the exterior of the nozzle, followed by a shock diamond pattern of obliques and expansion waves, but I would have thought that getting as close to ideal full expansion would reduce change in entropy and provide maximum thrust. I came across this claim that grossly over expanded was more efficient than slight over expansion (while not as efficient as ideal expansion) so I would just like some clarification on this. [link] [comments]  |
| What did the invention of computing do for Mathematics? Posted: 13 Jun 2017 12:52 AM PDT I was recently watching a numberphile video about Fermats last theorom and Ken Ribbet mentions about writing on the first Mac he got. That prompted me to wonder what did the invention of computing do for mathematicians when they became more readily available? Did it really only help in the speed of the calculations therefore increasing the speed at which you could solve a particular problem or did it revolutionise it or simply didn't change alot? I know now that computing can be used to compute simulations and such. Thanks a lot for any answers. I'm not a mathematician in anyway shape or form. [link] [comments]  |
| Posted: 12 Jun 2017 10:03 AM PDT If you allow subtraction on the natural numbers, then you have gaps that are filled by the rest of the integers. If you allow division on the integers, you have gaps that are filled by the rest of the rationals. If you allow roots, you have gaps that are filled with the rest of the reals and then the complex numbers. Yet from what I understand, there's no such gaps in the complex numbers. Why wouldn't the inverse of tetration continue this pattern? [link] [comments]  |
| Why does a liquid run down the side of a glass when pouring it? Posted: 12 Jun 2017 09:51 AM PDT When I pour a liquid from a mug into another container, it runs down the side of the mug. Why does this happen? [link] [comments]  |
| Why is it cold in space but temperatures differ on planets? Posted: 13 Jun 2017 04:02 AM PDT |
| Posted: 12 Jun 2017 11:10 PM PDT Because heat is caused by things moving fast. Nothing can travel faster than the speed of light. Therefore, the hottest a thing can get is if the molecules are traveling at the speed of light, right? [link] [comments]  |
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