What were the oceanic winds and currents like when the earth's continents were Pangea? |
- What were the oceanic winds and currents like when the earth's continents were Pangea?
- How come a room doesn't get brighter the longer you shine a light in it?
- Why is it easy to balance on a bike while moving, but hard while it isn't moving?
- Does practicing throwing a ball accurately with your right hand increase your accuracy with your left hand and vice-versa?
- What do old insects die of?
- Why is stable matter only composed of protons, neutrons, and electrons? Why aren't there other stable combinations of elementary particles?
- I'm aware that the earth is not a "sphere", but, rather, a heptoloidal zircosumfered something or another, however, the Sun sure seems to be very nearly spherical to me. Is it or is it not, and why, in either case?
- When the super ocean Panthalassa existed, was there islands or archipelagos in the way we have them now?
- Why do earthquakes have epicenters instead of an earthquake line along the plates that shift?
- Why is fibreglass used at all in composite aircraft instead of being completely carbon fibre such as in the Boeing 787 ?
- Is it possible to heat an object through light such that it ends up being hotter than the source using only black body radiation?
- What causes ice cream to melt slower than gelato?
- Why can't refrigeration create energy?
- How easy is it for electricity to arc in a vacuum?
- Did earthquakes have a higher or lower magnitude when the continents formed Pangea?
- What prevents certain drugs from permeating the blood brain barrier?
- How does antimatter interact with matter?
- What's the spatial structure of a single photon? Does it have a spatial amplitude?
- If a & b are irrational must a+b be irrational?
- How do FM radios detect radio stations based on frequency if the whole concept of FM is to alter the frequency?
- I live near the polar circle and I travel at a lower speed along with the Earth compared to my imaginary friend who lives on the Equator. Does the effects of this difference in speed on our bodies impact our lifespan or our physiology over our lifetimes?
- How can WIMP detectors exist if WIMP's are hypothetical particles?
| What were the oceanic winds and currents like when the earth's continents were Pangea? Posted: 06 Jul 2017 08:49 PM PDT |
| How come a room doesn't get brighter the longer you shine a light in it? Posted: 06 Jul 2017 09:32 PM PDT If I turn on a lamp or a flashlight or something in an enclosed space, the photons fill the room. But if I keep the light on, then it keeps emitting photons, so why doesn't the room just keep getting brighter? Does it have to do with how fast photons decay? [link] [comments]  |
| Why is it easy to balance on a bike while moving, but hard while it isn't moving? Posted: 06 Jul 2017 07:21 PM PDT |
| Posted: 07 Jul 2017 02:50 AM PDT |
| Posted: 06 Jul 2017 01:57 PM PDT If humans who die of old age generally die of heart failure or cancer, what do old insects die of? I know the mayfly is supposed to live for a day, and that some spiders can live for years- but what actually kills them? [link] [comments]  |
| Posted: 06 Jul 2017 11:26 PM PDT |
| Posted: 06 Jul 2017 08:19 PM PDT |
| Posted: 07 Jul 2017 03:48 AM PDT |
| Why do earthquakes have epicenters instead of an earthquake line along the plates that shift? Posted: 06 Jul 2017 10:45 PM PDT |
| Posted: 07 Jul 2017 07:21 AM PDT Carbon fibre is superior right? Are there any advantages or is it due to cost or construction difficulties? Here is a link to the materials used in the 787 http://technicallyspeaking.brachiolopemedia.com/wp-content/uploads/2013/08/CompositeMaterialsIn787.jpg [link] [comments]  |
| Posted: 07 Jul 2017 03:32 AM PDT I think this question (in various forms) has been asked to death but I've yet found any satisfying answers. XKCD has a piece on a similar question which resulted in a bunch of debate (for example here, here ). But I'd like to concentrate on the main question stated in the title of this post since I think this is already hard enough to answer without being distracted by things like ignition points, practical losses by absorption of light in the atmosphere or trying to fit a mirror around the sun. I have 2 situations in particular: Say a photon is emitted of a (relatively) cold object. This photon then collides with a hot object. Why wouldn't this photon be absorbed by the hot object (and making it hotter)? The 2nd law of thermodynamics is often mentioned. Heat cannot flow from a cold object to a hot object. But is this still applicable if you are using light for the energy transfer? How would an emitted photon know how hot it's source was and why/how would it be prevented being absorbed by a hotter object? A photon is a photon right? The second situation: You could also think about the following (theoretical) set-up: 2 perfectly absorbing and irradiating black bodies placed at the focal points of an ellipsoid perfect mirror. Both bodies will be at an equilibrium when left alone long enough. The equilibrium could be described by the Stefan-Boltzman Law. Which would result in the following formula: And if the surface areas (A₁ and A₂) are not equal then the result would be that the temperatures (T₁ and T₂) are also not equal. My gut feeling says "of course this is not possible" but I cannot poke a hole through these two situations I've just described. I'd love to hear your theories on this. [link] [comments]  |
| What causes ice cream to melt slower than gelato? Posted: 06 Jul 2017 10:03 PM PDT |
| Why can't refrigeration create energy? Posted: 06 Jul 2017 09:03 PM PDT If heat is energy, and cold is the lack of heat, and refrigerators/freezers remove heat from food- why are they not self sustaining or using the heat they remove to create more energy/power [link] [comments]  |
| How easy is it for electricity to arc in a vacuum? Posted: 06 Jul 2017 02:20 PM PDT I'm doing a project that's going to involve running a bunch of electronics in a near vacuum. Unfortunately I have basically zero experience working in a vacuum. I've done my best to account for a lot of the factors that could affect the circuit based on what I've been reading, but my big concern is that I need a kill switch that will physically disconnect power from the circuit controlling a set of 12V motors while it's being pressed. I've found a number of normally closed buttons that would work under regular conditions, but my concern is that the voltage can just arc across the leads in the switch even if it's opened once it's in the vacuum. Realistically, is this something I will likely need to worry about, or is there an equation that can give me an idea of whether or not arcing is likely? If you need more info. The switch is going to be connecting a 12V battery to a circuit, and the physical action that's going to press the switch is at most an inch. I'll have electronic measures as a backup, but ideally I would like to be able to physically cut the power. [link] [comments]  |
| Did earthquakes have a higher or lower magnitude when the continents formed Pangea? Posted: 07 Jul 2017 03:48 AM PDT |
| What prevents certain drugs from permeating the blood brain barrier? Posted: 06 Jul 2017 08:02 AM PDT I hear about drugs not being able to reach the brain because they're filtered out by the blood brain barrier. What's going on to prevent this in certain drugs? Is it the size of the chemical or how it binds with proteins in the blood? [link] [comments]  |
| How does antimatter interact with matter? Posted: 06 Jul 2017 08:47 PM PDT Since nothing actually touches each other and is just repelled by elctromagnetic forces unless they under go fussion how does antimatter interact to explode? Does it happen by the electromagnetism, it needs to fuse with matter or some other process? [link] [comments]  |
| What's the spatial structure of a single photon? Does it have a spatial amplitude? Posted: 06 Jul 2017 11:57 AM PDT So, like any particle field, photons have a complex amplitude, which in one dimension oscillates in size. Does a photon in three dimensions also have a spatial amplitude? Does it actually move up and down (or side to side), or is the oscillation of a photon purely in its wave function along a straight line? [link] [comments]  |
| If a & b are irrational must a+b be irrational? Posted: 06 Jul 2017 09:46 AM PDT Yesterday I stumbled across a dumb little "Only 10% of people get this right!" problem on Facebook: √x + √(x+15) = 15 My solution was simple: I assumed that x and (x+15) were both perfect squares, and given that the distance between the nth and nth+1 perfect square is always 2n+1, it was immediately obvious that n=7 and x was 49. No big deal, not a hard problem. However, it occurred to me my solution involved a weird postulate. That √x and √(x+15) must be perfect squares. As if there's no imperfect squares (if there is such a thing) the irrational roots of which could sum to the rational number 15. So here's my question: Is it possible for 2 irrational numbers to sum to a rational number? And let's disqualify the obvious degenerate case where the irrational parts of the number cancel out, like if:
Yeah, obviously their sum is rational. But what I'm really asking is you could sum just the irrational bits, much like we do with imaginary numbers, if it's possible to make a rational number. My intuition says no, it's not possible. Is there a proof? [link] [comments]  |
| Posted: 06 Jul 2017 09:43 AM PDT I started learning RF theory and I'm hung up on this concept of Frequency Modulation. I think theres a hole in my fundamental understanding. If my radio locks onto say, 98.1, its listening for signals operating at 98.1 MHz. So if to create music or whatever else on the channel you have to modulate the frequency, doesnt that make it no longer 98.1? I know I'm wrong since FM radios function, I ust wanna know how [link] [comments]  |
| Posted: 06 Jul 2017 09:08 AM PDT |
| How can WIMP detectors exist if WIMP's are hypothetical particles? Posted: 06 Jul 2017 10:59 AM PDT Weakly Interacting Massive Particles aren't even clearly defined, so designing an apparatus to detect them sounds impossible. [link] [comments]  |
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