Why are reflections (especially in liquid) clearer when viewed at an angle, as opposed to straight-on? |
- Why are reflections (especially in liquid) clearer when viewed at an angle, as opposed to straight-on?
- Just like in supersonic motion, the object that creates the sound can move faster than the waves it produces, is it possible for the E-field or B-field that make up light to move faster than the light?
- What's the implication of the mass of a proton?
- Two Drones Flying Away From Each Other Along the Equator; Does the Earth's Rotation Affect the Length of Ground Covered By Each Drone?
- Is it pure coincidence that the rotation rates of Mars and Earth are both 24 hours (-4 & +39 min)?
- is there a theoretical limit on the magnification provided by telescopes?
- Why is it easier to cook/warm certain foods in the microwave?
- Can extreme tidal forces have an effect on the half life of an atom?
- How would you calculate the the probability of winning the Monty Hall if you switched and there were 'n' amount of doors?
- How big is the universe?
- Is there a theoretical limit to the field strength of an ideal permanent magnet at room temperature? If so, how would we calculate it?
- How do dielectric boots work?
- When inflating a balloon using your lungs, are you effectively filling it with Carbon Dioxide and will this affect it in comparison to inflating it via a compressor?
- Is there an upper bound to how long an electromagnetic wave can be?
- If light is a result of changing electric and magnetic field, can I create visible light by using just an A.C source and a wire?
- Why do some antibiotics make it so one cannot go into the sun?
- How do non-contact voltage detectors work without any current running through the wire?
- How can strong gravitational lensing create multiple images, especially four images?
- Simplest proof that |R^2| = |R|?
- What is the shape of space?
- What makes a beach?
| Posted: 21 Jul 2017 11:36 AM PDT |
| Posted: 21 Jul 2017 07:47 AM PDT |
| What's the implication of the mass of a proton? Posted: 21 Jul 2017 05:56 AM PDT According to a recent paper in Physical Review Letters the proton may weight less than we thought. What are some implications of this difference in how we understand the universe? [link] [comments]  |
| Posted: 21 Jul 2017 06:11 PM PDT Sorry if this has been asked before, it's difficult to come up with an appropriate search term. If two identical drones, hovering a foot off the ground, are placed back-to-back on the earth's equator (parallel with it), and each is then propelled forward along the equator (i.e. directly away from each other) at a fixed speed, would one travel "further" than the other given the direction the earth is rotating? By "further" I mean relative to the surface of the earth, as opposed to a direct ass-to-ass measurement of the drones from their starting point to the end point, which would obviously be the same for each drone. To keep it simple, let's assume there are no other factors involved (such as variable wind resistance, sunlight/time zones, anti-drone activists with shotguns, that the equator of the earth isn't a perfectly smooth surface, etc.) This feels like a physics 101 question, but I was educated in science by a rotation of substitute teachers whose actual area of expertise was P.E. or Home Economics, so I'm learning all of this stuff by the seat of my vast adult pants. Thanks for reading/answering/directing me to previous threads which cover the same question! [link] [comments]  |
| Is it pure coincidence that the rotation rates of Mars and Earth are both 24 hours (-4 & +39 min)? Posted: 21 Jul 2017 09:07 AM PDT And maybe this isn't the same question, but: Is there such a thing as non-coincidental rotational resonance between bodies not orbiting each other? [link] [comments]  |
| is there a theoretical limit on the magnification provided by telescopes? Posted: 21 Jul 2017 06:27 PM PDT Or, does light have a 'resolution limit' as we try to look at smaller and smaller objects from greater and greater distances? Suppose we had an absolutely colossal telescope, that magically scaled up to whatever size was necessary to get a good view of the target, whether that was a radius of 1 million miles, 10,000 AU, 5 billion light years, whatever. My first assumption would be that there would be some sort of issue due to the travel time of light when we think on these scales. Ignoring that, is there some point at which no level of magnification could ever be enough due to the constraints of light itself? If I pointed my magical telescope at the distant galaxy GN-z11 which, according to wikipedia, is 32 billion light years away, is there a level of magnification at which we could observe a single star of that galaxy, or would that be physically impossible due to, say, a lack of photons coming from that source to the telescope? Is there a hard limit to the transmission of light that bars us from, given this potentially infinitely-sized telescope, seeing specific objects on certain planets at a given distance? Is there any reason aside from limits of construction and resources that keeps us from being able to see a single rock on a planet 80 million light years away? A single cell? A molecule? [link] [comments]  |
| Why is it easier to cook/warm certain foods in the microwave? Posted: 22 Jul 2017 04:03 AM PDT |
| Can extreme tidal forces have an effect on the half life of an atom? Posted: 22 Jul 2017 07:40 AM PDT So one of first thing people hear when they are told about black holes, is that they have the power to even rip apart atoms due to extreme tidal forces produced by the gravity. Well I was thinking is this somehow a linear capability. Say we have an Uranium atom orbiting an Earth mass black hole 2cm above the event horizon. Ignoring time diliation, would the Uranium be more likely to give up a helium nucleus (alpha decay) due to the nucleus being pulled apart by the black holes tidal force? Could such a scenario even make an otherwise stable isotope unstable? A Roche limit of sorts, but instead of breaking apart objects held together by gravity, orbiting closer than this limit breaks apart objects held together by the strong force. [link] [comments]  |
| Posted: 22 Jul 2017 07:29 AM PDT I've seen explanations of the Monty Hall problem, and they make sense, and I was wondering how you would go about calculating the probability of winning if you
[link] [comments]  |
| Posted: 21 Jul 2017 05:46 PM PDT If the universe was created 13.772 billion years ago from a singular point, then why wouldn't the observable universe be exactly 27.554 light years in diameter? [link] [comments]  |
| Posted: 21 Jul 2017 05:57 PM PDT I've been reading about new powerful iron nitride and manganese-bismuth magnets that are under development, and began to wonder whether there's an upper limit to the strength of a permanent magnet at room temperature and if so how we'd calculate it. I searched around and found some threads on this topic (like this one on Quora) but no one seemed to attempt to answer the question of what that limit would be. Some people suggest that an upper limit could be determined by identifying atoms with the highest magnetic dipole moment and find out what the magnetic moment/field strength would be if all of the particles composing it were spinning in the same direction and multiply that by the number of atoms in a solid, but that approach seems to completely omit the fact that the same atoms in different crystal structures produce significantly different macroscopic magnetic effects (like magnetite vs austenite). Does anyone know if a good answer exists for this question or it's incalculable for some reason? [link] [comments]  |
| Posted: 21 Jul 2017 06:09 PM PDT |
| Posted: 21 Jul 2017 03:09 PM PDT |
| Is there an upper bound to how long an electromagnetic wave can be? Posted: 22 Jul 2017 12:41 AM PDT |
| Posted: 22 Jul 2017 12:21 AM PDT By varying the direction of current I can set up a changing electric field which will in turn will create a changing magnetic field and hence should produce EM waves, right? [link] [comments]  |
| Why do some antibiotics make it so one cannot go into the sun? Posted: 21 Jul 2017 11:07 AM PDT |
| How do non-contact voltage detectors work without any current running through the wire? Posted: 21 Jul 2017 11:33 PM PDT I was using my non contact voltage detector and it seemed to be working even without any current running through the wire, I googled to confirm and I was correct, so how does this work? [link] [comments]  |
| How can strong gravitational lensing create multiple images, especially four images? Posted: 21 Jul 2017 11:08 PM PDT I've read several articles including wikipedia about strong gravitational lensing. They all explain in detail with animations how Einstein rings can appear, and then go on to mention the possibility of multiple clean images as a matter of fact, no explanation given. The animation on wikipedia somewhat pictures how double images appear before and after the Einsteing Ring due to a transition - but how can four rather crispy images appear? [link] [comments]  |
| Simplest proof that |R^2| = |R|? Posted: 21 Jul 2017 11:34 AM PDT Just watched this video on Hilbert space-filling curves. I realized that the existence of a bijection from R to R2 like the Hilbert curves in the video is effectively a proof that the cardinality of R and R2 are the same, but what is the simplest proof? Is it a matter of finding the simplest space-filling curve? [link] [comments]  |
| Posted: 21 Jul 2017 06:39 AM PDT Does space have a geometrical form? And if so what form? Flat? Hyberbolic? Squared? [link] [comments]  |
| Posted: 21 Jul 2017 05:09 AM PDT I'm currently on holiday in Sydney (marvellous city. Shame about the 24 hour commute to get here) and around Sydney harbour are many, many beaches; some big (Bondi), some small (the 3' wide example near Jeffrey St. Wharf). Through my incredibly limited knowledge of geology, I'd assume it would be something to do with erosion of the sandstone, and something to do with tides in deciding (for lack of a better word) where beaches form, but Bondi is in a cove, so why has only some of that cove turned to beach and the rest remained as a sandstone cliff? Basically, what forces act on one area of coastline to form a beach, and not others? [link] [comments]  |
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