- With advances in many fields of Medicine including the transplant of synthetic hearts and 3d printing of various body parts making cheap prosthetics possible, why haven't we seen significant advances in prosthetic cartilage for damaged joints and herniated disks?
- A 1.5 gram serving of salt has 560mg of sodium, what's in the other gram?
- What are we missing before we finally have a quantum theory of gravity?
- Do small people/children have the same amount of sensory neurons as larger people, and if so, does this make them more sensitive to touch?
- Of a 20-floored building, which floor would encounter the most danger assuming that an earthquake takes place and does not collapse the building, and why?
- What's the perfect throwing weight for a spherical object?
- How do I explain/apply equations to the oscillation of a metal needle due to an electromagnet? (Images in description)
- What causes a specific note to be produced when feedback is looped through an amplifier back to the pickup?
- What causes that colorful swirling effect when milk, food coloring and soap are combined?
- Is there a limit to the size of a black hole?
- How do you calculate load distribution on an uneven beam?
- How do fields exert force over distance?
- Why do the bottom edges of sunsets become round as if it became a flat tire and no longer a full circle?
- Why is glare/reflections polarized?
- Why does every video game seem to have a problem when you're swimming if you put your view in a sweet spot before submerged and above water, you can see clearly through the water?
- Do sleepwalkers still get rest while sleepwalking?
- Twin Paradox - Is the travelling twin younger?
- How do we measure the age of ice?
- Physiologically, how do you "lose" weight - do you respire or pee it off?
- Will a suction cup work in space?
- Why does a 2 degree temperature change have such dramatic effects on weather (such as superstorms, massive tornadoes, floods ect)?
- In Genetics, is there an actual distinction between distant, but linked loci, and unlinked loci?
- What is the renormalization group?
- What is the physical quantity of the gravitational constant?
| Posted: 28 Dec 2015 08:49 AM PST Both my sister and mother are suffering from bad cases of hernia and knee pain. Something like cartilage seems like a simple enough structure to manufacture when we're printing heart valves and other much more complicated structures. And yet, I've been reading and talking with non-experts involved in fitness science that we just haven't found the right material, with the right type of properties to replace real cartilage. Doctors/medical researchers, what are the major hurdles faced by prosthetic cartilage today? Edit: please keep this as ELI5 as possible, I don't have a very scientific background. Edit2: Researchers : where is the research at now? What sort of time-frame are we looking at for general use of prosthetics, if you can provide one? [link] [278 comments]  |
| A 1.5 gram serving of salt has 560mg of sodium, what's in the other gram? Posted: 28 Dec 2015 09:37 AM PST |
| What are we missing before we finally have a quantum theory of gravity? Posted: 28 Dec 2015 11:04 AM PST I know the motivations behind string theory and other models of quantum gravity (e.g. unification of fundamental forces) but what I don't understand is what is missing from the current proposed models. Do we have all the details worked out and we're just waiting for experimental verification? Are there still theoretical issues that these models cannot address? I remember reading part of Quantum fields in curved spacetime by Birrell & Davies and in the introduction they discussed issues with renormalization of infinities in the ground state energy of the quantum harmonic oscillator and how certain tricks to skirt that issue don't work with gravity. Is that still a problem? [link] [22 comments]  |
| Posted: 28 Dec 2015 07:48 AM PST |
| Posted: 28 Dec 2015 07:50 AM PST |
| What's the perfect throwing weight for a spherical object? Posted: 28 Dec 2015 10:38 AM PST Is there a specific weight that's most advantageous for throwing objects? Like, if it's too light, it doesn't get very far, and of course if it's too heavy, it can't be lifted in the first place. For the average person, what's the best weight for, say, a spherical object, a basic ball, to be so it can be thrown the farthest? [Physics] [link] [20 comments]  |
| Posted: 29 Dec 2015 07:00 AM PST I recently did some experiments with an electromagnet and a magnetic(?)(it is affected by magnets) needle, like so (images) The experiment was simple: I put a metal rod through a spool(coil?) creating an electromagnet and sat a rotating needle next to it. I made sure the rod was un-magnetic(?) before starting the experiment by switching between multiple and then turned the magnet on. I used different voltages to create different strengths of magnetism and filmed the system. I will be using tracker to graph the needle (in progress). I realise now that I (maybe) should not have measured the strength in voltage, but it does give you some indication of the strength I believe. My aim was to find the relationship between the strength of the electromagnet and the frequency of the oscillation of the needle, but I haven't been able to find out what equations to consider, as they are not in my syllabus. I know gravitational equations on the forces between two masses and that the strength of the force depends on the mass of the objects and the distance squared. I'm guessing magnetic forces are somewhat the same only relating perhaps to the charge(?) of the objects but also the distance. I also know equations related to simple harmonic motion and oscillations which I'm guessing is also involved somehow as the needle kinda resembles a classic pendulum, only the force is a magnet. How would I go about this? How do I apply physics to the oscillations? I could post more pictures or even a video if that helps, but I think you get the general idea from the pictures I posted. [link] [comment]  |
| Posted: 28 Dec 2015 11:35 AM PST Hey guys, I was playing my guitar today and I noticed when you crank the amplifier gain and have your volume at a reasonable setting, you generate a feedback loop. This isn't new but what I noticed was the note it produced, it was inline with the harmonic points of the string, and not the note of the open string itself. My previous physics knowledge taught me that a harmonic is a temporary node on the string, similar to a fret except that it isn't a physical node. When a harmonic is struck, the entire string has energy producing the wavelength but it is completely stationary at the node point. These nodes are perfect divisors of the entire length of the string, causing the frequency to multiply linearly (1st harmonic is the open string, 2nd harmonic is the string divided in half, 3rd is the quartered string and so on). What causes the string to produce a note that coincides with the harmonic points on the string, but without any nodes? As a footnote, if you have a guitar play the E harmonic on the A string (7th fret), it's an E5 apposed to the A3 you play with the open string. That E5 is the note my amplifier feeds back to my pickup, except there's no human interaction creating the note. And it isn't a harmonic played by the string. [link] [12 comments]  |
| What causes that colorful swirling effect when milk, food coloring and soap are combined? Posted: 29 Dec 2015 05:07 AM PST It looks like there is a lot going on once soap is added to the mixture. I am imagining an all-out war being fought on molecular scale. Is the milk only there to prolong the chaos by keeping the food coloring and soap from dissipating too fast or does it serve as a catalyst somehow? What exactly is happening here? [link] [2 comments]  |
| Is there a limit to the size of a black hole? Posted: 29 Dec 2015 04:56 AM PST If there is, what is it and why it exists? I specifically mean the upper limit, edited to add. [link] [1 comment]  |
| How do you calculate load distribution on an uneven beam? Posted: 28 Dec 2015 11:30 AM PST If a beam is supported at either end, but one end is higher, is it correct that the lower end will bear more weight? How would the load difference at the two points be calculated? [link] [13 comments]  |
| How do fields exert force over distance? Posted: 28 Dec 2015 10:16 AM PST For example, how does one charge exert force on another without being in physical contact [link] [16 comments]  |
| Posted: 28 Dec 2015 07:49 AM PST |
| Why is glare/reflections polarized? Posted: 28 Dec 2015 03:46 PM PST |
| Posted: 28 Dec 2015 01:36 PM PST I hope I explained it well. I'm a very big gamer, and I've noticed time and time again, across tons of games, that there always seems to be this sweet spot with games that allow you to go underwater where, if you are just barely-not-even submerged, the game allows you to see as clearly through water as it does the sky. Is this a common programming issue or just a product of a time-tested water system? [link] [5 comments]  |
| Do sleepwalkers still get rest while sleepwalking? Posted: 28 Dec 2015 03:21 PM PST Will a sleepwalker wake up just as well rested as a person who does not sleepwalk. [link] [4 comments]  |
| Twin Paradox - Is the travelling twin younger? Posted: 28 Dec 2015 10:11 AM PST Discussing with a friend whether the twin paradox is valid or not under Einstein's relativity theory. Le me posit it as we are discussing. Assume one twin stays on Earth. The other one travels to Alpha Centauri and back at 0.8c. Let's assume he needs to accelerate/decelerate as well. When the travelling twin returns to Earth, are they the same age? Or is the travelling twin younger? My understanding of relativity says the later, as apparently does Wikipedia. This link however says otherwise. Can any physicists chime in on whether under the simulated trip as described above there would be a difference in age? [link] [22 comments]  |
| How do we measure the age of ice? Posted: 28 Dec 2015 09:44 AM PST I'm explaining (poorly) how climate change is not only real to my grandfather but explaining in laymen's terms how we can measure it. This led to me pointing out a few receding glaciers and he seems to think that ice just comes and goes. How do we know a glacier is old? E; added is [link] [8 comments]  |
| Physiologically, how do you "lose" weight - do you respire or pee it off? Posted: 28 Dec 2015 04:05 PM PST I have read that you respire it off and urinate off the products of anaerobic respiration. Does it all boil down to getting the body into some state of ketoacidosis? I know that it just doesn't "melt" away. Thanks and please get technical. [link] [4 comments]  |
| Will a suction cup work in space? Posted: 28 Dec 2015 09:40 AM PST I'm sure one would work inside a ship's cabin, but what about on the outside windows? [link] [10 comments]  |
| Posted: 28 Dec 2015 07:11 AM PST This is an X post from r/explainitlikeimfive but unfortunately, nobody there seems to get it either. Why does 2 degrees (C) push us over the tipping point and why is our climate so venerable to a relatively small change, especially when the earths temperature varies ~75 degrees pole to pole? 1) yes 5*1022 joules is a lot but again, compared to the massive amount of energy already present and the even larger amount of energy being received and radiated by the sun, it is almost nothing. 2) there is no inherent reason for the earth to be finely tuned. I am asking why it is. Simply saying it is finely tuned does not help. 3) I am not talking about life. I don't care if life is finely tuned (and I get why it is) I am talking about weather 4) simply stating what will happen (like saying lakes all over will melt) without tying it back to the whole world is not helpful. 5) Please ignore people trying to bring in politics. [link] [33 comments]  |
| In Genetics, is there an actual distinction between distant, but linked loci, and unlinked loci? Posted: 28 Dec 2015 10:54 AM PST My textbook says that distant, but linked, loci will always have a Recombination Fraction of 50cM. This means that they will segregate independently though, so is there any real reason to call them linked? [link] [2 comments]  |
| What is the renormalization group? Posted: 29 Dec 2015 01:41 AM PST |
| What is the physical quantity of the gravitational constant? Posted: 29 Dec 2015 01:39 AM PST G is roughly 6.67x10-11 m3 kg-1 s-2 . So m is length, m/s is speed, m/s2 is acceleration, g is weight but what is m3 kg-1 s-2 or N m2 /kg2 . What does the unit mean and do we use it anywhere else? [link] [1 comment]  |
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