- If an astronaut travel in a spaceship near the speed of light for one year. Because of the speed, the time inside the ship has only been one hour. How much cosmic radiation has the astronaut and the ship been bombarded? Is it one year or one hour?
- Why do humans drink water differently from other animals?
- Would a hydrophobic surface reduce the drag of an aerodynamic object traveling in air at all?
- Why "1 + 1 = 2" ?
- *Where* is the "hologram?"
- How are intermontane basins formed?
- Why is it that the medial branches of the dorsal rami innervate the cutaneous tissue of the upper back, but the lateral branches of the dorsal rami innervate the cutaneous tissue of the lower back?
- When will Alaska touch Russia, and what will happen geologically?
- How do we calculate million/billion plus half lives of elements?
- Why does the iron filings and bar magnets experiment result in the iron filings arranging themselves in neat lines when the magnetic field should be continuously distributed around the magnet?
- How does drinking water clear the bad stuff out of our bodies?
- What happens with fat and muscle tissue when there is no food consumption?
- What does the solubility of a chemical in powder form (Allopurinol) mean when I want to make solution?
- Does non-photonic energy count towards the total mass-energy of a system?
- Why are all ferroelectric materials also piezoelectric?
- I just heard that it would take 4 light-years of lead to stop a neutron. This seems like it leaves out how fast the neutron is moving. How fast or why not?
- Were nuclear weapons a straightforward result of nuclear theory? Or was it more complicated than that?
- What is the line below the nose but above the mouth on mammals called, and what is it for?
- Why can't we control our heart beat, what physically stops us from controlling those types of muscles?
- Why does the integral of 1/x result in a logarithm? Also, why does logarithm have base e?
- Does the intermediate axis theorem have any recapitulation in the switching of the magnetic poles of the Earth?
- Can a child end up with more than 50% of their genes from the father?
- Does an empty refrigerator use less energy than a full refrigerator?
| Posted: 02 Feb 2017 02:00 AM PST |
| Why do humans drink water differently from other animals? Posted: 01 Feb 2017 09:12 PM PST Of course I do not mean when we use cups or straws. What I mean is, imagine you fill your hands with water and raise it to your mouth to drink. How do you drink the water from your hands? I imagine you use your mouth to suck up the water. However when I observe my pets (cat and dog) drinking water from their bowl, they use their tongue to lap the water into their mouths. I'm not sure how other mammals do it as I have not really paid attention. I am curious why mammals would have different ways to drink water. Do other apes drink water in the same way as humans? Is the difference due to mouth/jaw physiology? [link] [comments]  |
| Would a hydrophobic surface reduce the drag of an aerodynamic object traveling in air at all? Posted: 01 Feb 2017 08:41 PM PST It has been shown that a superhydrophobic surface can significantly reduce the drag on an object submersed in water (not really experimentally shown on a large scale due to issues with surfactants I think). See this reference for instance: Extraordinary drag-reducing effect of a superhydrophobic coating on a macroscopic model ship at high speed. By Hongyu Dong I wanted to know if a drag reduction effect can still hold if we made two changes. i) the object was moved to air rather than water and ii) the surface was made to be hydrophobic rather than superhydrophobic. My thinking is that if the object is traveling in air, there will still be a thin film of air pinned to the object, right? And this thin film will then help keep the surrounding flow laminar, or at least more laminar than without the hydrophobic coating. Of course, the drag might not see a significant reduction but I just want to know if it works at all. [link] [comments]  |
| Posted: 31 Jan 2017 10:55 PM PST I'm a high school teacher, I have bright and curious 15-16 years old students. One of them asked me why "1+1=2". I was thinking avout showing the whole class a proof using peano's axioms. Anyone has a better/easier way to prove this to 15-16 years old students? Edit: Wow, thanks everyone for the great answers. I'll read them all when I come home later tonight. [link] [comments]  |
| Posted: 02 Feb 2017 06:58 AM PST Having seen several recent news articles suggesting the first evidence seen regarding the universe as a hologram, along with older information on the theory (a lot from Susskind) I find myself still unclear on the location of information in a holographic universe. Are they positing that it is all on an event horizon of the entire universe and completely non-local, or is it local, but all on a 2D surface at Planck scales? [link] [comments]  |
| How are intermontane basins formed? Posted: 01 Feb 2017 08:24 PM PST I understand that they are located within and in-between mountain ranges, and I've read online that the basins are often formed as a result of grabens. However, I can't figure out how the extensional forces required for graben formation could appear in such a region. [link] [comments]  |
| Posted: 01 Feb 2017 08:25 PM PST |
| When will Alaska touch Russia, and what will happen geologically? Posted: 01 Feb 2017 08:21 PM PST Hello r/askscience, This is my first time asking any questions here, but I was wondering about something that Google searches failed me on, when will Alaska touch Russia. I know that it is approximately 55 miles between the tip of Alaska and Russia, but it brings up the question when will the land mass make contact? Furthermore, what will geologically happen. These areas have been separated from what I have heard since prehistoric times, so will we massive extinction of certain species since animals haven't adapted to Russian wildlife? [link] [comments]  |
| How do we calculate million/billion plus half lives of elements? Posted: 01 Feb 2017 03:37 PM PST |
| Posted: 01 Feb 2017 11:53 PM PST |
| How does drinking water clear the bad stuff out of our bodies? Posted: 01 Feb 2017 08:37 PM PST Does distilled VS stilled water make a difference? How does it help our skin? Just curious how it actually works inside of our bodies. Always heard that drinking water can flush all the bad stuff out. Esp after a greasy, fat meal. [link] [comments]  |
| What happens with fat and muscle tissue when there is no food consumption? Posted: 01 Feb 2017 07:38 PM PST Why is it said that muscle tissue is broke down when you don't eat? Isn't the whole purpose if storing fat to use it when energy is needed? [link] [comments]  |
| Posted: 02 Feb 2017 03:04 AM PST I am looking selleckchem.com at a powder reagent of Allopurinol. I am planning to use it for an experiment. However, the site also shows the solubility in vitro with water at 4 mg/mL (29.38 mM). If I want to make a working concentration of 10 uM (10 umol/L) in a 2 mL aliquot, how do I factor in the solubility of this reagent in water? I apologize in advance, this is all information I should probably understand. This is the link if you want to see what I mean. http://www.selleckchem.com/products/Allopurinol(Zyloprim).html [link] [comments]  |
| Does non-photonic energy count towards the total mass-energy of a system? Posted: 01 Feb 2017 04:58 PM PST If I have a massive system that is just on the edge of collapsing into a black hole and I add mass, it collapses. If I shoot it with a laser, it collapses, because the photons put it over the edge as their gravitation adds to the system. But what if I kick it and start it rotating? Does that rotational energy add to the system's mass-energy and put it over the edge? What if I linearly accelerate it? Or if I reshape it so that it is two shells, and then apply a voltage between the shells, adding energy due to capacitance? If I cooled it down, would I be taking it further from collapsing (assuming no density changes)? If I started to create a cavity at the center of it by pushing outward, thereby increasing the gravitational potential energy of the system (and assuming no change in outer radius), would it collapse? [link] [comments]  |
| Why are all ferroelectric materials also piezoelectric? Posted: 01 Feb 2017 09:04 PM PST I've been reading up on the piezoelectric effect which brought me to the ferroelectric effect and it said that all ferroelectric materials are also piezoelectric but I can't seem to find an explanation for why that is? [link] [comments]  |
| Posted: 01 Feb 2017 02:58 PM PST |
| Posted: 01 Feb 2017 01:07 PM PST Once scientists understood how nuclear reactions occurred, were nuclear weapons an obvious/straightforward application of nuclear theory? (Clearly there are serious practical problems in designing and testing a working mechanism, refining the material, etc, but I'm mostly asking about the initial realization of "hey, I wonder if we could make a really big bomb using this!") Sure, anyone could plug numbers into e=mc2, but that doesn't necessarily imply you could actually use it for something. Or to approach the same question in another way: were nuclear weapons developed independently by multiple countries, after the US demonstrated their potential? Or did they all rely on a common body of work? [link] [comments]  |
| What is the line below the nose but above the mouth on mammals called, and what is it for? Posted: 01 Feb 2017 01:07 PM PST For clarification purposes: http://imgur.com/MuJfwj2 I've been googling around trying to find out what that is caled. It's seen on many mammals and seems to be a defining feature, enough so where the emoticon :3 is identified as a cat. However, unsurprisingly, looking up "what is the line below nose and above mouth called" or any permutation that makes sense yields no relevant results. [link] [comments]  |
| Posted: 01 Feb 2017 04:41 PM PST |
| Why does the integral of 1/x result in a logarithm? Also, why does logarithm have base e? Posted: 01 Feb 2017 09:52 AM PST I think it seems too beautiful and amazing that this is just a coincidence that the integral of 1/x results in a logarithm (much less for that logarithm to have a base of one of the most useful numbers in mathematics, e) for it to just be coincidence. Can someone come up with a proof, or at least a logical argument, for why this is the case? [link] [comments]  |
| Posted: 01 Feb 2017 03:14 PM PST http://i.imgur.com/bXxD8Ek.gifv It just made me think of that. [link] [comments]  |
| Can a child end up with more than 50% of their genes from the father? Posted: 01 Feb 2017 08:02 PM PST So I got into this discussion with my SO after watching Game of Thrones Let's say we have a husband (call him dad) and he has a child with his wife. The child (lets call him child #1 and make her a female) would have 50% of each parents genes. Now if the husband (dad) has sex with child #1 and has child #2, then child #2 would have 50% of the dad's gene and 50% of child #1 genes. But child #1 has already 50% of the dad's gene, would child #2 have 75% of the dads gene? What if this process continues many more times? Would the last child have more of the dads gene then just a half? [link] [comments]  |
| Does an empty refrigerator use less energy than a full refrigerator? Posted: 01 Feb 2017 04:02 PM PST After the contents of the full fridge have cooled, which one is more efficient to keep cool? [link] [comments]  |
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