"A ring of rope is wrapped around the Earth. With only 6.3 additional meters of slack, the rope would hover 1 meter off the ground." Does this surprising fact have a three dimensional equivalent? |
- "A ring of rope is wrapped around the Earth. With only 6.3 additional meters of slack, the rope would hover 1 meter off the ground." Does this surprising fact have a three dimensional equivalent?
- why does Bismuth crystallize into such a weird square shape?
- How did someone find out that the speed of light is approximately 300,000 km/s?
- Has the human brain changed in the past 100,000 years? If so, what has changed? Are there any differences between population groups? If not, why?
- How does this two minute "Newton Gravity Timer" work? [Links in comments]
- If an object accelerated fast enough, would it eventually start colliding with the Cosmic Microwave Background (pair production), effectively making the maximum speed limit lower than the speed of light?
- Can photons only be emitted by electrons?
- What is the relation between String Theory and the Simulation Hypothesis?
- Is carbonation of a beverage itself unhealthy?
- How much of the human genome have we identified and understand?
- In a MRI, why do hydrogen atoms relax back into their original spin direction when the magnetic field is removed?
- Could the extreme temperatures and pressures seen in collapsing bubbles during cavitation possibly be used for nuclear fusion?
- Why is it important to "prove" mathematical conjectures/hypotheses?
- Are biosynthesis pathways forced to evolve "forward", with each intermediate reaction-step reaching fixation as its own useful trait?
- On clear and sunny days, can the tint of the sky vary? Can the color be different depending on the day?
- Why do the back of refrigerators feel warm?
- How would NASA detect life on Mars?
- How exactly can sperm reach the egg?
- If all solids have a vapour pressure, does that mean that the Voyager probes are evaporating?
- At it's most basic form, isn't a curved line just a series of rather random, short, straight lines?
- What happens to the body while bleeding until death?
- How far from Earth could HD video be sent?
| Posted: 15 Aug 2016 09:40 PM PDT Consider my three dimensional equivalent to this surprising fact: A sphere of fabric shrouds the earth. How many additional square meters of fabric would allow the fabric to hover 1 meter above the ground? I suspect the answer will not be as surprising as the two-dimensional situation...Are the two situations even "intrinsically/mathematically" related? [link] [comments]  |
| why does Bismuth crystallize into such a weird square shape? Posted: 15 Aug 2016 09:52 AM PDT it doesnt make sense for bismuth to look like this when most crystalline metals are much less orderly structured. [link] [comments]  |
| How did someone find out that the speed of light is approximately 300,000 km/s? Posted: 16 Aug 2016 02:26 AM PDT A VERY amateur scientist here (hence the question, please pardon me). I know it is an approximation, but nonetheless very accurate. Did scientists measure the speed in a darkroom where light was entered or something like that? While we're on the topic of proving things, could someone also please tell me how the first accurate boiling/melting points of materials were determined. I know that the purity of a material is used by comparing the melting point to that of the same material but 100% pure. But how does one know that the pure material's melting point is completely accurate (especially at higher temperatures)? For example, how do we know that the melting point of gold is precisely 1,064°C? Many thanks. [link] [comments]  |
| Posted: 15 Aug 2016 07:24 AM PDT So much has changed between different human population groups in this time period, such as hair, eye color, average height, skin color, and so on, but in regards to the human brain I've yet to read anything about it in standard literature. [link] [comments]  |
| How does this two minute "Newton Gravity Timer" work? [Links in comments] Posted: 16 Aug 2016 05:32 AM PDT |
| Posted: 15 Aug 2016 03:08 PM PDT |
| Can photons only be emitted by electrons? Posted: 15 Aug 2016 12:37 PM PDT If so would other elementary particles be able to emit their "own type of photons" to exchange energy? [link] [comments]  |
| What is the relation between String Theory and the Simulation Hypothesis? Posted: 16 Aug 2016 06:30 AM PDT |
| Is carbonation of a beverage itself unhealthy? Posted: 15 Aug 2016 09:13 AM PDT Dietary guidelines recommend avoiding soda because of the added sugar or even the artificial sweeteners. But when looking at seltzer versus plain (noncarbonated) water, is there any negative health effect associated with the carbonation? Or does a beverage only become unhealthy when adding additional ingredients after being carbonated? [link] [comments]  |
| How much of the human genome have we identified and understand? Posted: 15 Aug 2016 10:21 AM PDT By "identify and understand" I mean we can find a specific portion of a DNA sequence and say "this is the instruction for growing fingernails". [link] [comments]  |
| Posted: 16 Aug 2016 07:07 AM PDT Why wouldn't they just stay in their new alignments? A proton absorbs energy and increases its rotations per second the higher the EM field strength in Tesla units. So I get that it's shedding energy once you remove to field and it goes back to its original rotations per second. Two questions though: Why is it in rotations per second? I thought spin was 1/2 integer or integer numbers? Why does the proton return to the direction it was pointing before the field was applied? If the original direction can be random, what causes it to be random and fundamental to that particle? Like, why do all the spins line up in a magnet and stay pointing that way? If you whack some iron enough they tend to all line up. What's causing this? [link] [comments]  |
| Posted: 15 Aug 2016 06:25 PM PDT This paper mentions how bubble collapse during cavitation could possibly be used for nuclear fusion if the model that predicted interior shock waves is correct. I'm having a hard time finding information on whether that idea has been proven or disproven yet. If the predicted 10 Mbar pressures and 10 million Kelvin temperatures can indeed happen, would it be possible to use cavitation for the fusion of, say deuterium-tritium? [link] [comments]  |
| Why is it important to "prove" mathematical conjectures/hypotheses? Posted: 15 Aug 2016 09:07 AM PDT For example, the Rieman hypothesis. What is the benefit to proving it over simply assuming it is true/false and seeing what the consequences of that are? After all, mathematics rests upon any number of axioms and posulates that are accepted as true, and new branches of math can arise from flipping that around (e.g. discarding the parallel postulate). Obviously, there may be novel math involved in solving these theorems, so this question is about the value inherent in the solution existing, independent of the how it was discovered. [link] [comments]  |
| Posted: 15 Aug 2016 12:34 PM PDT Example: the function of adrenaline on its receptor (activating the sympathetic nervous system) seems more "basic"—like it would be a beneficial adaptation to relatively simpler, "lower" organisms—than the effect of dopamine or noradrenaline. But you have to go "through" both of those to get to adrenaline. It's easy to imagine the whole catecholamine biosynthesis pathway as having evolved "for the sake of" just producing adrenaline, with the intermediates at first being useless, and then later some of the intermediates getting their own receptors when it turned out their production and non-consumption correlated with useful environmental cues. As far as I understand evolution, though, it seems like there should have been one ancestor species that evolved the reaction to convert phenylalanine into tyrosine, and stopped there, because it had a use for tyrosine directly and that trait reached fixation; and then another later species that evolved a reaction to convert the tyrosine into L-DOPA, and had a use for just that; and so on. [link] [comments]  |
| Posted: 15 Aug 2016 12:18 PM PDT |
| Why do the back of refrigerators feel warm? Posted: 16 Aug 2016 05:19 AM PDT A few months ago I was cleaning the kitchen and decided to finally clean the stuff under the fridge. I moved it to the side and I noticed that the back of the fridge was noticeably warmer than usual temperatures. I figured the proximity of the fridge to the back wall caused the temperature to slightly go up, so I thought nothing of it and continued cleaning. However earlier today I went to eat at a restaurant and they had a Soda machine refrigerator. A part of it was sticking out at the side. There was a table behind it that I sat at. Out of curiosity I felt and noticed that it was also warmer than usual. I was just curious if this was true for all refrigerators or if something else was going on since I thought refrigerators were supposed to be cold. [link] [comments]  |
| How would NASA detect life on Mars? Posted: 15 Aug 2016 03:15 PM PDT Do the rovers have any equipment capable of detecting life on the microbe level, or would the sample need to be transported back to earth for testing? [link] [comments]  |
| How exactly can sperm reach the egg? Posted: 15 Aug 2016 11:30 AM PDT I know how conception work. What I don't know is, how the sperm can "crawl" the several centimetres from cervical opening up to the fallopian tube. I understand that the sperm cells are mobile. But I'm interested in the mechanical aspect of their journey. I don't think it's possible for the seminal fluid to reach up to the fallopian tubes, so the sperm cannot swim through that. And they aren't airborne as well so they cannot just "fly" through the uterus. So are they crawling on the inner surface of the uterus? [link] [comments]  |
| If all solids have a vapour pressure, does that mean that the Voyager probes are evaporating? Posted: 15 Aug 2016 07:12 PM PDT |
| At it's most basic form, isn't a curved line just a series of rather random, short, straight lines? Posted: 15 Aug 2016 10:29 PM PDT With more of the straight lines pointing horizontally or vertically, to form the curve? [link] [comments]  |
| What happens to the body while bleeding until death? Posted: 15 Aug 2016 01:11 PM PDT |
| How far from Earth could HD video be sent? Posted: 15 Aug 2016 02:49 PM PDT Let's say I'm on a generational space mission, destined to exit the solar system and travel outward for the rest of my (and my descendant's) life. Let's further stipulate that I am a Tennessee Vols fan, and I would like to watch their football games while traveling in space. How far away from Earth would I have to be for the HD signal to cut out, given super powerful transmission technology and the will to help my dreams come true (on my end, and that of NASA)? [link] [comments]  |
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