Is a submarine able to safely contain humans in space? |
- Is a submarine able to safely contain humans in space?
- When light travels through a lot of atmosphere at sunrise or sunset, it's red. When light travels deep into the ocean, it's blue. Why?
- Do spaces with time-like dimensions have spheres?
- How does one hasten copper turning green?
- How do planets "capture" a moon?
- [Physics] Is it correct to say that higher space dimension don't exist, but higher time dimensions do?
- Are there more photons or atoms in the universe?
- why all the functions are multiplied by (e^something) in transformations like laplace and fourier?
- Why do we know that Pi and E are transcendental numbers, but we aren't sure if Pi^pi or e^e are transcendental or algebraic?
- what can the total derivative do that partials cant?
- If my goal is to witness as much sunlight as possible In a 24 hour period on the winter solstice, would I achieve this by going towards the equator or by traveling west?
- Since water expands when it's heated and reduces when cold, can you keep water cold in a bottle by sealing it tight with as little air as possible?
- How do we know that stellar black hole are not neutron star ?
- Are there more neutrinos or photons in the universe?
- Why is snow white? Is it not ice which is invisible?
- What is the theoretical limit to how tall mountains can get on Earth?
- Does the casimir effect become weaker over time?
- Working out when you'd arrive on Earth after leaving Mars going Via Saturn?
- Aren't the statistical methods used in medical research lead to a loss of lots of useful data ?
- Can someone explain why a solution of triodide and starch creates a black color?
- What would happen if a fusion and fission bomb (of equal payloads) were to occur simultaneously, either close to each other or right next to each other?
| Is a submarine able to safely contain humans in space? Posted: 24 Jan 2016 04:34 PM PST submitted by  |
| Posted: 25 Jan 2016 01:20 AM PST <!-- SC_OFF --><div class="md"><p>My guess is that it has something to do with different mechanisms of scattering and absorption but I probably still miss something.</p> </div><!-- SC_ON --> submitted by  |
| Do spaces with time-like dimensions have spheres? Posted: 25 Jan 2016 12:52 AM PST <!-- SC_OFF --><div class="md"><p>Isn't a sphere the set of points that are separated from the origin by a constant distance? Thus in euclidean space in 2 dimensions it is a circle (a 2-sphere) and in 3 dimensions a ball (3-sphere). For 4 dimensions there would also be a hybersphere (a 4-sphere). As I understnad if you viewed 3d cross sections of a 4-sphere scanning along the missing one you would see a point expand into a ball growing to a max size and then shrink into a point again.</p> <p>How about Minkowksi space? It is defined with a metric so surely it can be set to 1. Wouldn't such an object be a 3+1-sphere? How would the scan of cross-sections differ from the 4-sphere?</p> <p>This is a narrowed down question extracted from a <a href="https://www.reddit.com/r/askscience/comments/41j3cf/is_it_possible_to_uturn_in_flat_minkowski_space/">larger question</a> that didn't seem to grab anyones attention.</p> </div><!-- SC_ON --> submitted by  |
| How does one hasten copper turning green? Posted: 25 Jan 2016 12:31 AM PST <!-- SC_OFF --><div class="md"><p>I've heard that in the Swedish great power era when buiding houses with copper roofs they'd somehow hasten the effect of it turning green</p> <p><a href="http://maestrobytumlare.com/wp-content/uploads/2011/11/Stockholm-Sweden.jpg">where one can see a number of copper roof buildings</a></p> </div><!-- SC_ON --> submitted by  |
| How do planets "capture" a moon? Posted: 24 Jan 2016 04:09 PM PST <!-- SC_OFF --><div class="md"><p>The leading hypothesis for how many of our solar system's moons originated is through capture. For example, Mars' moons, Phobos and Deimos, are believed to be captured asteroids, AFAIK.</p> <p>After playing many many hours of Kerbal Space Program, I believe I have a reasonably good layman's understanding of orbital mechanics. But I still can't comprehend how an unpowered hunk of rock can be "captured" by a planet into a stable orbit. As the approaching rock falls into the planet's gravity well, I'd think it would follow a hyperbolic path that takes back into interplanetary space. For a capture, it would need to reduce its velocity relative to the planet (ideally, near periapsis). If this is done through aerobraking, then the periapsis would never leave the atmosphere (as a chunk of rock can't boost its own periapsis), and thus the orbit would decay. Without something to slow the rock down as it passes the planet, it seems it would simply exit the planet's gravity well without capture.</p> <p>So how does "capture" actually happen in real life? Is it a more complicated feature of orbital mechanics enabled by n-body physics? Or is it something more obscure like energy loss through tidal forces?</p> </div><!-- SC_ON --> submitted by  |
| Posted: 25 Jan 2016 01:50 AM PST submitted by  |
| Are there more photons or atoms in the universe? Posted: 24 Jan 2016 01:01 PM PST <!-- SC_OFF --><div class="md"><p>I know states of matter change constantly, but I wonder about their relative numbers at any given moment.</p> </div><!-- SC_ON --> submitted by  |
| why all the functions are multiplied by (e^something) in transformations like laplace and fourier? Posted: 24 Jan 2016 12:17 PM PST submitted by  |
| Posted: 25 Jan 2016 12:13 AM PST submitted by  |
| what can the total derivative do that partials cant? Posted: 25 Jan 2016 12:05 AM PST <!-- SC_OFF --><div class="md"><p>I am curious what the functional difference between partial and total derivatives are. like what can totals do that partials cant? I know partials hold all variables constant except for the given whereas the totals just assumes everything is a function of the given but the latter just seems like a semantic, esoteric generalization - since if the other variables really arent a function of the given, they will get reduced to 0 all the same - resulting in the same partial. And since in real life, 99% of the time we already know what is a function of what, it feels like the total derivative is just a "safe/generalized" way at expressing a concept with negligible benefits - used in situations that in the real world is often just handled by partials (note that I am ignoring the obvious case where f(x) is only a function of one variable, where you use d instead of \partial)</p> <p>more indepth question and latex examples of my point found here: <a href="http://math.stackexchange.com/questions/1626028/functional-difference-between-dtotal-and-partial">http://math.stackexchange.com/questions/1626028/functional-difference-between-dtotal-and-partial</a></p> </div><!-- SC_ON --> submitted by  |
| Posted: 24 Jan 2016 08:47 PM PST <!-- SC_OFF --><div class="md"><p>Assume that you start in New York, and you can only travel in speeds allowable by a car - say 100 mph. Additionally, is the optimal route actually some combination of west and south due to the curvature of the earth?</p> </div><!-- SC_ON --> submitted by  |
| Posted: 25 Jan 2016 03:25 AM PST <!-- SC_OFF --><div class="md"><p>Because water needs such a big force to compress (much higher than air), can you fill a bottle full with cold water and keep it cold because it can't expand? </p> </div><!-- SC_ON --> submitted by  |
| How do we know that stellar black hole are not neutron star ? Posted: 24 Jan 2016 11:19 AM PST <!-- SC_OFF --><div class="md"><p>How do we know that stellar black holes are not neutron star becoming too massive to let photon go away ?</p> <p>In other word, why a neutron star smaller than 3 solar masses "eating" an other star and reaching 3 solar masses collapse into a black hole ? Why this star doesn't stay a neutron star being invisible by physics ?</p> </div><!-- SC_ON --> submitted by  |
| Are there more neutrinos or photons in the universe? Posted: 24 Jan 2016 02:59 PM PST <!-- SC_OFF --><div class="md"><p>Googling produces conflicting results. <a href="http://scienceblogs.com/startswithabang/2013/07/17/the-second-most-abundant-particles-in-the-universe-are-undetectable/">This link</a> says that neutrinos are the second most abundant particles after photons, while <a href="http://hyperphysics.phy-astr.gsu.edu/hbase/astro/neutemp.html">this link</a> says neutrinos are more abundant than photons by a factor of (7/4). Which one is correct?</p> </div><!-- SC_ON --> submitted by  |
| Why is snow white? Is it not ice which is invisible? Posted: 24 Jan 2016 11:09 AM PST submitted by  |
| What is the theoretical limit to how tall mountains can get on Earth? Posted: 24 Jan 2016 06:36 PM PST <!-- SC_OFF --><div class="md"><p>I know man-made structures are limited by how much weight the lower levels can support before collapsing, is there a similar kind of height limit to mountain ranges? Does that limit change with location and types of stone, or over time, as the tectonics of Earth change? Thanks!</p> </div><!-- SC_ON --> submitted by  |
| Does the casimir effect become weaker over time? Posted: 24 Jan 2016 04:16 PM PST submitted by  |
| Working out when you'd arrive on Earth after leaving Mars going Via Saturn? Posted: 24 Jan 2016 09:10 PM PST <!-- SC_OFF --><div class="md"><p>You're on Mars, you're heading back to Earth but you need to drop into Saturn to pick up...Stuff. How do you tell NASA what time to have lunch ready?</p> <p>How would you quantify time in the equation? I assume you have to adjust the time quantity according to your velocity (relative to earth) and strength of gravity field (also relative to earth)?</p> <p>How do you do this? I probably wont understand the answer but I'll give it a crack.</p> </div><!-- SC_ON --> submitted by  |
| Aren't the statistical methods used in medical research lead to a loss of lots of useful data ? Posted: 24 Jan 2016 06:43 AM PST <!-- SC_OFF --><div class="md"><p>Usually most medical studies and certainly high quality ones(like systematic reviews and cochrane) , use some statistical method to generalize an answer over a group of people. </p> <p>But in the process , don't we lose information about specific sub group who have a different reaction(sometimes much better) from the average, to said treatment ? </p> <p>And what does medicine and medical interpretation do to still extract that data and not lose it ? </p> </div><!-- SC_ON --> submitted by  |
| Can someone explain why a solution of triodide and starch creates a black color? Posted: 24 Jan 2016 01:38 PM PST <!-- SC_OFF --><div class="md"><p>I understand that no reaction is occuring between the triodide and starch. They simply form a "triodide-starch complex" and the solution turns black. I would like to know a little more about why that's happening. </p> <p>(I've taken most upper division chem courses if knowing my background will help you explain)</p> </div><!-- SC_ON --> submitted by  |
| Posted: 24 Jan 2016 07:02 PM PST submitted by  |
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