Can you see time dialation ? |
- Can you see time dialation ?
- Does the past/present/future already exist?
- How much voltage deviation is acceptable?
- What affect does height have on running efficiency?
- If you supersaturate a solution, does whatever you saturated it with condense back out when the solution cools? If not, why not?
- Does F=ma hold true for rockets?
- If the blackbody spectrum shows a highest intensity of blue light for hot objects, why aren't hot objects intensely blue?
- Tabby's Star, KIC 8462852, the one with the unusual dimming, is it possible that it is something odd shaped that is between us and the star that is getting closer? Is there any obvious reason to rule out that it is something getting closer?
- Why does it take so long to render CGI movies compared to realtime rendering of Video Games?
- If centripetal force and gravity are balanced in a circular orbit, why doesn't the orbiting object go off on a tangent?
- Why is Titan considered a moon?
- Does the mass of the planet affect the speed of its orbit?
- How much energy would it take to boil all of Earth's oceans?
- How do clouds defy gravity, and stay floating in the sky?
- Recessive and dominant genes: what decides which is what? How come that, for example, blue eyes are recessive and brown ones are dominant?
- How does light know which path is fastest?
- What's really happening that causes altered mental status in a patient who's septic?
- Does liquid oxygen or "oxygen in a can" actually increase the amount of oxygen in my body?
- How old is a photon that came from a star a billion light years away?
- How can this train move 1 ton of freight 450 miles on just 1 gallon of fuel?
| Posted: 06 Aug 2016 12:34 AM PDT I am gonna use the movie interstellar to explain my question. Specifically the water planet scene. If you dont know this movie, they want to land on a planet, which orbits around a black hole. Due to the gravity of the black hole, the time on this planet is severly dialated and supposedly every 1 hour on this planet means 7 years "earth time". So they land on the planet, but leave one crew member behind and when they come back he aged 23 years. So far so good, all this should be theoretically possible to my knowledge (if not correct me). Now to my question: If they guy left on the spaceship had a telescope or something and then observes the people on the planet, what would he see? Would he see them move in ultra slow motion? If not, he couldnt see them move normally, because he can observe them for 23 years, while they only "do actions" that take 3 hours. But seeing them moving in slow motion would also make no sense to me, because the light he sees would then have to move slower then the speed of light? Is there any conclusive answer to this? [link] [comments]  |
| Does the past/present/future already exist? Posted: 06 Aug 2016 02:22 AM PDT I am have trouble understanding the concept of time travel. How strong is the claim that we can hypothetically travel forward/backward in time. If we can, then does the past/present/future already exist? [link] [comments]  |
| How much voltage deviation is acceptable? Posted: 06 Aug 2016 05:59 AM PDT Like if you have an USB Stick, which needs 5V, but your System only provides 4.8V. Why does it still work? Similarly, when is a battery 'empty' or 'loaded'? If you try to measure battery voltage, you get a result, but how do you find out, if the voltage is sufficient to operate the system? [link] [comments]  |
| What affect does height have on running efficiency? Posted: 05 Aug 2016 04:11 PM PDT Does being taller make it more efficient (i.e. easier) to run since you have a longer stride length? Or is that negligible since, on average, you have to carry more weight than a shorter person? How does this differ between distance running and sprints? [link] [comments]  |
| Posted: 05 Aug 2016 01:32 PM PDT |
| Does F=ma hold true for rockets? Posted: 05 Aug 2016 07:29 PM PDT So I'm pretty far removed from college, but from what I remember, F=(mv)d/dt. It just so happens for the majority of cases, mass is either constant or effectively constant, so it can be removed from the integral, leaving F=m*dv/dt. But for rockets, mass isn't even remotely constant, as you're constantly spitting out propellant. Does F=ma still hold true or does it become more complex for rockets? [link] [comments]  |
| Posted: 05 Aug 2016 03:21 PM PDT I'm not sure if I am misunderstanding the blackbody spectrum, but the spectrum (http://hyperphysics.phy-astr.gsu.edu/hbase/imgmod/wien3.gif) shows blue light having the highest intensity for hot objects. Why don't hot objects glow blue? Why do they glow red usually? Shouldn't red have the lowest intensity? [link] [comments]  |
| Posted: 05 Aug 2016 01:51 PM PDT New research shows that it is in fact dimming over the last 4 years: http://arxiv.org/abs/1601.03256 (Unlike the previously idea, widely refuted, that it was dimming over the last 100 years). [link] [comments]  |
| Why does it take so long to render CGI movies compared to realtime rendering of Video Games? Posted: 05 Aug 2016 03:19 PM PDT From Frozen wikipedia page:
30 hours per frame as opposed to 1/30 of a second per frame in any modern video game, that's a difference of about 3.24 million times of rendering time unless my math is wrong. Now I perfectly understand that Frozen looks way better than any realtime modern video game, but I'm not sure it looks 3 million times better than them, so why is there such a huge difference? [link] [comments]  |
| Posted: 05 Aug 2016 02:49 PM PDT I was reading up on a derivation of the formula for orbital period today, and it began by saying that the centripetal force and gravitational force are balanced in a perfectly circular orbit. This would explain why objects do not fall straight to the ground while in space. Now, I know the centripetal force is only a manifestation of the object's sideways velocity, which makes it want to go off on a tangent. I know it is a fictitious force, it doesn't really "come" from anything other than being in a rotating reference frame. But if it makes sense to say that centrifugal forces and gravity are balanced, then surely there are no net forces acting on the object at all. If this is the case, why does the orbiting object keep curving around the planet? Why doesn't it just float off into deep space? I understand why it doesn't if someone explains it to me without mentioning centripetal force, but I'm having trouble getting my head around this force. Thanks. [link] [comments]  |
| Why is Titan considered a moon? Posted: 05 Aug 2016 01:59 PM PDT I understand that it is orbiting Saturn, but it is the same size as mercury. Also it is extremely similar to Earth and may harbor life. So couldn't it be classified as a Planet? [link] [comments]  |
| Does the mass of the planet affect the speed of its orbit? Posted: 05 Aug 2016 11:19 AM PDT If Pluto were 1 AU from the Sun, would it move more quickly than Earth because of its smaller mass and size? My guess would be no, as there wouldn't be any real friction in the vacuum of space. [link] [comments]  |
| How much energy would it take to boil all of Earth's oceans? Posted: 05 Aug 2016 08:21 AM PDT Atlantic, Pacific, Indian, Arctic, and Southern Ocean [link] [comments]  |
| How do clouds defy gravity, and stay floating in the sky? Posted: 05 Aug 2016 08:44 AM PDT |
| Posted: 05 Aug 2016 08:51 AM PDT |
| How does light know which path is fastest? Posted: 05 Aug 2016 09:36 AM PDT According to wikipedia:
I want to understand how light "knows" which path can be traversed in the least amount of time? I have read an answer which described it as light doesn't know a-priori but takes all possible paths, and those unlikely paths "cancel" out. But I really don't understand how this is possible or how it makes any scientific sense. [link] [comments]  |
| What's really happening that causes altered mental status in a patient who's septic? Posted: 05 Aug 2016 06:26 AM PDT Along with marked hypotension and evidence of a recent infection, altered mental status is a hallmark that medics look for when diagnosing and treating sepsis in the field. What I'm wondering is, what actually causes the altered mental status? Does that mean that the infection has spread to the brain? Or is it simply the body conserving it's available energy that results in a decrease in consciousness? [link] [comments]  |
| Does liquid oxygen or "oxygen in a can" actually increase the amount of oxygen in my body? Posted: 05 Aug 2016 10:51 AM PDT Sometimes I see bigger NFL players inhaling oxygen after a long run. Could I get that without a prescription, or as a regular person? I'm almost 230, really muscular, pretty fast, but I get winded easily. Would leveraging things like liquid oxygen, or oxygen in a can as found below, actually increase the amount of oxygen in my body? https://www.amazon.com/Oxygen-Boost-Natural-Energy-Natural-22oz-5pack/dp/B0080SW2IW/ref=zg_bs_13052971_11 https://www.amazon.com/Stabilized-Premium-Concentrated-Supplement-Bottles/dp/B007LPTBYI/ref=pd_bxgy_121_img_2?ie=UTF8&psc=1&refRID=PTZAV5641J1PG7NGGN21 [link] [comments]  |
| How old is a photon that came from a star a billion light years away? Posted: 05 Aug 2016 02:19 PM PDT Let's say a photon arrives from a star a billion light years away and hits my retina, so by our time it would be a billion years old. If it had its own internal clock, how "old" would it be by its own time? [link] [comments]  |
| How can this train move 1 ton of freight 450 miles on just 1 gallon of fuel? Posted: 05 Aug 2016 02:05 PM PDT CSX posted this picture a while ago How is this possible? [link] [comments]  |
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