Why do lenses have shadows? |
- Why do lenses have shadows?
- Looking at how stereo is implemented in vinyl records, it would seem very hard to get two entirely independent channels. Is that one of the things that makes the "vinyl sound"?
- Why is the ozone hole only over Antarctica?
- Do babies have reason, or is their behaviour dictated solely by their insticts? (since they haven’t learned having habits like kids and adults do)
- Is there an auditory processing disorder that is similar to dyslexia?
- How hard was it to survive the Van Allen belts?
- Is thermal motion truly random?
- What happens to the blood vessels that run through our limbs when we bend or twist a joint on those limbs?
- Why are non-linearities essential to machine learning?
- Why does melting glaciers cause ocean floor to sink?
- Can any rotation about a vector in 3D cartesian space be expressed as a series of rotations about the axes?
- Does staring at a 3D rendered environment (ex: video game) on a computer cause less eyestrain then staring a 2D rendered image (ex: web browsing)?
- What happens if a satellite traveling at Voyager 1 speeds strikes the moon? Earth?
- In a major winter snow storm, is the economic impact of shutting down a city greater than the cost of adequate preparation (plowing, salting, etc.) that would keep things running?
- Is there a difference in pressure between the top and bottom of a submarine's hull?
- Why was it so cold inside Apollo 13?
- What happens if we take a entangled pair and we measure one particle with lateral spin and other particle vertically at the same time?
- How is it determined if a cosmic object is physically large as opposed to a small distance away (or vice versa)?
- How do large stars form?
- What caused the satellite in mission TSS-1r to move away from the Space Shuttle?
- If we were in a nearby star system, would SETI be able to detect our radio waves?
| Posted: 09 Jan 2018 03:18 AM PST I've noticed this with magnifying glasses ( convex) and my spectacles (concave). [link] [comments]  |
| Posted: 08 Jan 2018 09:50 PM PST |
| Why is the ozone hole only over Antarctica? Posted: 08 Jan 2018 08:19 AM PST It seems like that is a weird spot for it because not a lot of people live near Antarctica to pollute it [link] [comments]  |
| Posted: 08 Jan 2018 06:54 AM PST |
| Is there an auditory processing disorder that is similar to dyslexia? Posted: 08 Jan 2018 03:03 PM PST |
| How hard was it to survive the Van Allen belts? Posted: 08 Jan 2018 07:30 PM PST |
| Is thermal motion truly random? Posted: 08 Jan 2018 08:43 PM PST Excuse my ignorance in advance. I keep seeing these visualizations of thermal motion and it's just energetic atoms or molecules bouncing off of each other and walls. What makes this truly random? It seems like given the initial conditions the motion is predictable. [link] [comments]  |
| Posted: 08 Jan 2018 05:40 AM PST |
| Why are non-linearities essential to machine learning? Posted: 09 Jan 2018 12:39 AM PST I understand why every other hyperparameter is necessary except the non-linearities like ReLU are needed [link] [comments]  |
| Why does melting glaciers cause ocean floor to sink? Posted: 08 Jan 2018 03:10 PM PST Recently saw a news headline that said "not only are sea levels rising but the ocean floor is sinking." Sea level rising is due to the difference in density of fresh water and salt water but Isn't it the same mass of material pushing on the ocean floor? Why would melting ice into water make it "heavier"? [link] [comments]  |
| Posted: 08 Jan 2018 02:04 PM PST Say I have a traditional cartesian 3-dimensional space - nothing messy like curvilinear axes or something which would make it complicated. Can any rotation of a vector or object through an arbitrary angle θ about an arbitrary vector v be expressed as a series of rotations about each axis? Just from trying to solve it myself I think it can, so long as vector v passes through the origin but I don't have the exact mathematical background to tell for certain or prove it. [link] [comments]  |
| Posted: 08 Jan 2018 10:37 AM PST |
| What happens if a satellite traveling at Voyager 1 speeds strikes the moon? Earth? Posted: 08 Jan 2018 10:34 PM PST Voyager 1's speed is 38,610 mph or 17 km/s. It is the fastest thing ever built & I'm struggling to wrap my head around how fast that really is. The moon doesn't have an atmosphere like earths so it wouldn't burn up before striking the surface. Does Voyager travel fast enough to damage the moon in any significant way or would we notice any effect? Or is it simply too small to be nothing more than another negligible crater? If it were traveling that fast towards earth (and for some reason had a heat shield/was durable enough to withstand atmospheric disintegration) would its speed cause an extinction event such as the meteor that killed the dinosaurs? I ask since Voyagers mass is much smaller than the meteor's. I know that objects falling towards earth have a specific terminal velocity that can't be passed, but Voyager is traveling so much faster than that. Would the atmosphere really slow it down to a terminal velocity or would it simply rip right through? Maybe I'm just not understanding that right. I know this is a hypothetical question but I don't think it requires speculation since we're using real variables here. I'm more interested in how a small satellite traveling that fast would affect larger bodies. Thank you for your time! (Sorry if it's a dumb question) [link] [comments]  |
| Posted: 08 Jan 2018 08:24 AM PST I'm not asking about the straight cost of dealing with snow removal; that's only a part of the analysis. I'm interested in the more general cost-benefit analysis of adequate preparation vs shutting down and suffering lost productivity. Regardless of geographic reagion, is prevention cheaper than hunkering down and letting the weather run its course? I would hope cities that shut down in winter weather have done an economic impact analysis and found that the cost of keeping plows and salt on hand for winter storm emergencies outweighs the losses they would suffer by shutting down for a day or two. However, I understand that such studies are difficult and these decisions are often made for short-term budget reasons rather than long-term economic impact reasons. I found this article but it's pretty superficial. Do economists know whether the impact of a shutdown generally tends to outweigh the cost of adequate preparation? [link] [comments]  |
| Is there a difference in pressure between the top and bottom of a submarine's hull? Posted: 08 Jan 2018 11:34 AM PST I know submarines float due to their buoyancy. I want to know if the air inside the sub, which tends to go upwards, exerts a force on the top half of the hull (apart from its pressure which acts upon the entire hull in the same way). Does the lighter air inside it push against the top because it wants to rise? Or does it have no other effect? [link] [comments]  |
| Why was it so cold inside Apollo 13? Posted: 08 Jan 2018 07:23 PM PST Seems to me it should have been too warm. Space is not cold, it is a vacuum, a great insulator. Add to that the full force of the sun on the capsule 24/7, and three adult bodies each creating their own heat in quite a small space. The only way for the capsule to cool is radiation. Why did it cool so effectively? [link] [comments]  |
| Posted: 08 Jan 2018 06:48 PM PST If we take a entangled pair and we measure one particle with lateral spin and other particle vertically at the same ( the particle that is entangled to the first) ,Will we see a lateral spin at one end and vertical spin at other at the same time? But then that would be a violation entanglement right because the pair needs to have opposite spins? [link] [comments]  |
| Posted: 08 Jan 2018 05:49 AM PST |
| Posted: 08 Jan 2018 02:15 AM PST As far as I've understood all stars form out of discs of gas building building up at the center under the force of gravity. At a certain point the pressure gets so high that nuclear fusion starts and the object in the center turns in to a star. This also has the effect that the gas around is blown away, as it once did in our solar system. My question is how it is possible for larger stars to form. Wouldn't this have the effect that all formation of stars is halted at the minimum mass needed in order for nuclear fusion to occur? And yet there are immense stars such as hypergiants. [link] [comments]  |
| What caused the satellite in mission TSS-1r to move away from the Space Shuttle? Posted: 08 Jan 2018 02:57 PM PST Something popped into my head recently that made me start wondering about the physics involved in a 1996 Space Shuttle mission and how it relates to a scene from the movie Gravity (2013). In the movie Gravity there was a scientific inaccuracy at a crucial point in the plot. The scene involved George Clooney's character letting go of a life-saving tether attached to Sandra Bullock's character and the station. Although he was not in motion at the time, when he lets go, some force pulls him away from the station and into space. Most experts agree that he should have remained floating in place had this happened in actuality since there would have been no force acting on his body after he had come to rest. I then remembered a similar scenario in the TSS-1R mission, where a satellite had been deployed on a tether several miles long. In this case, when the tether broke, the satellite "shot away into higher orbit" (https://science.nasa.gov/missions/tss). What caused the satellite to move away from the Shuttle? [link] [comments]  |
| If we were in a nearby star system, would SETI be able to detect our radio waves? Posted: 08 Jan 2018 01:07 AM PST Assuming these waves have had the time to reach the star system in question. I ask because I imagine these radio waves would be incredibly diffuse by the time it reached another planet. [link] [comments]  |
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