What is mass? |
- What is mass?
- How much better equipped would we be today at rehabilitating the Red Zone at the eastern French border than in the 1920s?
- If you took a coil into space and spun a magnet inside it, will it ever stop spinning? Assuming you're a vacuum and zero gravity. Also, how much electricity would that produce?
- We know of an absolute zero, in which the speed of the molecules at this temperature reaches zero. Is it possible that there is an absolute max temperature, in which the speed of molecules is equal to the speed of light?
- I was watching Apollo 13 and they had a couple burns to help their momentum back to Earth and it got me curious. How does it work when spacecraft thrusts in a vacuum, I mean if there's nothing to thrust against how does it affect the momentum?
- Will the jets of Enceladus ever run dry?
- What determines what surfaces a given pen can write on?
- Why is alpha radiation more desctructive than gamma radiation although gamma radiation has more energy?
- Can computing help solve a thought experiment? Random Generation of the Mona Lisa
- At What Concentration Does Tetrachloroethylene Break Down Calcium in Plumbing?
- The Earth spins at roughly 1000 mph. A ball thrown in the air doesn't fall behind the Earth like a ball thrown from a moving vehicle. Is this because of the momentum at 1000 mph or does the Earth's gravity play a part?
- Should things disappear due to smell?
- When a charged particle accelerates under an applied electric field, what's 'pushing' it?
- Why is 0! = 1?
- If you had a large container that was filled with gas, and 2 perfectly stationary balls positioned near each other in it, if gravity didn't exist, would the pressure of the gas move these balls towards each other?
- What is the point of minus sign in Minkowski space?
- I have a magnet and I attach paperclips to it. Does the magnetic force stay constant? Is the force attracting the first paper clip the some strength as the force attracting the 100th?
| Posted: 10 Jun 2016 03:20 AM PDT |
| Posted: 10 Jun 2016 05:32 AM PDT The Red zone in France is an area which was deemed unsuitable for human activities on account of the large amount of unexploded ordnance, heavily polluted soils and chemical weapons hidden throughout the land. The decision to set this land apart was taken right after WWI, and the criteria used to define this territory were based on late 1920s assessment of technology and capabilities. Reconsidering the Red Zone from the perspective of the technology and capabilities of 2016, how much better equipped would we be today at rehabilitating and decontaminating that land today compared to back in the 1920s? What would reclaiming this land and making safe for human activities entail? Would it be feasible, how long would it take, would it be worth the effort? [link] [comments]  |
| Posted: 09 Jun 2016 07:50 PM PDT Wouldn't this be an easy way to generate power for the space station? [link] [comments]  |
| Posted: 09 Jun 2016 02:40 PM PDT |
| Posted: 09 Jun 2016 11:13 PM PDT |
| Will the jets of Enceladus ever run dry? Posted: 09 Jun 2016 10:50 PM PDT I was watching Space's Deepest Secrets and they talked about the moon Enceladus and the jets it has blasting water into space. My question is, why hasn't Enceladus run out of water? I don't normally post here so I apologize if this is a stupid question. http://www.nasa.gov/multimedia/imagegallery/image_feature_1856.html [link] [comments]  |
| What determines what surfaces a given pen can write on? Posted: 09 Jun 2016 02:33 PM PDT |
| Posted: 09 Jun 2016 11:26 AM PDT |
| Can computing help solve a thought experiment? Random Generation of the Mona Lisa Posted: 09 Jun 2016 06:13 PM PDT When I was 10ish (33 now) I was flicking through the channels and landed on a debate i'm not sure what the debate was about but the speaker at the time said something along the lines of "The odds of the universe being created without a God is less likely than a dump truck driving into a wall where the rubbish that hit the wall will recreates the Mona Lisa" This has stuck with me ever since, not that I believed what he said but me just wanting to know how possible, if possible at all will it be that a dump truck driving into a wall can re create the Mona Lisa. In a universe that's timeless and has trucks driving into walls every second surely there's at the least the possibility of a recreation. No doubt there aren't enough trucks on this earth and maybe not even enough time in the earths existence to have success with this experiment but what I am wondering is can computing help? A system I can think of could be something like this. •The software has a canvas, lets say 800 x 800 pixels •A script is then executed which assigns each pixel its own color •Once executed there the image will be saved in a location •The process repeats itself •A reverse lookup can then be used in attempts to find the Mona Lisa With the current computing power (how many saves a second is possible?) (how big of a HDD is needed for such an operation?) how likely is a result from such an experiment? [link] [comments]  |
| At What Concentration Does Tetrachloroethylene Break Down Calcium in Plumbing? Posted: 10 Jun 2016 12:45 AM PDT I'm referring to the Newmark Groundwater Contamination Site; Health Officers had found levels of lead in excess of 15ppb at two locations, but investigations were impaired when they were all but wiped out in the San Bernardino shooting. Does this substance make water inherently more corrosive to lead and solder? [link] [comments]  |
| Posted: 09 Jun 2016 02:49 PM PDT Also hypothetically, how would you stop an object so that the ground speed is 1000 mph faster? [link] [comments]  |
| Should things disappear due to smell? Posted: 09 Jun 2016 02:38 PM PDT So smell is basically just small particles in the air right? Like when you smell bacon it's due to teeny particles of bacon in the air being picked up in your nose. So technically shouldn't things eventually just disappear due to smell? Or at least get smaller? If so how long would it take for a specific object to become noticeably smaller or be gone? [link] [comments]  |
| When a charged particle accelerates under an applied electric field, what's 'pushing' it? Posted: 09 Jun 2016 04:50 PM PDT I'm confused as to how a field mediated by photons would impart a force on a charged object. For instance, why should a larger charge result in a larger resultant force? What's actually going on when the particle starts to accelerate under the influence of the field? [link] [comments]  |
| Posted: 09 Jun 2016 03:51 PM PDT |
| Posted: 09 Jun 2016 09:21 PM PDT As in, there is less gas between the balls than there is everywhere else, so would the balls move towards each other? [link] [comments]  |
| What is the point of minus sign in Minkowski space? Posted: 09 Jun 2016 03:09 PM PDT I am failing to understand the full usefulness of Minkowski's choice to give time a sign opposite of space (-+++ or +---) in his famous s2 = x2 + y2 = z2 – (ct)2 . The answers (other than: "that's just how it is") fall into two categories: 1) It's completely random, but convenient because it makes is easy to tell events which can no cause each other ("space-like separation") from ones that can ("time-like separation") by the sign of the answer. (Which is nice, but seems hardly a big deal) First of all, the two answers seems to be mutually exclusive. If we were to draw an X & T two dimensional chart where both axes have positive values, then a shifting of frames would rotate simply rotate both axes by same degree keeping them 90deg to each other instead of moving them toward each other. Looking at using good-old Pythagoras theorem, one would write X2 + (CT)2 = S2 But X'2 + (CT')2 also equals S2. I.e. - X'2 + (CT')2 = X2 + (CT)2 = S2 Meaning S2 is still showing to be invariable and without the use of any minus signs. So why add all the awkwardness of negative CT? [link] [comments]  |
| Posted: 09 Jun 2016 09:07 PM PDT Assuming each paper clip is contacting the magnet with equal surface area [link] [comments]  |
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