How large would the surface of contact between two perfect spheres 1 centimeter in diameter be? |
- How large would the surface of contact between two perfect spheres 1 centimeter in diameter be?
- [Physics] Why exactly does a fluid dissolve a solvent when it's at a higher temperature?
- Those tests that positively identify a disease 95‰ of the time. Does taking the test a second time and getting a positive result mean you virtually, for certain, have the disease?
- Is it possible for an astral body to orbit two other astral bodies?
- Voyager 1 and 2 both carry a 12-inch golden phonograph record in the hopes that another intelligent life form may find them. However, how difficult would it be to recover the probes as they travel at nearly 40,000 MPH?
- What is the longest surviving energy/matter in the universe?
- Do all forces have their own magnetic fields?
- Does rain cause a cold front or is it the result of a cold front?
- Is it possible to 'forecast' the weather in the past?
- How does isotopic labeling work?
- When a fire detector's range is "greater than 200 feet to 1 sq. ft. heptane fire", what does this mean?
- [Physics+Math] - How do we know that temperature is a continuous function?
| How large would the surface of contact between two perfect spheres 1 centimeter in diameter be? Posted: 01 Jul 2016 09:54 PM PDT Assuming firm contact I suppose? How about for two 1 meter diameter spheres? [link] [comments]  |
| [Physics] Why exactly does a fluid dissolve a solvent when it's at a higher temperature? Posted: 02 Jul 2016 04:58 AM PDT Please go into detail, as I THINK I understand the basics (more moving particles) [link] [comments]  |
| Posted: 02 Jul 2016 03:46 AM PDT |
| Is it possible for an astral body to orbit two other astral bodies? Posted: 02 Jul 2016 07:04 AM PDT For example, if two stars were orbiting each other could a planet have a kind of figure 8 orbit around both of them? Would such a system be stable? [link] [comments]  |
| Posted: 01 Jul 2016 10:58 AM PDT Clearly the probes would have to be recovered in open space, as any collision with a spacecraft or planet would result in them being obliterated, correct? [link] [comments]  |
| What is the longest surviving energy/matter in the universe? Posted: 01 Jul 2016 12:27 PM PDT Could be anything from quarks/atoms to nebulae. What is something that takes the longest to dissipate in existence? I was thinking radio waves travelling from our planet but they will eventually be absorbed by a star or the likes of it. Black holes also have a limited lifespan. So that's out of the question I guess. Thanks. [link] [comments]  |
| Do all forces have their own magnetic fields? Posted: 01 Jul 2016 02:14 PM PDT I learned a while back that gravity has a magnetic field in the form of the gravitomagnetic field. Do the gluon and weak fields have their own magnetic components as well? If so, does this affect how, for example, the strong force's spring-like tension or the weak force's flavor-changing work? [link] [comments]  |
| Does rain cause a cold front or is it the result of a cold front? Posted: 01 Jul 2016 11:12 AM PDT |
| Is it possible to 'forecast' the weather in the past? Posted: 01 Jul 2016 07:48 AM PDT Nowadays it is quite easy to predict how the weather will look like in the forthcoming weeks. Would it also be possible to 'predict' the weather of the past by knowing the weather now? I'm aware that it wouldn't make any sense to try to forecast the weather of five days ago and it would be easier to just look into the archives, but I'm really interested in knowing if the same models used to predict the weather could also work in reverse time. [link] [comments]  |
| How does isotopic labeling work? Posted: 01 Jul 2016 12:48 PM PDT So from what I understand, you have to add a known concentration of non-radioactive material (sucrose, iodine, calcium) to the solution, and then add some isotope, and that provides data as to the behavior of that concentration of the original substance. How does this work? Can you not have enough isotope? How do you account for how much you have? [link] [comments]  |
| Posted: 01 Jul 2016 08:46 AM PDT |
| [Physics+Math] - How do we know that temperature is a continuous function? Posted: 01 Jul 2016 09:22 AM PDT There's a classic problem in math/physics stating that there exists at least one point in the world, where the temperature on the antipodal end is the same temperature. This follows easily using the intermediate Value Theorem, given that your function is continuous. But topologically, continuity states that for every open set in the image, the pre-image must also be open. Well if "f" is a function, f: [World Position] --> [World Temperature], and I assume physicists use the standard topology for these, then we can take some open set in temperature, let's say (60F, 70F), and then we find the pre-image of this temperature interval, why do we "know" that the area on the world will also be an open space?? [link] [comments]  |
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