If a spacecraft travelling at relativistic speed is fitted with a beacon that transmits every 1 second would we on earth get the signal every second or would it space out the faster the craft went? |
- If a spacecraft travelling at relativistic speed is fitted with a beacon that transmits every 1 second would we on earth get the signal every second or would it space out the faster the craft went?
- Why is helium still a liquid at 0K?
- Why is "that was just the initial condition" not considered as an answer to the horizon problem?
- I understand why different atoms have different absorption spectrum, but why does a given atom have several "peaks" in its spectrum?
- What wavelength of electromagnetic radiation is given off by iron just due to normal impacts of room-temperature air molecules?
- How much faster could time go by compared to time on Earth?
- Why metals are crystalline and not amorphous?
- Is it possible to determine what is truly stationary?
- Is there a theoretical relationship between superconductivity and gravity?
- Is evaporative cooling more efficient in a deep pool or a shallow pool?
- What evidence do we have for cosmological inflation other than it had to have happened?
- Why do some animals mate for life, and how does it benefit their survival?
- Do the conditions where the speed of light is constant exist in the real universe?
- Is there a distance from the sun, in which the temperatures in space will be similar to the temperatures on Earth?
- [Engineering] Why has no one made an engine where the cylinders are of varying sizes?
- Does it get significantly harder to heat water another degree as temps go up?
- do matter and anti matter attract?
- Are certain equations "harder" for a calculator to solve?
- After crossing over in meiosis, are the chromosome chromatids still considered sister chromatids?
- How do we know the chemical composition of compounds? (e.g. H2O, CO2)
- "Faster-than-light particles, if they existed, could be used to communicate backwards in time". How is this true?
| Posted: 27 Mar 2016 07:20 AM PDT |
| Why is helium still a liquid at 0K? Posted: 27 Mar 2016 05:55 PM PDT |
| Why is "that was just the initial condition" not considered as an answer to the horizon problem? Posted: 27 Mar 2016 05:18 PM PDT [Physics] I understand the problem is that the cmb is uniform and that implies that the early universe mixed, but did it have to mix? Couldn't it have just started off uniform? [link] [comments]  |
| Posted: 27 Mar 2016 09:37 PM PDT I would assume it's because each electron will give off a different amount of energy. But hydrogen only has one electron, and it has 5 peaks (at least in the visible spectrum, don't know if it has some elsewhere) so I suppose that's busted. Anyone care to explain? [link] [comments]  |
| Posted: 27 Mar 2016 09:25 PM PDT Essentially, the iron in this example (and literally everything else) is constantly giving off electromagnetic radiation, right? But since it's absorbing so little energy from the room-temperature air it should be really low wavelength, and thus certainly not in the visible spectrum. But I'm wondering what wavelength it is emitting? Is it radio waves? Microwaves? ULF? SLF? ELF? Thanks in advance! [link] [comments]  |
| How much faster could time go by compared to time on Earth? Posted: 27 Mar 2016 07:14 PM PDT I know that thanks to time dilation, time goes faster with less gravity. So how fast could it get compared to time on Earth? For example, is there a spot in the universe with such little gravity that I could live for a hundred years while only a year has gone by on Earth? [link] [comments]  |
| Why metals are crystalline and not amorphous? Posted: 27 Mar 2016 07:32 AM PDT Gibbs free energy equation : G = H - TS, H: Enthalpy T: absolute temperature S: Entropy, Since an amorphous structure has more entropy than a crystalline structure, which should reduce the Gibbs free energy, so why most solids exist in a crystalline state and not amorphous ? [link] [comments]  |
| Is it possible to determine what is truly stationary? Posted: 27 Mar 2016 06:10 PM PDT We tend to think of motion within a frame of reference, however the speed of light being a universal constant is in reference to the universe. To me this raises the question, could we in theorey use this fact to determine the speed and direction that the earth is moving through the universe and thereby determine what is truly stationary in reference to the universe? As a thought experiment, if you had a light source surrounded by detectors spaced eqidistantly from the source and the light source emitted a single photon towards each detector simultaneously could you determine the speed and direction at which the experiment was traveling through the universe using the slight variation in the time it took the photons traveling different directions to reach their detectors? [link] [comments]  |
| Is there a theoretical relationship between superconductivity and gravity? Posted: 27 Mar 2016 11:27 AM PDT |
| Is evaporative cooling more efficient in a deep pool or a shallow pool? Posted: 27 Mar 2016 10:50 AM PDT Interested in how shape of water volume affects evaporative cooling. Additional question would be something like: what shape would be most efficient if water was being cooled solely by evaporative cooling? Thanks in advance! [link] [comments]  |
| What evidence do we have for cosmological inflation other than it had to have happened? Posted: 27 Mar 2016 06:00 PM PDT |
| Why do some animals mate for life, and how does it benefit their survival? Posted: 27 Mar 2016 10:08 AM PDT |
| Do the conditions where the speed of light is constant exist in the real universe? Posted: 27 Mar 2016 01:38 PM PDT The speed of light can be affected by gravity and a host of other variables including (presumably) the effects of Dark Matter [link] [comments]  |
| Posted: 27 Mar 2016 08:19 PM PDT |
| [Engineering] Why has no one made an engine where the cylinders are of varying sizes? Posted: 27 Mar 2016 11:11 AM PDT It could be 6 cylinders in a line, with the closest one being the largest and then the cylinders getting progressively smaller. Would this not reduce fuel consumption due to less volume displacement? [link] [comments]  |
| Does it get significantly harder to heat water another degree as temps go up? Posted: 27 Mar 2016 12:01 PM PDT So say I put a pot of water on the range. If it takes x amount of time to heat up from 50 to 60 will it also take x amount to go form 60 to 70? Or does it get harder to heat up as it goes up? [link] [comments]  |
| do matter and anti matter attract? Posted: 27 Mar 2016 04:31 PM PDT So a particle and an anti particle of any type have opposite characteristics, correct? (like how an electron has a negative charge and a positron has a positive charge) So if matter attracts other matter, then anti matter would detract(is that a word?) other matter. But I thought that opposites always attract, don't they? or does the gravitational force of opposite particles not apply in this situation. Questions simplified:
[link] [comments]  |
| Are certain equations "harder" for a calculator to solve? Posted: 27 Mar 2016 08:21 AM PDT Does a simple operation take less time or computing space than a complicated operation? [link] [comments]  |
| After crossing over in meiosis, are the chromosome chromatids still considered sister chromatids? Posted: 27 Mar 2016 10:41 AM PDT Like since they are no longer identical after crossing over would thy no longer be sister chromatids and identical? [link] [comments]  |
| How do we know the chemical composition of compounds? (e.g. H2O, CO2) Posted: 27 Mar 2016 04:28 AM PDT |
| Posted: 27 Mar 2016 05:00 AM PDT I have a problem with this and maybe someone is able to explain why it is true. Why can we send information backwards in time using faster-than-light particles? The information will arrive faster than the light, that's all. How is this "backwards in time"? I just don't get it. Is time considered to be connected somehow with the speed of light? [link] [comments]  |
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