Is it possible to put my bare foot on the moon? |
- Is it possible to put my bare foot on the moon?
- Why do nuclei weigh less than their protons and neutrons, but protons and neutrons themselves weigh more than quarks?
- If you placed wood in a very hot environment with no oxygen, would it be possible to melt wood?
- When food enters the stomach, does it stay there for a certain amount of time, or does it stay there until the stomach "senses" that this stage of digestion is complete and THEN it moves on?
- What would happen if you made a branch in a superconducting wire?
- How do we know so much about planets that are hundreds of light-years away?
- All other things equal, does a human burn more calories if they are taking a test and thinking really hard vs. just staring at a wall?
- Why doesn't ozone form as a 'triangle'?
- With Mars' lesser gravity would we be able to build a space elevator there with current materials?
- How large are the prime numbers used in modern encryption? Does it vary? How are they generated within the encryption algorithm, from a known list or some other method?
- How do the orbitals of a single atom of hydrogen orient themselves in space if there is nothing in his surrounding? And can the single atom and/or the orbitals rotate?
- How does a magnetic fuse on a mine detect changes in the magnetic field?
- Is Archimedes' principle somehow related to the fact that fluids take the shape of the container?
- Robots and Radiation? details below
- Regarding hurricane Nate(or any hurricane), at what point near the coast does it stop gaining strength, and at which point does it start losing strength?
- What would happen to a laser bouncing perpendicularly off of a flat mirror vibrating in phase with it?
- Why does the moon rise only 35 minutes later each day around the autumn equinox?
- How far away can the Earth's night lights be seen from?
- Do human eyebrows have a purpose?
- How and why do we produce harmonic frequencies when singing?
- What makes things smell?
- According to Issac Asimov's "The Last Question," Humanity moved from coal and Uranium to a mile-large solar panel in space. Would this be enough to satisfy our current energy demands?
| Is it possible to put my bare foot on the moon? Posted: 07 Oct 2017 08:57 AM PDT |
| Posted: 07 Oct 2017 07:36 PM PDT I've been told by my teacher that the mass of a nucleus is always lower than that of its constituent parts - if you added up 6 protons and 6 neutrons you'd get a number larger than the mass of a carbon-12 nucleus. I've also been told this is due to the nuclear binding energy, which is released when the nucleus is brought together from its constituent parts. (I guess a sub question I have is where the nuclear binding energy come from, is it taken from the neutrons and protons' masses, which results in the decrease?) I've also been told by the same teacher that nucleons are much heavier than the quarks which make them up, and this mass is energy that comes from the strong force. This seems like the same scenario as the previous one... But why does the mass increase here? Why do nuclei get lighter when brought together from constituent parts, whereas neutrons and protons themselves get much heavier when created from their own constituents (quarks)? I know there's something I'm missing here but I really can't figure it out. Thanks in advance! [link] [comments]  |
| If you placed wood in a very hot environment with no oxygen, would it be possible to melt wood? Posted: 08 Oct 2017 06:27 AM PDT |
| Posted: 07 Oct 2017 04:04 PM PDT And does this translate to hastened or delayed "stomach stage" digestion for people with conditions that affect gastric acidity/pepsin/etc? [link] [comments]  |
| What would happen if you made a branch in a superconducting wire? Posted: 07 Oct 2017 06:48 PM PDT What would happen if I had a superconducting wire that split into two, then reconnected down the line? How would the current be split up? What if one branch was longer? What if one branch was thicker? [link] [comments]  |
| How do we know so much about planets that are hundreds of light-years away? Posted: 07 Oct 2017 04:46 PM PDT |
| Posted: 07 Oct 2017 04:22 PM PDT |
| Why doesn't ozone form as a 'triangle'? Posted: 07 Oct 2017 10:29 AM PDT O3 forms a bent shape, with two single bonds, each of which are double bonds half the time. Wouldn't each of them being connected in a triangle of single bonds be far more stable? [link] [comments]  |
| With Mars' lesser gravity would we be able to build a space elevator there with current materials? Posted: 07 Oct 2017 11:15 PM PDT I am under the impression that the weight/strength issue is what hinders this project on earth; and that carbon nano-tubes(fibers?) seem to be the only promising solution that we hope for....I'm fond of the idea of industrial spider-silk myself... BUT with the lesser gravity on Mars, perhaps we don't need to develop anything new? Maybe we could build an operational Martian space elevator using the same synthetic(the name of which eludes me) that's replacing aluminum in aircraft construction? [link] [comments]  |
| Posted: 07 Oct 2017 07:36 AM PDT Or does my question betray a fundamental misunderstanding of cryptography? [link] [comments]  |
| Posted: 07 Oct 2017 10:15 AM PDT |
| How does a magnetic fuse on a mine detect changes in the magnetic field? Posted: 07 Oct 2017 10:22 PM PDT And a small secondary question - what is the maximum theoretical range to detect changes? [link] [comments]  |
| Is Archimedes' principle somehow related to the fact that fluids take the shape of the container? Posted: 07 Oct 2017 11:49 PM PDT |
| Robots and Radiation? details below Posted: 07 Oct 2017 10:37 PM PDT How can high exposure to radiation from nuclear disasters like Chernobyl and Fukushima, fry the circuit boards of robots sent for investigation? I have seen some articles where some robots which were sent to investigate the meltdown of the nuclear reactor 'died' when they got close to the reactors. The stated reason was wiring damage, so how exactly this type of radiation destroy the wiring? [link] [comments]  |
| Posted: 07 Oct 2017 02:21 PM PDT More specifically, the center of circulation is barely offshore. But almost half the storm is over land. With the center of circulation currently 50 miles south of the mouth of the Mississippi, it's probably over very shallow and brackish water. Does that make a difference as to whether or not it can continue to absorb energy from the ocean? Second question. What part of the storm is responsible for sucking up energy from the ocean and which part is responsible for distributing energy? [link] [comments]  |
| Posted: 07 Oct 2017 09:11 PM PDT |
| Why does the moon rise only 35 minutes later each day around the autumn equinox? Posted: 07 Oct 2017 07:20 AM PDT On average, each moonrise is delayed of about 50 minutes from the previous one. I've heard it explained that this delay is only about 35 minutes around the autumn equinox (at mid latitudes) because of the angle between the ecliptic and the horizon but I don't get why should this angle vary along the year. Edit: this is the article that spawned my doubts: http://earthsky.org/astronomy-essentials/harvest-moon-2 [link] [comments]  |
| How far away can the Earth's night lights be seen from? Posted: 07 Oct 2017 11:56 AM PDT I was looking at some videos of Earth from space at night (or since you're in space, I guess it's more about what side of the planet you're on rather than what time of day it is) and I wondered how far these lights can be seen from. Can you still see them when you're halfway to the moon? [link] [comments]  |
| Do human eyebrows have a purpose? Posted: 07 Oct 2017 09:42 AM PDT Why do we have them? Have they served some function throughout evolution? [link] [comments]  |
| How and why do we produce harmonic frequencies when singing? Posted: 07 Oct 2017 01:28 PM PDT Let's consider we want to produce 440Hz sound waves, or the note A4. So our brain tells the muscles in our larynx to open and close the vocal folds 440 times a second. However, the larynx, being mechanical, does this job imperfectly. 1) Let's assume we have a direct current of air (DC). 2) Every 1/440 seconds, or 0.0023s our folds should close. This hits the air molecules. 3) Between the 1st and 2nd hit, the affected air molecules essentially bumped into the folds (and each other) twice in 0.0046 seconds, or at a rate of 1/440 seconds. Yippee! A4 is produced. This displacement of them hitting the folds and then into each other, and then back into the folds over 0.0046 seconds, is wave-like in nature. These sound waves then travel up the vocal tract, and are further affected by resonators, which somehow give the voice timbre because they affect the sound frequencies to produce different pitches. Questions: 1. Some say the vocal folds produce harmonic frequencies, but how is this possible if they vibrate at say 440Hz, that they can also produce sound waves at 220Hz, 880Hz or 1320Hz. Do these get produced in the mouth resonators?2. If so, what is so special about them? On the spectrum, we see that there are virtually all frequencies present, then why are there peaks at other frequencies that aren't A4, and instead are integer multiples of them? How is this explained with what goes on in the vocal tract.[link] [comments]  |
| Posted: 07 Oct 2017 04:45 PM PDT After thinking about mass and how much mass something looses over time, I came across the question, "Do things things lose mass, and the lost particles are odor?" [link] [comments]  |
| Posted: 07 Oct 2017 01:15 AM PDT
Would this supply enough power to replace all current energy generation on earth at the moment? If not, how large would the panel need to be if it operated at 100% efficiency? [link] [comments]  |
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