Does washing off fruits and vegetables before eating them actually remove much of the residual preservatives and/or pesticides? |
- Does washing off fruits and vegetables before eating them actually remove much of the residual preservatives and/or pesticides?
- Does radioactive decay reduce an object's mass?
- Is there a limit to how strong magnets can be? Or can we make stronger and stronger magnets with technological development/resources?
- How do firefighters put out fire on top floors of skyscrapers?
- How do we know the percentages of life that were wiped out in mass extinctions?
- Can single-cell organisms get cancer?
- After element 20, the neutrons begin to outnumber the protons in stable isotopes. Why do they need the extra neutrons?
- If sunscreen absorbs UV light, does that mean that sunscreen makes you warmer?
- Why is forming a chemical bond described as exothermic, whilst it appears to be endothermic?
- Can photons be slowed down by gravity?
- Why does being exposed to radiation increase your chance of cancer in the future?
- Why are both neutrons and protons required for stable nuclei (excluding hydrogen)? Why is there a more-or-less specific ratio between neutrons and protons?
- Why can't we convert the kinetic energy of the tires spinning back into energy to charge the battery of electric cars?
- Can a proton that is the result of beta minus decay undergo beta plus decay and the resulting neutron undergoes decay again and so on? If so, how many times?
- Is there a reason for the hexagonal pattern on the doors of microwaves?
- If a molecule can only have fixed energy levels then why is a Boltzmann distribution a smooth curve?
- Was it possible to see the first moonlanding via a telescope on our planet?
- If a nuclear apocalypse were to happen, and every single nuclear weapon in the world was used, how long would it take for the accumulating fallout to decay and make the surface habitable?
- Why are weather patterns so different in different parts of the United States?
- Do large nuculii extend beyond the range of the strong force?
- Why do storms develop after a hot day? And why do these storms sometimes get forecast but then seem to get pushed back later and never end up developing?
- Could electromagnetic power be transmitted over long distances as magnetic flux instead of electric current?
| Posted: 28 May 2018 10:07 PM PDT |
| Does radioactive decay reduce an object's mass? Posted: 28 May 2018 10:25 AM PDT I've been trying to understand e=mc2 and one implication of that seems to be that emitting radiation (energy) would mean that an object's mass decreases. At least on a theoretical level, maybe not measurably. Is this the case? If not, how can that be reconciled with the equation? [link] [comments]  |
| Posted: 28 May 2018 03:20 PM PDT If there is a limit, what sets it? If not, what is needed for a stronger magnet? [link] [comments]  |
| How do firefighters put out fire on top floors of skyscrapers? Posted: 29 May 2018 05:32 AM PDT |
| How do we know the percentages of life that were wiped out in mass extinctions? Posted: 29 May 2018 07:27 AM PDT I did a little digging in the sub(and Google) but couldn't find a question like this. How would we know that the Permian extinction wiped out roughly 90% of the planets population for example? From what I understand most of the fossilized remains we have recovered only represent a practically non-existent percentage of life that has existed throughout history. How can we even estimate current extinction rates, I haven't seen a list of the supposed dozens of extinctions occurring daily?(Though if they exist I would be very interested in seeing it) [link] [comments]  |
| Can single-cell organisms get cancer? Posted: 28 May 2018 11:40 AM PDT |
| Posted: 28 May 2018 01:00 PM PDT |
| If sunscreen absorbs UV light, does that mean that sunscreen makes you warmer? Posted: 28 May 2018 02:34 PM PDT I have read that what makes sunscreen work is partly that it absorbs UV light. As everyone knows, objects in colours that absorbs visible light gets warmer in the sun (like a black t-shirt). Does that mean that you get warmer in the sun with sunscreen than without? [link] [comments]  |
| Why is forming a chemical bond described as exothermic, whilst it appears to be endothermic? Posted: 28 May 2018 10:16 PM PDT Little bit of background info: Currently I study UK A-Level Chemistry and physics, so please don't expect too much. Recently, when studying energetics (enthalpy changes, bonding, etc.) I noticed what appeared to be contradicting statements. For chemical bonding, in terms of energetics, we are taught exclusively that bond breaking is endothermic, and bond forming is exothermic (in all cases). This however contradicts other information that I have read in terms of bonding within carbon; that is that when carbon forms four covalent bonds, the electrons in the 2s sub-shell move to the (higher energy) 2p sub-shell making a hybrid orbital with four electrons. If electrons move to a higher energy level to allow bonds to form, such an interaction would require energy to be taken in by electrons to be in an excited state, and therefore be endothermic. It is taught in our syllabus however, that bond forming is exothermic. I have no doubt that my syllabus is correct, but could someone offer an explanation as to why this is the case? I asked both of my chemistry teachers, yet couldn't get an explanation, and searching the web fails to find specific enough results. Footnote: Sorry about the formatting, and any grammatical errors, this was posted on mobile. and for the unrelated title, I really didn't know what to put considering the question mark was compulsory. EDIT: Thank you all for all of the excellent quality, understandable answers, and I look forward to reading into this concept a little more after the school break as it does seem quite interesting. [link] [comments]  |
| Can photons be slowed down by gravity? Posted: 28 May 2018 02:01 PM PDT |
| Why does being exposed to radiation increase your chance of cancer in the future? Posted: 28 May 2018 02:14 PM PDT By this I mean, why does it increase your chances later in life and not just as soon as you are exposed [link] [comments]  |
| Posted: 28 May 2018 02:57 PM PDT And what causes instability in neutron-rich nuclei, if it's the protons that destabilize the nucleus due to electrostatic repulsion? [link] [comments]  |
| Posted: 28 May 2018 05:51 PM PDT |
| Posted: 28 May 2018 09:12 PM PDT Artificially/Naturally I understand that mass is converted into energy and if so, how many times can it happen? [link] [comments]  |
| Is there a reason for the hexagonal pattern on the doors of microwaves? Posted: 29 May 2018 03:26 AM PDT Or is it just better if we don't see what's in there 100% clearly? [link] [comments]  |
| If a molecule can only have fixed energy levels then why is a Boltzmann distribution a smooth curve? Posted: 28 May 2018 01:12 PM PDT Hi, If a molecules energy level is quantized, why does a Boltzmann distribution look like this: http://noyesharrigan.cmswiki.wikispaces.net/file/view/MD_distribution.png/250991340/MD_distribution.png and not a linear distribution? [link] [comments]  |
| Was it possible to see the first moonlanding via a telescope on our planet? Posted: 28 May 2018 12:46 PM PDT |
| Posted: 28 May 2018 06:32 PM PDT |
| Why are weather patterns so different in different parts of the United States? Posted: 28 May 2018 02:15 PM PDT I don't mean so much the climates, rather the manifestation of weather. On the East Coast, it will rain for days on end, while in the desert, in the West, it will rain very hard for about half an hour and then it will be sunny for the rest of the day. What factors cause such a difference in the way that weather occurs? [link] [comments]  |
| Do large nuculii extend beyond the range of the strong force? Posted: 28 May 2018 12:44 PM PDT |
| Posted: 28 May 2018 12:35 PM PDT Self-explanatory title, but I just wondered because we have had a few hot days in the UK, and each day a storm has been forecast for early-mid afternoon. Then by the time it gets to midday it is pushed back later, and later.. what makes it so difficult to predict when/if a storm will develop after a hot day? [link] [comments]  |
| Posted: 28 May 2018 09:09 PM PDT My understanding of electromagnetism isn't as complete as I would like, but as I understand it, magnetic flux would rather be contained within ferromagnetic material than in the dielectric surrounding it, which seems like it should be better for power transmission than electric current which is in the dielectric surrounding the electric conductor. This difference makes it seem like the magnetic flux "resistance" (or what is the correct term?) of a ferromagnetic wire or chain should be lower than the resistance of electric wire. The flux might be alternating, rotating or possibly even both alternating and rotating depending on what is able to be transmitted most efficiently. It seems like at least one big advantage of using magnetic flux instead of electric current would be in the use of cheap iron wire or chain rather than more expensive aluminum, copper or copper-plated electric wire. I assume someone must have already thought of this if it really is a viable idea, so what am I forgetting? [link] [comments]  |
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