Does the craving of different foods at different times have to do with what nutrients your body is currently in need of (protein vs carbs for example)? |
- Does the craving of different foods at different times have to do with what nutrients your body is currently in need of (protein vs carbs for example)?
- How do scientists achieve extremely low temperatures?
- How do we know the approximate temperature of distant objects, like planets and stars, as well as from a very long time ago?
- At what temperature do muscles operate optimally, and why?
- Why does sugary drinks heat faster than simple water in a microwave oven?
- For every action, there is an equal and opposite reaction. The universe is still expanding from the Big Bang, is it fair to say that it will some day contract and return to a homogeneous state with little to no empty space?
- How dense must a cloud be to completely obscure vision? What is the ratio of ppm to distance light travels through the cloud.
- If moving electrons produce changing electric field, and if changing electric field produces magnetic field, every electron must produce an electromagnetic wave. This means an atom in its natural state must emit light or other waves in electromagnetic spectrum. But why doesn't this happen?
- How can the sea level differ between the Atlantic and the Pacific (around Panama) since they are connected by the antarctic ocean?
- How long will it be until new maps will need to be made due to the continents moving?
- Carbon Trust: 'A photocopier left on overnight uses enough energy to produce over 1500 copies'. Am I missing something or is this utter rubbish?
- What does the airport security swab thing do and how does it work?
- [Engineering] If "fast charging" works by increasing amperage, then why can't we just keep increasing amperage to have a super fast charging device?
- Couldn't the same technology in a double-walled, vacuum-sealed bottle (like a Stanley or Yeti) be used for buildings, allowing for super efficient heating and cooling?
- Do Microwaves (The appliance) "heat up" or are they instantly as hot as they get?
- How much does an individual's DNA change over a lifetime?
- Does Cholesterol in cellular membrane possess any glycerol structure?
- Are flies more attracted to different colours than others?
- At very high gravities are thermobaric properties asymmetrical?
- Does Vitamix blending kills probiotics, enzymes or damages chlorophyll in raw whole plant foods?
- How do we know that vaccines work and are responsible for protecting against certain diseases?
| Posted: 22 Jul 2016 12:21 PM PDT |
| How do scientists achieve extremely low temperatures? Posted: 23 Jul 2016 07:10 AM PDT From my understanding, refrigeration works by having a special gas inside a pipe that gets compressed, so when it's compressed it heats up, and while it's compressed it's cooled down, so that when it expands again it will become colder than it was originally. How are extremely low temperatures achieved then? By simply using a larger amount of gas, better conductors and insulators? [link] [comments]  |
| Posted: 23 Jul 2016 07:32 AM PDT I was looking at this very interesting infographic about temperatures in the universe, and it listed objects such as the Boomerang nebula - which is 5000 light years away - as well as the universe at 10-35 seconds old. How can scientists calculate the temperature of stars and nebulae from so far away, and how can they calculate the temperature of the universe from so long ago? [link] [comments]  |
| At what temperature do muscles operate optimally, and why? Posted: 23 Jul 2016 01:32 AM PDT |
| Why does sugary drinks heat faster than simple water in a microwave oven? Posted: 23 Jul 2016 07:20 AM PDT |
| Posted: 23 Jul 2016 07:02 AM PDT Title says it all, but is it too expanded to return to its original state? Thanks! [link] [comments]  |
| Posted: 22 Jul 2016 12:09 PM PDT This is a smaller part of a larger hypothetical question I am trying to work through. There is a lead box that is missing one of its six sides buried underground. The open face of the box is the part that is deepest underground. Superman can look through anything that is not lead. Superman would logically fly partially around the earth until he had an oblique enough angle to peer straight through the earth and see the open underside of the box to determine what is inside. Here is the question. How much of the earths crust would need to be in supermans way before he could NOT see through it because the cumulative number of lead particles he is trying to look through is too much, the way that normal humans can see through a little bit of water vapor but cannot see through a large cloud Once I have an algorithm for (X) ppm multiplied by (X) distance I can plug it into the numbers I pulled from geological survey papers. Top soil in the US has an average of 10 ppm of lead and a range of 7 to 20 ppm The Crust has an average of 15 ppm with a range of 1 to 30 The Mantle has a mere 0.185 ppm After I have figured out the appropriate distance through the earth I am going to have to figure out some geometry for how deep the box must be buried. This Cloud problem has really derailed me. Any help you can offer would be greatly appreciated. [link] [comments]  |
| Posted: 22 Jul 2016 10:02 AM PDT |
| Posted: 22 Jul 2016 01:03 PM PDT |
| How long will it be until new maps will need to be made due to the continents moving? Posted: 23 Jul 2016 12:28 AM PDT |
| Posted: 22 Jul 2016 12:50 PM PDT All over my workplace there are the bog-standard 'reduce energy expenditure' posters, fairly standard these days. I was having a fairly slow day today and noticed one from the Carbon Trust that states 'A photocopier left on overnight uses enough energy to produce over 1500 copies'. "That sounds utterly ridiculous" I thought to myself, so I decided to look into it. This is the example they give:
This doesn't look remotely right to me... So I looked up the specs of our office copier (Ricoh, can't remember the model) and ran my own calculations:
Core hours for our office are 9am-5pm, this means 16 hours 'idle' time 5pm - 6am (note this is 2h longer than in their example!). 16h * 0.00088W = 0.01408kWh consumed overnight. The amount of copies produced in an hour for a continuous print job = (3600s - 55s) / 6.7s = 529 copies. In full operation the copier consumes 1.6kW, and therefore: 1.6kWh / 529 copies = 0.003024kWh/copy With the energy consumed overnight while 'idle' and the 'energy per copy' I can therefore work out that the actual number of copies that can be produced with the energy wasted overnight is in fact: 0.01408kWh / 0.003024kWh/copy = 4.656 copies A little less than the 1700 copies they quote! Have I done something horrendously wrong here, are they using outdated information or is this simply a campaign of misinformation? At best I figure they must have missed a decimal point in their sleep power usage... which would put their number at a more reasonable 17 copies... Everywhere you look online regarding energy saving in the office this value is quoted, and I simply can't wrap my head around where they obtained these values from. EDIT: Uhh I don't know if that's the most appropriate flair but I try :| [link] [comments]  |
| What does the airport security swab thing do and how does it work? Posted: 22 Jul 2016 03:46 PM PDT Just going through an airport now and was wondering what the swab thing does? The patch of white attached to a handle that they swab over your hands with. What exactly is it? edit: flaired "chemistry" but honestly I have no idea. [link] [comments]  |
| Posted: 22 Jul 2016 04:30 PM PDT The title sums it up mostly. iPhones draw 1A when charging. iPads I believe draw 2.1A because they have bigger batteries. My Nexus 6P draws 3A and thus charges much faster than an iPhone. So why can't we just make a phone that draws, say 10A and charge in minutes? [link] [comments]  |
| Posted: 22 Jul 2016 01:28 PM PDT I feel this could work, with the right ventilation system. Are there reasons it wouldn't? Or does this already exist? [link] [comments]  |
| Do Microwaves (The appliance) "heat up" or are they instantly as hot as they get? Posted: 22 Jul 2016 04:06 PM PDT Would a Microwave be hotter or more powerful 5 minutes into cooking or is it the same from the beginning? [link] [comments]  |
| How much does an individual's DNA change over a lifetime? Posted: 22 Jul 2016 10:14 AM PDT All cells divide, except neurons. Each mitosis division requires error prone DNA replication, which in turn causes mutations. Considering things like shortening telomeres, UV radiation, and cancer, there are a lot of opportunities for an individual's DNA to change. How much does it change over a lifetime? [link] [comments]  |
| Does Cholesterol in cellular membrane possess any glycerol structure? Posted: 22 Jul 2016 08:48 PM PDT |
| Are flies more attracted to different colours than others? Posted: 22 Jul 2016 11:00 AM PDT TL;DR Do flies prefer to hang around certain colours? Why? So me and my father are camping in Lappland, Sweden and we have been eating our meals out in the wild by our tent. He has been eating and drinking in peace while I have been in a war with the flies. They all seem to LOVE my pink camping mug, and gather around it in groups while my father's mug have not had a single fly land on it. His mug is dark green. Is it because flies see my mug better in this environment, or is it because flies, just like me, love a little colourful touch to their daily lives? Answers with any kind of information is greatly appreciated so that my father and I can end our own speculations. EDIT: By following the link you will see a picture of my father's mug versus my mug. http://m.imgur.com/h3MV3We,h8xCoVb http://imgur.com/Bik0UGa [link] [comments]  |
| At very high gravities are thermobaric properties asymmetrical? Posted: 22 Jul 2016 06:13 PM PDT By the gods if I had the maths to avoid that word salad I would use it. [link] [comments]  |
| Does Vitamix blending kills probiotics, enzymes or damages chlorophyll in raw whole plant foods? Posted: 22 Jul 2016 08:10 AM PDT I am wondering about damage on cell level that Vitamix may be causing while blending plant based foods. E.g. if I blend kombucha, spinach, or an apple -- will it kill probiotics in kombucha, damage chlorophyll in spinach, or kill enzymes in the apple? Thanks so much! I can't wait to read what you post. :) [link] [comments]  |
| How do we know that vaccines work and are responsible for protecting against certain diseases? Posted: 22 Jul 2016 12:14 PM PDT Anti-vaxxers always state there are no double blind randomized controlled trials. If that is true, then how do we know for sure that the vaccines are helping to protect against certain disease? [link] [comments]  |
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