How can my portable battery charger drain itself completely when charging my phone? Shouldn't the two batteries come to equilibrium? |
- How can my portable battery charger drain itself completely when charging my phone? Shouldn't the two batteries come to equilibrium?
- Is there a way to find the equation of a random curve?
- Is the infinite amount of numbers between 0 and 2 more than the infinite amount of numbers between 0 and 1?
- What's the difference between polymorphism and allotropy?
- Do black holes leave any trail of exhaust?
- What determines an element's half-life, is it completely random? or based other factors, if so what factors?
- Why is there almost no potential difference between two DC power supplies?
- Why is it so difficult to span large bodies of water?
- Many influential scientific findings have come from previously eccentric mathematics, like the use of non-Euclidean geometry by Einstein to explain relativity. What weird math do we have today that doesn't seem to be useful now, but would be awesome to utilize in the future?
- Is there a (theoretical) superconductor for heat instead of electricitiy?
- What is the difference between sodium permeability and -conductance?
- Do crystals (e.g. Copper Sulphate, Aspirin) contain impurities in them, or are they pure once crystallised? If they are not pure when crystallised, what impurities are in them and what causes them to appear in the Crystal (aka why weren't they removed during purification)?
- Looking at serotonin, I notice the benzene rings, but why does the HO only have one line but the NH3 zigzags, what does that mean?
- Are all tetrahedral molecules non polar?
- CD-R says it can hold 700mb and has 80 minutes of play time. Why can I burn 7 hours of songs on it?
- What is the total amount of all gravitational potential energy in the observable universe?
- Does the Corpus Callosum stovepipe/throttle the information flow between the left and right brain hemispheres?
- Have there been any big updates since the Higgs boson was discovered?
- Why does liquid form a parabolic shape when spun in a container?
| Posted: 05 Apr 2017 09:28 AM PDT |
| Is there a way to find the equation of a random curve? Posted: 06 Apr 2017 06:18 AM PDT e.g. if I took a pencil and drew on some paper, could we express that curve as a function? [link] [comments]  |
| Posted: 05 Apr 2017 11:34 AM PDT |
| What's the difference between polymorphism and allotropy? Posted: 06 Apr 2017 04:34 AM PDT Is an allotropic element in two of its polymorphic states at the same time? I don't get it. [link] [comments]  |
| Do black holes leave any trail of exhaust? Posted: 06 Apr 2017 05:55 AM PDT When do astronomers or astrophysicist say "a black hole was here"? [link] [comments]  |
| Posted: 06 Apr 2017 03:21 AM PDT |
| Why is there almost no potential difference between two DC power supplies? Posted: 06 Apr 2017 05:28 AM PDT I'm not entirely sure if this is physics or an engineering question. I am interested in the physics. Embarrassing admittance, I actually have an undergrad degree in physics; apparently I didn't pay enough attention in E&M. I can't come up with a way to assign this a specific question as I feel there is something fundamental I am missing. Anyway, I digress, on to the explanation. I have two DC power supplies both wired into the same AC line that produce 24v. Here is an image of my horrible wiring. I imagine that the circuit diagram probably looks like something along these lines. I was playing around and attempted to wire a light from the - side of one power supply to the positive side of another. The light didn't light and I found this confusing. So I broke out my volt meter and measured the potential difference between the positive side of one power supply to the negative side of the other. This is what I saw. What? I found this extremely confusing and I'll explain why shortly. I randomly cranked up the sensitivity of my volt meter and took the measurement again. This time I did measure a potential. That's millivolts, which I have no explanation for. Even more unusual was that this oscillated between +- 40 millivolts. What the heck? Why is this oscillating, I thought this was DC? Like a good little scientist I decided to just measure every possible combination of connections between the two devices producing this table that just leaves me confused. (Note these are maximum potentials as they all oscillate for some reason). My understanding of things was that both of these power supplies generated a potential relative to ground (grounds are tied BTW). All the happy little electrons pooled at the negative DC terminal ready to travel off to a potential difference. Before doing this little experiment, I would have assumed that there would be a current flow from the negative of one power supply to either the positive OR the ground of the other. There isn't. Apparently my understanding of the physics here is extremely flawed. What the heck is going on? My horrific list of questions I don't know how to answer: Why do I measure almost zero potential difference between the two power supplies? Why does it oscillated on a DC system? Why am I measuring a potential difference between the two positives or the two negatives? Why is that potential difference the same magnitude as the potential difference I measure between - and positive? Why do I measure a potential difference between BOTH positive and ground AND negative and ground? This has been bothering me for about a week and I have discussed it at length with two electrical engineers neither of which could give me a good explanation. So thanks for putting up with my rant and thanks for the help ahead of time :) Note: This could probably be classified just as easily as an engineering question and it may have an engineering answer that I am not aware of, but I feel it's important to note that it's the physics I am particularly interested in. [link] [comments]  |
| Why is it so difficult to span large bodies of water? Posted: 06 Apr 2017 04:57 AM PDT For example I was reading about the troubles with bridging huge fjords in Norway and I was thinking: "Why can't we just build floating bridges?" Surely its difficult, but not impossible with modern technologies. But, I realize I don't know anything about modern structural technologies. So, my question is: "What technologies do we have for bridging long spans of water and for technologies we do have, why is it so hard to extend it to super large spans?" Thanks. [link] [comments]  |
| Posted: 05 Apr 2017 10:06 PM PDT |
| Is there a (theoretical) superconductor for heat instead of electricitiy? Posted: 05 Apr 2017 11:53 PM PDT |
| What is the difference between sodium permeability and -conductance? Posted: 06 Apr 2017 06:36 AM PDT Reading on how action potentials are generated in the brain, I've come across a distinction I don't quite understand, namely the one between Na+ conductance and Na+ permeability. My textbook says, "the difference [between the two] is the electrochemical driving force acting upon the ion." Can someone please ELI15? [link] [comments]  |
| Posted: 06 Apr 2017 06:27 AM PDT |
| Posted: 06 Apr 2017 12:20 AM PDT |
| Are all tetrahedral molecules non polar? Posted: 06 Apr 2017 06:11 AM PDT I sort of understand how dipoles work, but the vectors are confusing me. Are all linear, trigonal planar and tetrahedral molecules non polar? Also, are all bent and trigonal pyramidal molecules polar? Thank you! [link] [comments]  |
| CD-R says it can hold 700mb and has 80 minutes of play time. Why can I burn 7 hours of songs on it? Posted: 05 Apr 2017 10:38 PM PDT I searched but did not find anything sepcificaly helpful. Can someone explain how this works? [link] [comments]  |
| What is the total amount of all gravitational potential energy in the observable universe? Posted: 05 Apr 2017 11:36 PM PDT |
| Posted: 05 Apr 2017 06:45 PM PDT I understand that each half of the brain contains roughly 50 billion Neurons, and each neuron has between 10,000-15,000 neural synapse connections to other neurons for a total of 5,000 Trillion neural synapse connections in each half of the brain, while the part of the brain (Corpus Callosum) that connects the two halves and feeds information back and forth only has 150-250 million fibers in it. Is this in effect a stovepipe for information that is not capable of transferring the vast amount of information back and forth between the two brain halves? Would beefing up the Corups Callosum with more fibers increase the amount of information that could be transmitted back and forth between the two halves of the brain? [link] [comments]  |
| Have there been any big updates since the Higgs boson was discovered? Posted: 05 Apr 2017 08:55 AM PDT Searching "higgs boson update" on google gives an April fools article from 2016 as the top result. Have there been any updates on the Higgs boson since it was discovered? Was it confirmed to be the Higgs boson that was originally predicted, or did it turn out to be some other Higgs-like particle? Have the initial measurements been refined? [link] [comments]  |
| Why does liquid form a parabolic shape when spun in a container? Posted: 05 Apr 2017 04:28 PM PDT I just watched a PBS Space Time video (so I guess the source is credible) in which the guy mentions a liquid mirror made of mercury that does 6-8 revolutions a minute and thus creates a parabolic mirror to focus light. Does this happen to all liquids in a container? If I'm spinning my wine in a glass does it always want to take up a parabolic profile? [link] [comments]  |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
No comments:
Post a Comment