If there was a tank that could hold 10000 tons of water and had a finger - width hole at the bottom and you put your finger on/in the hole, would the water not drain or push your finger out? |
- If there was a tank that could hold 10000 tons of water and had a finger - width hole at the bottom and you put your finger on/in the hole, would the water not drain or push your finger out?
- How much blood can a human body receive from a donor in one go. Can excessive blood cause the veins and arteries to burst due to the buildup of pressure?
- Is Ohm's law still valid if the Electric field isn't uniform through a conductor? Is it possible to prove that vector and scalar form of Ohm's law are equivalent with this condition? How?
- How long can viruses survive on a p95 mask or filter?
- Why is the size of noble gases larger than the previous halogen?
- How do our bodies produce electricity with electrolytes? What are these electrolyte cells made out of? When the iron gates of these electrolytes open, to flip the charge inside and outside the cell, how does it make sure the wrong charge doesn't go to the wrong place?
- Why are the craters on the moon so shallow and flat?
- If I point a laser at the moon and quickly flick my wrist, will the red dot of light on the moon move faster than the speed of light?
- Can viruses evolve to become resistant to vaccines?
- Were there ever more than 9 planets?
- Why is absorption spectra of a molecule bell curved?
- Why is potassium needed to create an action potential in nerve cells?
- Why are angular momentum and each of the linear momentums (in the x,y, and z directions) all conserved independently?
- How do quantum computers use amplitudes to find a definite solution?
- How to Salmon survive in both freshwater and saltwater?
- What is quintessence?
- Since our stomach acid is a strong acid, when we drink water does it react with that acid and form H3O+ in our stomachs?
- Why does your skin secrete electrolytes when sweating?
- If Betelgeuse is dimming and is 650 light years from earth is it possible it's already went supernova?
- How do genes build bodies?
- Is mRNA stored in our cells? Do we have a reserve if lets say RNA polymerase II stops working?
- Does the degree of polyploidy in plants have anything to do with the intensity of solar radiation they receive?
| Posted: 22 Feb 2020 12:52 PM PST |
| Posted: 22 Feb 2020 08:12 PM PST For example, a balloon can pop if it's over inflated, can this happen inside the veins and arteries? [link] [comments]  |
| Posted: 23 Feb 2020 07:03 AM PST As this website and other textbooks shows, to pass from the microscopic to macroscopic version of Ohm's law, these assumptions are made: • E=∆V/L which is only true if the field through the conductor is uniform. • J=I/A that due to its definition implies that the direction of the drift speed of electrons is the same as the normal vector of the conductor's surface. But this can't be true considering we are assuming pJ=E and E, since the conductor isn't in electrostatic equilibrium anymore, is the field inside of the conductor generated by the current. So it makes sense for me that E can be considered uniform because is almost always tangencial to the path, but then again, the direction of J and E can't be the same to make these 2 assumption simultaneously, am I right? What am I missing in this analysis? Also, I couldn't find anything mathematically rigorous on this particular issue, like how is it possible that we can have a vector and scalar form of Ohm's law that are equivalent? Is the law actually the module of J and E or why is the vector form which is correct? [link] [comments]  |
| How long can viruses survive on a p95 mask or filter? Posted: 22 Feb 2020 10:53 PM PST |
| Why is the size of noble gases larger than the previous halogen? Posted: 23 Feb 2020 01:46 AM PST |
| Posted: 22 Feb 2020 07:07 PM PST The question is all in the title. I've googled these things extensively and i can't find anything. I am grade 9 for context, just in case these questions are retarded. [link] [comments]  |
| Why are the craters on the moon so shallow and flat? Posted: 22 Feb 2020 08:56 PM PST From pictures I have seen online, many of the craters on the moon are perfectly circular, 10s of km in diameter but very shallow and perfectly flat. Shouldn't craters caused by asteroid impacts be deeper? The moon also has no atmosphere/water, so no erosion. Without erosion how could the craters be so flat? [link] [comments]  |
| Posted: 22 Feb 2020 04:17 PM PST |
| Can viruses evolve to become resistant to vaccines? Posted: 22 Feb 2020 06:42 PM PST With the anti-vaccination movement getting larger and larger by the day, if there comes a day where they overwhelm crowds of vaccinated people, is it possible over time for viruses to evolve to become resistant to vaccinations? I know bacteria have mutant genes that allow them to be resistant to antibiotics, and i'm wondering if that may be something that we'll begin to see in viruses. [link] [comments]  |
| Were there ever more than 9 planets? Posted: 22 Feb 2020 09:22 PM PST Years ago, I recall reading that there were once more celestial bodies classified as planets (12, I think). I believe they were some of the first asteroids discovered in the asteroid belt and were later declassified as planets after more and more of them were found. Much like how Pluto was declassified after more and more celestial bodies were found in the Kuiper Belt, correct? I can't seem to find any info about this. I wanna say this was in the 1920s or 30s. [link] [comments]  |
| Why is absorption spectra of a molecule bell curved? Posted: 22 Feb 2020 11:29 PM PST For a molecule, with a particular lamba max; at that wavelength the absorbance is read to be highest in the spectrophotometer. But I'm interested to know why does the absorbance decrease as we decrease the wavelength( or increase the energy), as the energy gap between HOMO and LUMO can be easily crossed at higher energies. [link] [comments]  |
| Why is potassium needed to create an action potential in nerve cells? Posted: 22 Feb 2020 03:46 PM PST In nerve cells, sodium is actively pumped outside of the axon, while potassium is pumped to the inside. Because more sodium is moved outside than potassium is moved inside, the outside of the axon becomes positively charged relative to the inside, and an action potential is created. This allows the nerve cell to send an impuls along the axon by opening sodium channels and removing the action potential. My question is: why is potassium needed in this situation? You're trying to get an action potential, so pumping positively charged ions to one side of a membrane makes sense. However, sodium and potassium are both positively charges ions, and you're pumping them in opposite directions. Wouldn't it be easier to pump sodium to one side of the membrane, and a negatively charged ion to the other? Or even to only pump sodium to one side of the membrane, and not use potassium at all? [link] [comments]  |
| Posted: 22 Feb 2020 09:59 PM PST |
| How do quantum computers use amplitudes to find a definite solution? Posted: 22 Feb 2020 09:24 PM PST Apologies in advance if this is a stupid question, I'm not the brightest. I recently listened to Scott Aaronson's conversation with Lex Fridman, and an interview he did for Scientific American, regarding quantum computing (QC from now on) and have a question regarding how a QC finds a solution. This is an excerpt from the interview: "In particular, if an event can happen one way with a positive amplitude, and another way with a negative amplitude, those two amplitudes can "interfere destructively" and cancel each other out, so that the event never happens at all. The goal, in quantum computing, is always to choreograph things so that for each wrong answer, some of the paths leading there have positive amplitudes and others have negative amplitudes, so they cancel each other out, while the paths leading to the right answer reinforce."¹ My question(s) is the following: I) When he talks about choreographing amplitudes, is he essentially saying that we take a problem with a vast solution space, of which we know a large subset of true and false solutions, and try to "collapse" the correct wave function by cancelling out what we assume to be false values and reinforcing amplitudes that converge toward the correct answer; then hope the final measurement "collapsed" the correct solutions' wave function? II) If that is the case, do we square the amplitude of that solution, as we do in physics, to get a probability? If so, does that mean we only get a value for the probability of that particular solution being the right one? III) If we have to know so much about the solution in the first place and the challenge is programming an algorithm to get the correct solution, would it be impossible to have novel solutions to problems in which we have no epistemological priors about the possible solution space? Apologies again if this is a silly question and thank you in advance for taking the time to answer it. [link] [comments]  |
| How to Salmon survive in both freshwater and saltwater? Posted: 22 Feb 2020 01:38 PM PST |
| Posted: 22 Feb 2020 06:44 PM PST I was reading about dark energy and I heard of quintessence. I looked it up and most results I got weren't very helpful since they talked about a lot of complicated physics. So I came to ask, what is quintessence and what does it have to do with dark energy? [link] [comments]  |
| Posted: 22 Feb 2020 12:18 PM PST |
| Why does your skin secrete electrolytes when sweating? Posted: 22 Feb 2020 09:48 AM PST |
| Posted: 22 Feb 2020 01:28 PM PST |
| Posted: 22 Feb 2020 08:01 AM PST I understand that during the embryo stage, certain genes are turned on and off to control the building of a body plan. What I don't understand is how these genres "know" when to be turned on when to be turned off? [link] [comments]  |
| Is mRNA stored in our cells? Do we have a reserve if lets say RNA polymerase II stops working? Posted: 22 Feb 2020 11:24 AM PST |
| Posted: 22 Feb 2020 10:50 AM PST |
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