- If you run around a track twice, the first time slowly, the second time much faster so that the average for the two laps is twice the speed of the first lap. People are getting infinite speed for the second lap. Why?
- Do all planets have a molten core? Why?
- What is the difference between the Fourier series and the Fourier transform?
- An alpha particle is essentially a helium nucleus; so if free electrons encountered an alpha particle, would they bond and just become helium?
- How can you derive that bound quantum systems only have discrete energies by using fundamental assumptions?
- trapping a floating sphere under a stream of water
- Can tattooed skin be used for a skin graft?
- Why do we like the taste of some foods but not others?
- If two free quarks were isolated from each other at a distance, would the strong force attract them to each other?
- Why do the half lives of unstable isotopes have this distribution?
- How do chip credit cards protect against static discharge?
- is square root of negative one greater than zero?
- Do antiparticles have the same half-lives as their matter counterparts?
- If deleted data can be retrieved, why can't we have our things in deleted state and keep much more space on hard drive disks ?
- Why does scattering of light increase our visibility of it?
| Posted: 12 Apr 2017 11:42 PM PDT This question pops up in Veritasium's new video. People are getting infinite speed for the answer. If you run the first lap at 6 km/h and then the second lap at 18 km/h you get an average of 12 km/h. That average is 2v1 . How is this not correct? You can also check people's answers here and the third answer to a Youtube comment here. There are also multiple answer videos that say the same thing. Help me not be confused. [link] [comments]  |
| Do all planets have a molten core? Why? Posted: 12 Apr 2017 06:34 PM PDT |
| What is the difference between the Fourier series and the Fourier transform? Posted: 12 Apr 2017 09:26 PM PDT |
| Posted: 12 Apr 2017 02:58 PM PDT Question is self-explanatory, I think. When unstable elements decay, they can release alpha particles, which are two neutrons and two protons; a helium nucleus. My question is would this ionizing particle become helium if it met free electrons? [link] [comments]  |
| Posted: 12 Apr 2017 08:28 PM PDT I tried to do it by using the uncertainty principle but got stuck. If you are interested, here is what did: I saw that the collapse of the wave function that is induced by the measurement of, for example x, has a standard deviation of zero, therefore the standard deviation of the other parameter p must go to infinity. (bad math, i know) I then checked whether the standard deviation of a sine is infinite (yes) and was only left with having to show that this is the only possible solution. However the sum of two sines als seems to be a possible solution, since that also has an infinite standard deviation. So that is a problem. Then I realised that the fourier transformation of the collapsed wave function (dirac impulse) is not a sine, but a constant and my whole argumentation went up in smoke... [link] [comments]  |
| trapping a floating sphere under a stream of water Posted: 12 Apr 2017 02:45 PM PDT During bathtime with my infant, I've discovered that if I pour a stream of water over a floating ball, the ball is trapped under the sphere; not only this, but if I move the stream slowly, the ball follows along as though it were pulled by the stream (but of course it isn't). I have a vague intuition as to what is happening (the ball is pushed down into the water by the stream, and the water pushes back upwards and inwards towards the ball because of its shape - when the stream moves, it pushes the ball down and away - but the water pushes it back in the opposite direction), but I'm not sure. Need official explanation please! thanks [link] [comments]  |
| Can tattooed skin be used for a skin graft? Posted: 12 Apr 2017 12:47 PM PDT My own (admittedly rookie) research turned up no information. Could a section of tattooed skin be taken from a donor and grafted onto someone else like a normal skin graft? Would the ink provoke additional immune response or increase the risk of rejection? [link] [comments]  |
| Why do we like the taste of some foods but not others? Posted: 12 Apr 2017 09:53 AM PDT |
| Posted: 12 Apr 2017 10:31 AM PDT I understand that the strong force holds quarks together, and if they are pulled apart the potential energy is enough to create two new quarks to bind to the existing quarks, so free quarks cannot be created in this manner. It is commonly said that the strong force only acts over short distances. If two strong force sensitive particles are far away from each other, do they still interact through the strong force at all? Does the strong force really only act at short distances, or is there just no way for us to observe it acting over long distances? Do bound quarks interact with other groups of bound quarks at all through the strong force? [link] [comments]  |
| Why do the half lives of unstable isotopes have this distribution? Posted: 12 Apr 2017 09:05 AM PDT So, I recently plotted the distribution for the half lives of all the decays listed in a table of nulcides data file that I found online. (See my post on /r/dataisbeautiful ). I was really surprised to see that the data was distributed so nicely, with two well defined peaks. It looks like half lives are (at least to a first approximation) log-normally distributed, but I don't know why that would be. Can anyone help me understand the explanation behind this? [link] [comments]  |
| How do chip credit cards protect against static discharge? Posted: 12 Apr 2017 09:21 PM PDT |
| is square root of negative one greater than zero? Posted: 12 Apr 2017 01:34 PM PDT |
| Do antiparticles have the same half-lives as their matter counterparts? Posted: 12 Apr 2017 06:58 AM PDT |
| Posted: 12 Apr 2017 04:33 PM PDT |
| Why does scattering of light increase our visibility of it? Posted: 12 Apr 2017 10:35 AM PDT Sorry if the title doesn't make sense but I've been reading about why the sky is blue. I understand the fibrous concepts of scattering and what not but my question is this: If blue light is scattered the most, then wouldn't the blue light needed to observe the color be scattered and not make it to our eye? If all the other colors go "straight to our eyes" from the sky except blue, wouldn't we see white light minus the blue scattered spectrum? [link] [comments]  |
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