Does light that barely escapes the gravitational field of a black hole have decreased wave length meaning different color? |
- Does light that barely escapes the gravitational field of a black hole have decreased wave length meaning different color?
- Why does eyebrow hair grow back when it's been shaved but stay at the same length otherwise?
- Why do the mid-ocean ridges in this global seafloor map have horizontal lines running across them for basically their whole length?
- Will ions across a membrane prefer to equalize concentration over equalizing charge?
- Do the same areas of the brain 'light up' when we read a book versus listening to it?
- Why is the L3 Lagrangian point unstable? How is it any different than the location of the smaller celestial body?
- Why are plankton such a large portion of the biomass in the ocean but not in freshwater ecosystems?
- In quantum mechanics is the Hamiltonian always equal to the total energy?
- What is the math behind the microgravity on the ISS?
- Could you apply enough pressure to water that it wouldn't move?
- How can we differentiate fossils of species that are in the same evolutionary lineage?
- Why do lower frequency radio waves travel further in air?
- Why do I get 'car sick' when reading a book in a moving car?
- What is the most accepted explanation on the state of the universe before the four fundamental forces split?
- If low orbit like ISS' is enough to experience zero G, does it mean the gravity we experience on Earth is mostly due to the mass of the crust directly beneath us?
- What is the physical process behind nuclear receptor down regulation?
- Is it possible to integrate by parts with more than 2 parts, and if not why not?
- Question about the effects of FTL on human body ?
- Can the most acidic substance, fluoroantimonic acid, destroy prions?
| Posted: 05 Mar 2016 04:08 AM PST |
| Why does eyebrow hair grow back when it's been shaved but stay at the same length otherwise? Posted: 05 Mar 2016 06:21 AM PST Extensions: if eyebrow hair continues to grow then why at a slower rate? Does hair being cut accelerate hair growth anywhere else on the body? Thanks! [link] [comments]  |
| Posted: 04 Mar 2016 01:22 PM PST Here is the map in question. I'm just trying to make sense of what I'm seeing here. I understand that these ridges represent boundaries between major tectonic plates, but I don't understand why they seem to be "hashed" all the way along their lengths with perpendicular lines hundreds of miles long. What would cause this? [link] [comments]  |
| Will ions across a membrane prefer to equalize concentration over equalizing charge? Posted: 05 Mar 2016 05:21 AM PST Let's say that a container of water starts with six 1- ions on the left side and six 1+ ions on the right side. There's a membrane in the middle that only allows the positive ions to move through it passively (if such a membrane can exist). At equilibrium, will there be three positive ions on each side, equalizing concentration, or will all six positive ions move over to the left side to neutralize the charge separation? Edit: Clarification [link] [comments]  |
| Do the same areas of the brain 'light up' when we read a book versus listening to it? Posted: 04 Mar 2016 10:23 AM PST Inspired by this post made by /u/b1rd from /r/Comics. I also have a follow up question: How does listening versus reading pertain to the permeance of memory. I understand that we all learn differently, but what I'm more interested is the 'storage of the data' (and I guess accessing the data too). [link] [comments]  |
| Posted: 04 Mar 2016 12:28 PM PST Surely the force of gravity acting on a an object in the Sun-Earth L3 would be completely dominated by the Sun and the earth would be almost "invisible." What am I missing here? [link] [comments]  |
| Why are plankton such a large portion of the biomass in the ocean but not in freshwater ecosystems? Posted: 05 Mar 2016 12:08 AM PST I can't imagine the salinity would make such a big difference to the survival of plankton. Yet plankton and filter feeding organisms that eat them are abundant in the ocean and barely present in freshwater systems. Why is that? [link] [comments]  |
| In quantum mechanics is the Hamiltonian always equal to the total energy? Posted: 04 Mar 2016 02:12 PM PST From classical mechanics, we know that the Hamiltonian is the total energy of the system if the following conditions hold (taken from Thornton and Marion 5th ed p.261):
Are there similar restrictions in place for quantum mechanics? [link] [comments]  |
| What is the math behind the microgravity on the ISS? Posted: 04 Mar 2016 07:27 PM PST I've read that the reason astronauts are weightless on the ISS is because the centrifugal force is equal to gravity. Can anyone do the math to back this up? [link] [comments]  |
| Could you apply enough pressure to water that it wouldn't move? Posted: 04 Mar 2016 10:04 AM PST So I'm probably mixing up different concepts but here's my train of thought: If you fill a bottle half-full with sand and shake the bottle the sand shakes. However, if you press down on the top of the sand and keep pressing while you shake the bottle, none of the sand will move separately. All the grains of sand will move as one. If you were to somehow apply enough pressure to the surface of water, or any liquid, could you achieve the same effect? [link] [comments]  |
| How can we differentiate fossils of species that are in the same evolutionary lineage? Posted: 04 Mar 2016 12:29 PM PST If the features that differentiate Species B from Species A formed gradually over 200,000 years, what happens to all the in-between specimens, and how are they classified into group A or group B? Is it a question of which category they best fit into, or is it more clear-cut? [link] [comments]  |
| Why do lower frequency radio waves travel further in air? Posted: 04 Mar 2016 01:57 PM PST I read somewhere that it's because of attenuation and diffraction but I'm not sure how that works. I'm talking about radio waves sent by WiFi and things like that and not AM waves sent over huge distances. [link] [comments]  |
| Why do I get 'car sick' when reading a book in a moving car? Posted: 04 Mar 2016 09:45 AM PST |
| Posted: 04 Mar 2016 06:11 PM PST Since it occurred at 10-9 seconds, I'm aware that we have no observational evidence (yet.) But what is the most logical and accepted explanation of the universe before the four forces (gravity, strong nuclear force, weak nuclear force and electromagnetic force) "split" and the natural laws came to be? [link] [comments]  |
| Posted: 05 Mar 2016 02:04 AM PST |
| What is the physical process behind nuclear receptor down regulation? Posted: 04 Mar 2016 10:18 AM PST Wikipedia gives the following paragraph on the process on receptor down regulation: The process of down regulation occurs when there are elevated levels of the hormone insulin in the blood. When insulin binds to its receptors on the surface of a cell, the hormone receptor complex undergoes endocytosis and is subsequently attacked by intracellular lysosomal enzymes. The internalization of the insulin molecules provides a pathway for degradation of the hormone as well as for regulation of the number of sites that are available for binding on the cell surface. At high plasma concentrations, the number of surface receptors for insulin is gradually reduced by the accelerated rate of receptor internalization and degradation brought about by increased hormonal binding. The rate of synthesis of new receptors within the endoplasmic reticulum and their insertion in the plasma membrane do not keep pace with their rate of destruction. Over time, this self-induced loss of target cell receptors for insulin reduces the target cell's sensitivity to the elevated hormone concentration. The process of decreasing the number of receptor sites is virtually the same for all hormones; it varies only in the receptor hormone complex. I find it confusing in several ways. For starters, .How does this work for a nuclear receptor? They exist in the cytoplasm. The above paragraph makes it sounds like enzymes int he cytoplasm are what degrades receptor hormone complexes. If that's the case, wouldn't nuclear receptors always be degrading? .It vaguely mentions a "path for regulation." How does this work? I know increased levels of, say, estrogen would cause a cell to down regulate estrogen receptors. But HOW? .It mentions how the rate of synthesis of receptors cannot keep up with their rate of degradation. Again, how does this work for nuclear receptors, and why does this result in a decreased level of transcription for whatever the receptor hormone complex binds to in the DNA? Surely, if there are so many complexes that the body is degrading the hell out of them and cannot replace them fast enough, there must be a maximum number working on the DNA. Even if there is a decreased concentration of receptors in the cytoplasm as a result, shouldn't the cell be cranking out whatever they code for at maximum capacity? .It says over time the cell has reduced sensitivity to whatever ligand the receptor attached to. Again, how? I get that there are less receptors (I still don't understand how this happens specifically) but the instant everything inside the cell gets to normal, the receptors should up regulate and maintain homeostasis. How are they permanently desensitized? [link] [comments]  |
| Is it possible to integrate by parts with more than 2 parts, and if not why not? Posted: 04 Mar 2016 07:34 AM PST |
| Question about the effects of FTL on human body ? Posted: 04 Mar 2016 09:27 AM PST Let's assume that a manned space ship is traveling toward a star located 1500 light years away with a speed of 0.99C. Will time dilation limit the ability of the crew to be able to perform regular activities on on the ship such as eating food and exercising ? [link] [comments]  |
| Can the most acidic substance, fluoroantimonic acid, destroy prions? Posted: 04 Mar 2016 01:11 AM PST I read that prions are very dangerous and very difficult to destroy. Even extreme temperatures don't affect them. Last I read that the only way to neutralize prions is to submerge them in bleach while at a certain pressure point. How about fluoroantimonic acid? Can it destroy prions? [link] [comments]  |
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