Without friction, would a ball still spin when going down a slope? |
- Without friction, would a ball still spin when going down a slope?
- Do tree squirrels live together as mating pairs in a nest?
- Can someone answer an astrophysics question for my uncle?
- Is it possible to forge different metals together?
- How do nocturnal animals produce vitimin D without sunlight?
- Is the use of base 10 arbitrary or are we predisposed to feel that it is the most natural to use?
- Why does my absinthe suddenly 'louche' at a certain concentration? What makes that concentration critical to the effect?
- Why do rate of reaction principles still occur in non-chemical acts, such as stirring tea in hot water?
- How did meiosis gain the ability to pair homologous chromosomes and then undergo synapsis?
- C14 dating. What would happen if you dated a sample 75 million years old, far outside what C14 would consider useful?
- Why do SNRIs (anti-depressants) help to treat Anxiety even though it causes more norepinefrin (a stress hormone activated in increase anxiety) to be retained in the brain?
- Can there be such a thing as an antimatter black hole?
- How common is it for animals to starve to death in the wild?
- How different are cat's taste bud's from human's?
- If the expansion of the universe was accelerating, wouldn't that violate conservation of mass/energy?
- What would gyroscopic precession look like in a frictionless surface?
- When two atoms bond, do they still have the same properties?
- Does hot water have energy (than cold)? If so, is it a good option to drink hot water when there's nothing to eat?
- Does the location of a pipe outlet in a full dam affect the water pressure in the pipe?
- Now that the 7th Row is complete on the periodic table, will there be elements in the 8th and 9th rows separated from the rest of the elements, like the lanthanides and actinides are now?
- Why does the Right of Ascension node change most on the equatorial plane?
| Without friction, would a ball still spin when going down a slope? Posted: 06 Jan 2016 04:45 PM PST Or would it just slide down the slope, without spinning? [link] [460 comments]  |
| Do tree squirrels live together as mating pairs in a nest? Posted: 06 Jan 2016 12:07 PM PST There's a hole in the tree outside my office window and every day I see 2 gray squirrels go in and out. Are they mates, or parent and child? I'm curious about my little friends! [link] [8 comments]  |
| Can someone answer an astrophysics question for my uncle? Posted: 07 Jan 2016 06:19 AM PST "Astrophysics question: If a planet was positionally locked with a "moon" almost as big as itself and the two rotated around a point in space between the two (a barycenter), what would the resulting effect be on the course of the Sun's arc across the sky if you were observing it from the surface of either? Pluto & Charon do this by the way. Also, is it possible for planets or moons that do not rotate independently to maintain a magnetic field? Would the orbit of the two planetary bodies around one another create a field of it's own?" I have no idea why he wants to know, but any help is appreciated! [link] [2 comments]  |
| Is it possible to forge different metals together? Posted: 07 Jan 2016 04:28 AM PST I recently had the idea of creating a ring out of different layeres of different metals like gold, platinum, or titanium. Could you actually layer some metal plates and then forge them e.g. like damask steel? And does anybody know a subreddit about forging or similar topics? [link] [4 comments]  |
| How do nocturnal animals produce vitimin D without sunlight? Posted: 07 Jan 2016 01:11 AM PST |
| Is the use of base 10 arbitrary or are we predisposed to feel that it is the most natural to use? Posted: 06 Jan 2016 11:21 AM PST |
| Posted: 06 Jan 2016 09:51 PM PST |
| Posted: 07 Jan 2016 02:37 AM PST |
| How did meiosis gain the ability to pair homologous chromosomes and then undergo synapsis? Posted: 06 Jan 2016 08:30 PM PST Basically I am asking how meiosis evolved. The reason I worded it was because a previous post of this nature had 0 comments. The theory that is mostly accepted is that it came from Mitosis. If it could be explained with this in mind it would be greatly appreciated. [link] [4 comments]  |
| Posted: 07 Jan 2016 01:45 AM PST Basically, according to some, soft tissue found in dinosaur bones should be carbon dated. The answer to that, to me, seems pretty simple: dating something that old is likely to result in noise, and when you measure noise, you could have the measurement tell you anything.. it could say 40k years old, or it could say something else. Is this the correct way of looking at the problem? What would AMS return if we did put a 75 million year old sample in it? [link] [1 comment]  |
| Posted: 06 Jan 2016 08:46 PM PST |
| Can there be such a thing as an antimatter black hole? Posted: 06 Jan 2016 11:29 PM PST Would there be any discernable difference between a black hole made of regular matter? If so, what would happen if a black hole and an antimatter black hole collide? [link] [3 comments]  |
| How common is it for animals to starve to death in the wild? Posted: 07 Jan 2016 01:33 AM PST I've always wondered if it's a common thing or not. As in they starve simply because they failed to find food not because of human involvement [link] [3 comments]  |
| How different are cat's taste bud's from human's? Posted: 06 Jan 2016 07:14 PM PST |
| Posted: 07 Jan 2016 04:34 AM PST An astrophysicist told me it was invented to explain the attenuation of light from the distant past. There is some other explanation, and several have been proposed. You don't invent a new force of nature (dark energy) that's incompatible with what you already know just to explain something new. That's what medieval people did. That's where religions come from. You say. "I don't know why we observe this," then look more deeply into it. [link] [4 comments]  |
| What would gyroscopic precession look like in a frictionless surface? Posted: 06 Jan 2016 07:51 PM PST I have a physics degree, but mechanics was never my strong point. I understand the basics of how a torque applied to a spinning object with an angular momentum vector, such as a gyroscope, leads to another angular momentum vector which vectorally adds to the first and causes the precession motion. My question is if you had the classic gyroscope mounted on a bar setup, but the base was located in a frictionless surface (such that the base can only apply a force in the z-direction normal to the surface), would the gyroscope-base system co-rotate around the center of mass? Or, would the base still remain stationary? Put another way, is the translational circular motion in the x- and y-directions inherent in the process of a precessing gyroscope or does it arise from frictional forces pushing on the base. [link] [5 comments]  |
| When two atoms bond, do they still have the same properties? Posted: 06 Jan 2016 09:24 PM PST This question has been bothering me for years and I have never got a definite answer. My question is that if two atoms bond, will they still have similar properties as before? For theoretical purposes, let's say we bond one nitrogen atom and one oxygen atom so we have NO. Will the properties of the resulting combination be a little of nitrogen and a little of oxygen, or will it completely change? I hope yall can understand what I am asking! [link] [7 comments]  |
| Posted: 06 Jan 2016 09:17 PM PST |
| Does the location of a pipe outlet in a full dam affect the water pressure in the pipe? Posted: 06 Jan 2016 08:38 PM PST We have a small dam which is used to feed a pipe running down the section to provide water for gardening and other uses. Intuitively, I feel that putting the outlet to this pipe at the bottom of the dam (i.e. as far underwater as possible) would create the highest amount of pressure due to the added weight of the water above. Another person believes that it shouldn't matter if the pipe reaches nearly the surface (as long as the pipe is fully submerged), since the head remains the same and so the pressure is constant. Who is correct? [link] [4 comments]  |
| Posted: 06 Jan 2016 10:09 PM PST |
| Why does the Right of Ascension node change most on the equatorial plane? Posted: 06 Jan 2016 08:35 AM PST I get that the Earth is oblate thus orbits aren't perfect and change, but what I don't get is why the Ascending node changes most (for a satellite orbit) when that orbit is near the equatorial plane? Rather than say 90 degrees where it doesn't change. I'm doing some past papers and although I get the maths behind it. I realised I don't actually get why it does this. Because I'd thought it would be the opposite way around as the Earth's radius should be more constant at 0 inclination. Thanks! ----------------------------------------------------------------EDIT------------------------------------------------------------------ First of I named the the title wrong it should be just Ascension node and not Right of Ascension. To clear up what I'm specifically referring to is nodal precession and why that precession rate is greater when the orbit is at zero inclination. [link] [4 comments]  |
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