What % of my weight am I actually lifting when doing a push-up? |
- What % of my weight am I actually lifting when doing a push-up?
- Is there a schwarzschild radius for an object to become a star?
- What is the advantage of having a dog leg transmission. Why do both racing cars and sometimes trucks use that system? What is the common advantage?
- Why is "maximum torque" a measurement of engines? Can't you get an arbitrary high torque by using a bigger gear difference?
- What do atoms really look like?
- A flat-earth advocating website says the sun is 32 miles in diameter and 3000 miles above the surface. Is it plausible for a 32 mile sphere to generate that much light, and would it be too hot for life on this planet?
- What is the relationship between information and thermodynamic entropy?
- How much/does the caloric content of food change with cooking?
- [Math] What is the size of a differential?
- Why are alpha, beta and L and K iron spectral lines so important in understanding black holes? Is there any special information gained from analyzing these lines as opposed to any other?
- How could Schrodinger know that he could only predict the probability of where an electron is in 1926 if Heisenberg's uncertainty principle wasn't discovered until 1927?
- What is the actual theoretical energy output of the ITER?
- Does a boat going over and underwater tunnel put more stress on the tunnel?
- Is there any possible relation between the imbalance of matter/anti-matter and cold spots on the cosmic background radiation?
- Do the molten and aqueous forms of a compound conduct the same amount of electricity or differing amounts?
- Why are BRCA1 mutations so highly linked to breast cancer compared to other types of cancers, when BRCA1 is expressed in many different tissues (not just breast tissues)?
- Are there any other elements besides carbon capable of forming the bonds needed for complex life?
- How do we perceive objects to have subtly different colors in different lighting (sunlight, fluorescent, etc.)? Is it our eyes that adjust the color or does the lighting determine this?
- Why do heavier elements need more pressure and temperature to fuse than lighter elements?
| What % of my weight am I actually lifting when doing a push-up? Posted: 26 Oct 2017 11:25 AM PDT |
| Is there a schwarzschild radius for an object to become a star? Posted: 27 Oct 2017 05:10 AM PDT |
| Posted: 27 Oct 2017 02:57 AM PDT |
| Posted: 26 Oct 2017 10:48 PM PDT By the "lever principle", increasing distance allows the same force to be applied with less power. If you had a really high difference between high and low gears (or use several sets of high/low gears to further multiply the difference), could you apply progressively more power to the wheels, achieving a higher torque (of course, at the price of moving slower)? [link] [comments]  |
| What do atoms really look like? Posted: 27 Oct 2017 01:20 AM PDT In school we're always shown the same diagram of the atom with the nucleus in the centre and electrons orbiting around it. From my understanding they don't actually look like this and it's just a simplified representation of what an atom looks like [link] [comments]  |
| Posted: 26 Oct 2017 11:16 PM PDT |
| What is the relationship between information and thermodynamic entropy? Posted: 26 Oct 2017 07:01 PM PDT I know they are extremely related, but it doesn't make intuitive sense (to me) how. I've also heard somewhere that infinite information is actually complete randomness and therefore infinite entropy, which doesn't make sense to me. Isn't randomness the opposite of information? [link] [comments]  |
| How much/does the caloric content of food change with cooking? Posted: 26 Oct 2017 10:07 AM PDT It seems like it should, since heat is involved, even if it might not be an appreciable amount (until you get to mass amounts of food). [link] [comments]  |
| [Math] What is the size of a differential? Posted: 26 Oct 2017 06:21 PM PDT I've done differential and integral calculus, and the question is bugging me more and more. Something doesn't seem right to me, especially in integral calculus. The width of the Riemann Sums is dx, and dx was taught to me as "infinitely small". And to me, infinitely small is just 0. And summing 0's even for the time left in all universes won't do anything. What is wrong here? Are our minds ( or just mine -.- ) just too stupid to grasp the concept of differentials and infinity? What would be the decimal representation of a dx? Not 1, not 0.1 and clearly not 0. I feel as if I were playing with magic. Edit: I forgot how to write. [link] [comments]  |
| Posted: 27 Oct 2017 01:20 AM PDT I'm an undergraduate junior who's planning on pursuing higher level astrophysics research, and I see that nearly all analytical papers looking at black holes use iron spectral data, and just wanted to understand it more thoroughly. [link] [comments]  |
| Posted: 26 Oct 2017 02:46 PM PDT One of my middle schoolers asked me this. I am surprised and I also can't figure it out. I think I am thinking too hard. [link] [comments]  |
| What is the actual theoretical energy output of the ITER? Posted: 26 Oct 2017 11:25 AM PDT In their website they have mentioned the experimental reactor will produce 10 times the energy it is given. Now the energy given i assume is the energy for heating the plasma. Then what about the whole reactor energy consumption. Considering that, what will be actual output power with respect to the power consumed by the whole reactor. [link] [comments]  |
| Does a boat going over and underwater tunnel put more stress on the tunnel? Posted: 26 Oct 2017 03:45 PM PDT Probably a stupid question. But the more you know ! Right? Got stuck in traffic in an underwater tunnel that large vessels go over regularly. While the vessels obviously don't make contact with the tunnel is there more pressure when they are traveling overhead? [link] [comments]  |
| Posted: 26 Oct 2017 03:41 PM PDT This article about matter dominating over anti-matter combined with this article about the possibility of the cold spot being from bumping into another universe got me wondering. Could this "bump" have had some kind of transfer of matter/anti-matter between two or more universes, causing the imbalance? Does/could the universe that got bumped have more anti-matter? [link] [comments]  |
| Posted: 26 Oct 2017 07:16 PM PDT Take for example molten NaCl and aqueous NaCl. Does one conduct more electricity than the other? [link] [comments]  |
| Posted: 26 Oct 2017 06:15 AM PDT I am teaching a biology lab to non-majors and we talking about cancer next, and this is a question that I have wondered about and I want to be able to explain it to my students. [link] [comments]  |
| Are there any other elements besides carbon capable of forming the bonds needed for complex life? Posted: 26 Oct 2017 10:43 AM PDT If not, then if we ever came across intelligent life could we safely assume it'll be carbon based and have undergone evolutionary pressures similar to what our ancestors would have faced and be biologically understandable? [link] [comments]  |
| Posted: 26 Oct 2017 08:44 AM PDT |
| Why do heavier elements need more pressure and temperature to fuse than lighter elements? Posted: 26 Oct 2017 09:23 AM PDT |
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