When you diet and exercise, where does the fat you burn physically go and how? |
- When you diet and exercise, where does the fat you burn physically go and how?
- How is we can detect transverse magnetisation (MRI/NMR) if spin's can only be up or down?
- Parade of low-earth-orbit satellites?
- How do we study about the properties of stars?
- What does data look like physically?
- Can we use particles larger than electrons for microscopy?
- Why are dNTP's used during replication (and not dNMP's)? That is, why would our cells tack on two extra phosphates to a perfectly good nucleotide, if they're just going to get broken off again when the nucleotide joins the growing strand? Do the extra phosphates somehow help facilitate synthesis?
- What's the deal with lightning and the smoke coming from volcanos?
- When two proton beams in a particle accelerator collide, each traveling at 0.99c, does that mean that their collison velocity is superluminar (equal to 1.98c) to the observer?
- Does data have weight? Ex If I were to weigh a USB before and after loading it with data, would there be any difference (no matter how minute)?
- What causes cooking grease to solidify and will vegetable oil still solidify after being fried with any other fat?
- If rain/rivers are constantly carrying salt from rocks into the ocean, how does the ocean not become salty to the point of uninhabitability?
- Why is CO2 sp hybridised?
- Do the planets rotate their stars at the same speed? Is it possible for a planet close to the star, to complete a rotation slower than a planet much further away?
- Why is sweat so salty? Why not conserve that salt?
- How often are planets found?
- How do helicopters glide when their engines cut out?
- What is it that determines what smell a certain thing or being have?
| When you diet and exercise, where does the fat you burn physically go and how? Posted: 16 Jan 2020 06:03 PM PST |
| How is we can detect transverse magnetisation (MRI/NMR) if spin's can only be up or down? Posted: 17 Jan 2020 02:59 AM PST I am reviewing some of my undergraduate notes in preparation for a presentation on MRI. And I'm tripping myself up on this issue (which I guess I didn't question as an undergrad). If we have a proton in a magnetic field B_0 the spin up and down states split into higher and lower energy levels (Zeeman effect). We apply a perpendicular RF pulse and tip the spin (which of course doesn't "physically" happen - well only as much as they aligned in the first place). Really I'm understanding this step as on a Bloch sphere. We change say the state from |0> to 1/sqrt(2) |0> + 1/sqrt(2) |1> (and some phase). But how is it we can detect this? Shouldn't we only be able to pull the observable states out |0> and |1> and get relaxation by photon emission (which shouldn't happen for ages as it's RF emissions). So I can't even say it's just photons + phase or something. I want to reinforce my understand here but I've always moved smoothly to "the RF pulse can be thought to act classically since we have a system of so many protons". Very handwavy which I'd like to atleast feel more confident about. I didn't cover recovering classical magnetism from quantum mechanics as an undergrad and I fear that's where my confusing is coming from. Is the answer somehow in degenerate states of multiple protons? |01>, |10> etc leads to many energy levels and somehow that results in classical magnetism? [link] [comments]  |
| Parade of low-earth-orbit satellites? Posted: 16 Jan 2020 06:58 PM PST About an hour after sunset, my son and I just saw about 30 lights moving across the sky that looked exactly like LEO satellites (we've watched the ISS pass over before, so we know what to look for). These were not airplanes. What was notable was the sheer number — about 30 in groups of 3-5 over about 12 minutes — but even more so, they were all traveling in the exact same line about 40 degrees above the northwestern horizon here at 37 degrees north latitude, in the same direction (~ ENE) at the same speed. What gives? [link] [comments]  |
| How do we study about the properties of stars? Posted: 16 Jan 2020 07:44 PM PST |
| What does data look like physically? Posted: 16 Jan 2020 01:26 PM PST For instance, when I save an MS word document, or save data in a video game, those specific bits of info, what do they look like physically, and how is it stored? How does that work? [link] [comments]  |
| Can we use particles larger than electrons for microscopy? Posted: 16 Jan 2020 09:09 PM PST I've been reading a little about electron microscopy, and was wondering since larger particles have a smaller debroglie wavelength, could they be used for higher resolution? [link] [comments]  |
| Posted: 16 Jan 2020 06:35 PM PST Any help would be appreciated. I'm looking to teach replication during the next unit of AP bio, and I want to shore up my understanding before going live in front of the students. [link] [comments]  |
| What's the deal with lightning and the smoke coming from volcanos? Posted: 16 Jan 2020 04:59 PM PST I keep seeing videos of lightning and the smoke the billowing from the volcano in the Philippines. And it makes me wonder, why? [link] [comments]  |
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| Posted: 16 Jan 2020 06:29 AM PST I can understand that hybridisation is required to form 3 or 4 bonds, but I don't get why sp hybridisation is used here. If they have 2 p sub shells with only 1 electron in each, why does it need to hybridise? Why can't it just bond using the 2 p sub shells? Does sp hybridisation make the molecule more energetically stable? Thanks in advance [link] [comments]  |
| Posted: 16 Jan 2020 07:17 AM PST I doubt that all planets rotate their star at the exact same speed. But I am finding it difficult to imagine a system evolving to a point where a tiny planet, that's as close as say Mercury, would move so slowly, that a giant planet like Neptune, that's much further away, might move fast enough to complete more revolutions, in a given amount of time, than Mercury. It makes me wonder if there are some "limits" to how fast or slow an object based on it's mass and distance from the sun AND the process by which the system evolves (lack of better term?). Ie: a planet rotating at a certain speed close to the sun, moving at that same speed far enough from the sun would cause that planet to escape the sun's gravity. (I think this rule probably exists.) But is it still possible? [link] [comments]  |
| Why is sweat so salty? Why not conserve that salt? Posted: 16 Jan 2020 08:26 AM PST |
| Posted: 15 Jan 2020 11:15 PM PST |
| How do helicopters glide when their engines cut out? Posted: 16 Jan 2020 12:05 AM PST |
| What is it that determines what smell a certain thing or being have? Posted: 16 Jan 2020 02:14 AM PST |
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