Why does beta plus (β+) decay happen in proton-proton chain reactions; why don't the two protons just form helium instead of deuterium? |
- Why does beta plus (β+) decay happen in proton-proton chain reactions; why don't the two protons just form helium instead of deuterium?
- Is there any medium that sound travels through faster than light can?
- Did the asteroid impact that killed the dinosaurs significantly reduce the air pressure on Earth?
- A picture of a clear blue sky has greater entropy / information content than a busy painting: true, and if so, how?
- Does environment affect personality?
- How is the placebo effect mitigated in experiments studying effect of meditation?
- What is the difference between a magnetar and a millisecond pulsar?
- Why does a gases Mach Number affect whether it’s velocity increases or decreases when entering a convergent or divergent nozzle?
- Some moons are coplanar and some are not, what makes some of these moons non-coplanar?
- Why is mortality from measles in the Philippines so high?
- How do woodpeckers not get concussions from hitting their heads against trees so hard?
- What attribute determines sex?
- Is it possible to split a helium nucleus (or an alpha particle) in half?
- How high do mountains have to be to affect precipitation?
- Why do some wines get better with age, and some wines go bad?
- Why/how does soap clean are skin when we take a shower/wash our hands?
- If, as suspected, the earth was hit by Theia early in its creation, why don’t we have a ring of debris around us like Saturn?
| Posted: 30 Apr 2019 06:26 PM PDT |
| Is there any medium that sound travels through faster than light can? Posted: 30 Apr 2019 10:22 PM PDT I learned recently that a team of scientists (lead by Lene Hau) managed to slow light down as slow as 38 mph using a supercooled medium. I was wondering if there is anything out there that sound can travel through faster than light can. Or would the properties required for such a material make it unable to propagate sound? [link] [comments]  |
| Did the asteroid impact that killed the dinosaurs significantly reduce the air pressure on Earth? Posted: 30 Apr 2019 11:12 PM PDT As i understand it, the impact blasted a significant amount of the atmosphere into space. Would sea level pressure have noticeably decreased, if only for a few hours? [link] [comments]  |
| Posted: 01 May 2019 06:08 AM PDT
So I've attended some lectures on entropy, but not being a physicist and never having to apply the concept, the counterintuitive parts of it always just escape my brain's long-term comprehension. Is this passage correct, and what's the explanation that someone with a PhD in a lowly subject like biology could follow? (I've found this attempt at a discussion, but the top explanation jumps straight to algebra, and none of the others are very fluent. Link also includes the painting in question.) [link] [comments]  |
| Does environment affect personality? Posted: 30 Apr 2019 04:55 PM PDT Let's imagine we have two identical worlds. Two earths. Let's imagine that we place two newborns with identical families with identical traits, one on each earth, in the same town or city. The newborns grow into young adults experiencing and seeing all of the same things as the other. They share the same exact environment. Do they have identical personalities? [link] [comments]  |
| How is the placebo effect mitigated in experiments studying effect of meditation? Posted: 30 Apr 2019 08:25 PM PDT For the studies on effect of drugs, I can easily imagine it being done by some fake pills and stuff. But how are the control groups designed for studying effect of meditation? [link] [comments]  |
| What is the difference between a magnetar and a millisecond pulsar? Posted: 01 May 2019 12:55 AM PDT Are the two interchangeable? Both spin many, many times a second and I assume both have very strong magnetic fields. [link] [comments]  |
| Posted: 30 Apr 2019 10:47 AM PDT I'm looking for an intuitive explanation. The math makes perfect sense to me but I'm trying to get a better feel for why it happens. It must have something to do with whether or not a pressure wave can propagate through the gas, but I can't quite put my finger on why that would make a difference. [link] [comments]  |
| Some moons are coplanar and some are not, what makes some of these moons non-coplanar? Posted: 30 Apr 2019 08:02 PM PDT Is it planetary impact, or gravitation from other nearby moons? Or something else? [link] [comments]  |
| Why is mortality from measles in the Philippines so high? Posted: 30 Apr 2019 02:45 PM PDT Hello. I am not asking why there is an outbreak of measles. I am asking why so many people are dying. This source for the U.S. indicates that the expected mortality rate is one per thousand cases: https://physiciansforinformedconsent.org/measles/dis/ This source indicates that 12,700 cases of measles have been reported, leading to 203 deaths: https://www.who.int/philippines/news/feature-stories/detail/questions-and-answers-on-the-measles-outbreak-in-the-philippines That's one death per 63 cases. That's 150x higher than expected in the U.S. [link] [comments]  |
| How do woodpeckers not get concussions from hitting their heads against trees so hard? Posted: 30 Apr 2019 10:03 PM PDT |
| What attribute determines sex? Posted: 30 Apr 2019 10:03 AM PDT In humans, males are the heterogametic sex (XY) and females are the homogametic sex (XX). But in the the ZW-sex determination system this inverse (ZZ is male and ZW is female). Other sex-determination systems have even different ways of determining sex (XO, ZO system). In humans, females are the sex that get pregnant. However, in some fish males are the ones that get pregnant. In humans, females carry the most care for their child. However, in some species paternal care is more common. Therefore, what attribute makes males males, and females females? If it isn't anything of these, what is it? Edit: I thought I had explained myself pretty well, but seeing the answered I guess my question wasn't clear enough. So here's it formulated differently. This question isn't about humans, it's about classifying different organisms. Obviously there's going to be abornormalities within species that cause differences in sex-outcome, but that shouldn't be included within the scope of this question. Just imagine we lost all data on all species in the world. And we go back to redetermining the sex of all known species. Why would we call the male of the Hippocampus genus (seahorses) males, because the males get pregnant. What attribute made us decide they were the males. Then we look at Varanus komodoensis (Komodo dragons), and want to know which ones are males. We look at their karyotype; the males have the ZZ chromosome pair. What attribute made us decide these were the males? [link] [comments]  |
| Is it possible to split a helium nucleus (or an alpha particle) in half? Posted: 30 Apr 2019 09:20 AM PDT |
| How high do mountains have to be to affect precipitation? Posted: 30 Apr 2019 02:45 PM PDT This one has been bothering me pretty much as long as I've known: Obviously, mountains cause rain shadows by blocking rain, so there's a dry area right next to the ocean. However, where's the limit? For example, is like half a kilometer high enough? [link] [comments]  |
| Why do some wines get better with age, and some wines go bad? Posted: 30 Apr 2019 10:43 AM PDT |
| Why/how does soap clean are skin when we take a shower/wash our hands? Posted: 30 Apr 2019 04:13 PM PDT |
| Posted: 30 Apr 2019 05:12 AM PDT |
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