How is gender (not sex) biologically structured? Why does gender dysphoria exist? |
- How is gender (not sex) biologically structured? Why does gender dysphoria exist?
- What is the swartszchild radius of a neutron?
- In which situations is the VECTOR of angular momentum conserved, and not just the overall magnitude?
- How would a planet having two suns affect the temperature? Could a planet with two sons be habitable by humans?
- Do matter and antimatter collisions break the rule of law of conservation of mass?
- How come when ice is in my cup, and i rotate the cup, it stays in the same position?
- I eat some of the hottest hot sauces and extracts in the world. Why does my mouth build a tolerance but my stomach doesn't? And why does it hurt more than the stringer acid in my stomach?
- What is the vacuum?
- How does a photon move?
- What do we know about the microbiome of other animals? Do plants have microbiomes?
- When you're sick why do you feel hot and cold at the same time?
- What about a volcanic eruption makes lightening occur?
- If motion is relative, why is it (theoretically) possible for one massive object to move in 0.5c in one direction and for another to move at the same speed in the opposite direction?
- What are the differences in screens that allow me to see my Gameboy Color in direct sunlight but when my laptop is I can't see anything?
- From a photon's frame of reference, are the instances of its generation and its absorption instantaneously one and the same?
- What would be the consequences of growing crystal in different gravitational influence?
- Can animals in the wild get PTSD?
- If 0^0 is one, and 0^(x>0) is zero, can we define the Dirac-Delta function as simply 0^|x|?
- Is consciousness dependent on memory?
- If heat and sound are both vibrations of molecules, what's the thing separating them?
- Do we observe each other as objects or subjects?
| How is gender (not sex) biologically structured? Why does gender dysphoria exist? Posted: 04 Dec 2015 09:31 PM PST |
| What is the swartszchild radius of a neutron? Posted: 04 Dec 2015 11:47 PM PST If you scrunched the mass of Earth to about 1 inch you'd have a black hole. Wolfram Alpha tells me that the swartszchild radius of a neutron is about 2.5 * 10-15 meters. Wikipedia tells me that the radius of an atomic nucleus is about .875 * 10−15 meters, but doesn't give me a radius for a neutron itself. Can a single neutron be compressed to become a black hole? If not, what is the smallest chunk of matter which can be squashed to become a black hole? [link] [6 comments]  |
| In which situations is the VECTOR of angular momentum conserved, and not just the overall magnitude? Posted: 05 Dec 2015 12:01 AM PST A famous experiment shown to students in intro courses to physics involves a person standing on rotating platform holding a rapidly spinning bicycle wheel. The wheel is first parallel with the surface of the platform. The person then turns the wheel over by 180 degrees. The conservation of momentum then causes the entire platform to begin to spin in the same (original) rotational direction of the bike wheel. The explanation for this phenomena is explained as a conservation of the VECTOR of angular momentum -- and not just say the conservation of angular momentum as a scalar quantity or "absolute magnitude". This is the common explanation for why the platform rotates with the original wheel's direction, instead of contrary to it. But is the VECTOR of the angular momentum always conserved? Are there situations in which the overall 'scalar' angular momentum is conserved, but not the VECTOR? To answer these questions, consider the following experiments. Clockwise wheel makes another wheel spin clockwise.Imagine a wheel is spinning clockwise with an angular velocity of 10.0 rad/sec. The wheel has a mass of 1.13 kg and a radius of 0.33 meters. The moment of inertia of the wheel is 0.123. In this initial configuration, the magnitude of the angular momentum is L = I*(w_o) Because the wheel is spinning clockwise, the VECTOR of the angular momentum is L0 = <0 , 0 , I*w_o > Into the "blackboard" as it were. A second wheel, wheel B, of the same mass is brought near the first wheel, wheel A. In the initial config wheelB is not spinning at all, and has an angular velocity of 0.0. The two wheels are brought together as shown in the figure, and allowed to rotate together as a single object of mass (M_A + M_B). The two wheels are later taken apart. As we can see, they are both rotating clockwise, and therefor their VECTORS of angular momentum are both "into the chalkboard". We could add L_B and L_A and see that their vector sum is equal to L0. L_B + L_A = L0 Thus angular momentum is conserved and all is right in the universe. Clockwise wheel makes another wheel spin counter-clockwise.We start with the same condition as before, with a spinning wheel A, and a stationary wheel B. But this time they are besides each other and their edges are gently brought together. Like two gears, their treads collide and they spin in opposite directions. After this goes on for a while, the wheels are separated. This is the final configuration of the system, L_A = <0 , 0 , I*w_A > "into the chalkboard" L_B = <0 , 0 , -I*w_B > "out of the chalkboard" Although the angular momentums are shorter than the original L0 by magnitude, they are now pointing in opposite directions. If we try to add them, they cancel out! Something is amiss. L0 =?? (I * w_A) - (I * w_B ) At this point, you may cry out that, "It is the sheer magnitudes of the angular momentums that are conserved, not their directions." But if that were true, how could you ever explain the phenomenon at the opening of this article? Why does the platform begin to spin underfoot in the same direction of the original rotation of the bike wheel? http://i.imgur.com/QPWvquV.png [link] [3 comments]  |
| Posted: 04 Dec 2015 08:19 AM PST There are planets with two suns, like those in the Kepler-47 system, and how does that affect the overall temperature of a planet. An info graphic I saw listed the "habitable zones" of Kepler-47, what does that mean? (Bonus question : what would that look like sky wise? Would that look similar to Tatooine in Star Wars? Or would be different?) [link] [30 comments]  |
| Do matter and antimatter collisions break the rule of law of conservation of mass? Posted: 05 Dec 2015 12:05 AM PST My understanding is that when matter and antimatter collide, they annihilate each other. Does this mean that the matter is completely removed from existence or is it transformed like how it's defined in the law of conservation? [link] [10 comments]  |
| How come when ice is in my cup, and i rotate the cup, it stays in the same position? Posted: 05 Dec 2015 05:22 AM PST This isn't really a joke post, ive always wondered and its so annoying when the ice is in the back of the cup, you have to put the cup down and walk around it OR put your finger in the cup, which isn't that nice. [link] [3 comments]  |
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| Posted: 04 Dec 2015 11:25 PM PST I'm a 3rd year physics major at university and I've studied some intro quantum mechanics and played with the harmonic oscillator and learned that even the ground state has some energy that we call vacuum energy.. What does that mean? I'm just kinda getting confused with what the vacuum actually is and a way to visually conceptualize the vacuum with the notion that space itself is constantly expanding because of inflation. Any insight would be greatly appreciated [link] [5 comments]  |
| Posted: 04 Dec 2015 09:07 AM PST |
| What do we know about the microbiome of other animals? Do plants have microbiomes? Posted: 04 Dec 2015 11:56 AM PST It seems like I see a new article every week about the human microbiome, and its connection to some disease process or another. What research exists regarding the microbiome in other organisms? I can only assume that industrial scale use of antibiotics has caused some disruptions to the gut flora of livestock animals. Do they ever get probiotics to keep their microbiome healthy? Do plants have a microbiome? There are well-known symbiotic relationships with plants and fungi; what about plant bacteria? Sorry for the open-ended question, I was just musing on the subject. [link] [2 comments]  |
| When you're sick why do you feel hot and cold at the same time? Posted: 04 Dec 2015 10:52 AM PST |
| What about a volcanic eruption makes lightening occur? Posted: 04 Dec 2015 11:50 AM PST |
| Posted: 04 Dec 2015 10:06 AM PST |
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| Posted: 04 Dec 2015 08:05 AM PST Since time dilation reaches a limit at the speed of light, at which photons travel, does that mean that from a newly generated photon's point of view, the moment it's released from an energetic reaction and the moment it "hits something" happen at the same time? And, as a related question, since space compresses in the direction of motion near light speed, also bearing a limit at light speed, does that mean from the photon's point of view, space is so compressed between its origin point and its absorption point that no distance is actually traversed? [link] [29 comments]  |
| What would be the consequences of growing crystal in different gravitational influence? Posted: 04 Dec 2015 07:29 AM PST On a purity level, I guess the crystals would be perfect with a pure germ in zero g, but wouldn't the bonds be weaker, or the opposite when a crystal would grow in a high gravity environement? [link] [5 comments]  |
| Can animals in the wild get PTSD? Posted: 04 Dec 2015 05:43 PM PST |
| If 0^0 is one, and 0^(x>0) is zero, can we define the Dirac-Delta function as simply 0^|x|? Posted: 04 Dec 2015 08:08 PM PST I mean the (EDIT: I meant the Kronecker-Delta) function is always defined with crazy distributions and sums/limits that are too complicated for me; couldn't we just say δ(x) = 0|x| to make it nice and easy? Or is there a good reason we don't do that? Thanks [link] [14 comments]  |
| Is consciousness dependent on memory? Posted: 04 Dec 2015 03:22 PM PST |
| If heat and sound are both vibrations of molecules, what's the thing separating them? Posted: 04 Dec 2015 02:45 AM PST I remember reading in physics textbooks over and over that heat is vibration of particles, and so is sound. So, what's the threshold? What decides where heat ends and sound begins? [link] [9 comments]  |
| Do we observe each other as objects or subjects? Posted: 04 Dec 2015 06:20 AM PST I recently read about objectifying someone and how it's automatically a bad thing, but isn't that how we see other people in everyday life? We obviously know when thinking about it that other people have a consciousness and feelings but do we really take that into consideration when interacting with other people? [link] [1 comment]  |
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