Physics

How did LIGO determine the mass of distant black hole mergers? LIGO found the direction to the merger from the time difference of the two detectors and from the polarization of the gravitational waves. Was the gravitational wave that was detected a combination of more then one gravitational wave?

Why do water expire? Because it is kept in plastic bottles. Water do not expire, plastic bottle does. How do you make water to not expire? We need a new type of storage possibly like graphene

I wasn't sure whether to put what I'm about to write in Philosophy, The Lounge or Physics. I'm ending up posting it in Physics as I'm about to lay out my, for lack of a better word - disgust with the directions that modern philosophy and neuroscience take in relation to Physics. I'm also thinking of running a poll to see whether my point of view is reflected or not by others more experienced and knowledgeable people. But let me get to the meat of what rattles in my mind for the past couple days and to the questions/issues I have; I've been trying to read some papers by Juan Maldacena and Edward Witten on modern approaches to QM but I gave up since I have too man…

So uh, let's say I take a jet pack and I fly slowly into space in a space suit in auto pilot mode close to 5m/h upward(This is just the upward speed, it has nothing to do with the orbital speed). What is my orbital velocity when I reach space? My speed at that height relative to the earth's orbit speed? Actually the helium balloon idea is good, I can just jet pack to space after I reach that distance

https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Bi-crystal.jpg/365px-Bi-crystal.jpg [/img]https://de.wikipedia.org/wiki/Bismuthttps://www.youtube.com/watch?v=wvJAgrUBF4wOne would have to try to create different crystal structures with other frequencies.As in the video with the Chladnischen figures it would have to be possible to create other grid structures!?!The default for the current structures could be the Schumann resonance.https://de.wikipedia.org/wiki/Schumann-ResonanzWhat do you think?Do you think that's possible?

My idea is to send heavy object slowly into space with light, and to fly with disperse photonic light

How does light propagation in water works?

This isn't meant to endorse such a project, just speculate on whether or not it's possible. Suppose Earth disposed of all its nuclear weapons by firing them at Mars or at craters on the moon. The thermal radiation would presumably be at least partly absorbed. Would there be a layer of molten rock that would then solidify in a semi-spherical shape perpendicular to these planets' gravity, sort of like the almost-flat manner in which ponds freeze over, or would it just sublimate directly into gas? If the former, would this be functionally equivalent to a convex mirror? Would we then have a "virtual image" of the sun at night that would be smaller than…

We know that light is an electromagnetic wave and it does interact with charges. It contains magnetic field and electric field oscillating perpendicularly but when we apply an electric or magnetic field in any direction to the wave the applied electric field or magnetic field vector doesn't alter the magnetic or electric field in the electro magnetic wave (according to vector addition rule)....why? I essentially want to know if its possible to "hold" light in a 3 demensional view, that has also a ceilling to stop the light from projecting it further (what maybe will be achieved by destroying it on a particular point) Hope i explained and gave a detailed question…

So I was recently watching this video: 1. Why molten salt in particular? 2. How do they decide the size of the mirrors involved? On a related note, would it be significantly more expensive, less efficient, or both, to use one giant concave mirror than several flat ones? Or is there a risk a giant concave mirror would break?

Question: Why is it hard to store renewable energy? Can't you just hook it up to a rechargeable battery grid?

I was just wondering, what exactly is movement? Like if we are all part of space, then what exactly is our movement within space? We can't move relative to space obviously, but what exactly is happening to space as we move? Wow this is hard to explain. I have this weird incomplete picture in my head of space like a thick web of strings and when we move its like the mass of strings moves with us but pulls and sways on other masses of strings from other objects. Why strings instead of water I don't know, probably just my brain trying to picture einstein's sheet metaphor in 3d. Point is I don't know how we move through space. I'm not even sure if space is an actual th…

Hello I made an experiment where I tried to align atoms by vacuum and I was successful. Would you have thought that it works? My question is now you can also produce magnets made of copper which only attract Copper? Or Gold?Can it be that we only send ferromagnetic electricity over the lines? And there are other forms of electricity? Alone a magnet made of copper or gold would be very valuable.I have already ordered a very thin sheet of copper so I can test whether you can align copper atoms also. Here are the Pictures and the Videos... Here is a video, where, however, are not so strong rashes, presumably bec…

A magnet fitted with long, straight, parallel pole pieces; will it have a constant field between them, near or distant from the magnet ? ================================================================== N magnet S ================================================================== A piece of iron placed at the middle of length or placed at the far right will attach with the same force ?

Hello all, Which software is the best (and easiest!) for simulating the attached file? How can I simulate the structure? which software? Any help would be greatly appreciated.

Say a man was to fall out of an airplane from high alt (say 7km) (assuming no parachute!), what shape should he mold himself into to maximize his chances of survival on impact and how should he attempt to adjust his position once entered into the water. From what I read around in bits and pieces I got an understanding that once you reach the maximum velocity of free fall hitting the water would be similar to hitting the concrete due to its incompressibility, thus fatal in most instances. My question is, if you can adjust your shape/position so that you pierce the surface of the water on impact and survive it, what position would this be? Legs down first or? Al…

Why is it that when integrating over all angles, integration is over the solid angle omega composed of theta and phi but the vector angle within flux, phi( r, E , omega), is resolved into the cartesian coordinates by cos(theta)sin(phi), sin(theta)sin(phi) and cos(phi) which is essentially the dot product of the radius vector from spherical coordinates with the cartesian coordinate vectors i.e. why is integration over theta and phi to remove angular dependence but when resolving the angle the dot product is as if using the radius vector?

NEXT July will mark 50 years since humans set foot on the moon. The rumblings of commemoration can already be heard – even now Ryan Gosling, deputising for Neil Armstrong in the film First Man, is being castigated for failing to plant an American flag in the lunar regolith. The moon landing was the first truly global media event, and an iconic expression of the human desire to explore and explain the universe. It is odd, then, that the anniversary of an event embodying that same aspiration has passed on 10 September with so little fanfare. With a global audience of more than 1 billion, the switch-on of the Large Hadron Collider was actually seen by more people than t…

Hello I have an idea for a substance seperator or fusion reactor. Here is one example for my idea... We study the radiation pressure on cometary dust over a wide size range in order to discuss the properties of particles in cometary dust trails and meteor streams. https://www.sciencedirect.com/science/article/pii/S0273117707005376 The hydrogen line (1420.40575 MHz) is the precession frequency of neutral hydrogen atoms, the most abundant substance in space http://www.setileague.org/askdr/hydrogen.htm When you take a hollow sphere and set a frequency on it, then must the air in the sphere, compress it in the middle of it. You m…

Ok, I have a thought experiment; a visual model. I used to run daily. I would run down the trail at an 8-minute mile. Somehow a fly that has a maximum speed of 5 mph lands on my neck. I swat the fly and it leaves my neck. Accordingly, I increase my speed to a 6-minute mile. The same fly somehow lands on me again. Every time it leaves my body from my swat in comes right back. The thing to ponder is that the fly moves slower than me yet can intercept me and after intercepting me leaves my body only to intercept me again. What are some physical properties behind this? I would like to get a variety of answers. But to show what I…

I tried to find the method online but could only find the surface tension between water and air at 20C is about 0.072 N/m. Are there any method to calculate the surface tension between water- hydrogen, water-oxygen?

I am wondering if it is possible for there to be a new type of particles that interact with known physical particles so weakly that they elude our observation, but which may influence certain physical systems in a significant way by amplifying their weak interaction via resonance. Specifically, I have in mind physical systems like a brain, where the putative weak force might induce significant resonance on the scale of neurons or neuronal networks. This would result in measurable changes in fMRI or EEG but due to the limited level of detail of our measurements of complicated brain processes it might be difficult to tell whether these changes are entirely caused by…

Hello! I'm studying nuclear quadrupole resonance (similar to NMR) and I am trying to understand the notation of the excitation sequences used in NQR spectroscopy. For example, the SLSE sequence is generally expressed as I know that teta is the flip angle and is directly proportional with the pulse duration, but as I understand, phi represents the pulse phase. If that is the case, then why does the pulse phase matter in an experiment? I am asking because I do not understand how it can influence the excitation. Or is it related with the phase used in the quadrature receiver for the sine and cosine reference signals? I've seen this phase having both positive …

Hi everyone, I’m posting this because I need a bit of help. As the title suggests it’s about a time machine, I have an image of the time machine, but I can’t identify the parts or how it’s supposed to be put together, so I thought; maybe someone on this forum can figure this out and leave me instructions. Any help would be greatly appreciated, so here’s the link to the time machine https://www.bibliotecapleyades.net/ciencia/time_travel/johntitor03.htm I would love if someone could list the materials needed for this machine and leave instructions on how to construct it, thank you.

What is best book or web site that may explain the best theories how electricity may work. What I got so far. While the exact nature of electricity is not fully known, theories have been developed that enable us to understand its characteristics and thus developed means to make it do useful work. studying electron theory is the major key. The atom is a minute particle and cannot be seen even by a powerful microscope. However, the presence of atoms may be detected by sensitive electrical instruments. Seems to be off topic talking about Matter, Molecule and Atoms. I'm looking for how electricity may work not theories or qua…