Physics

I'm not sure when quantum mechanics caught the interest of the public, and people began "educating" themselves on the subject, but I want nothing more than for it to go away, and never be talked about on televison, or at parties ever again. TV shows like "Through the worm-hole" are literally making ignorant people who have no idea what the hell their talking about, even MORE ignorant. All the sudden I go to friends houses, or I over hear a conversation that sounds like this "...oh, yeah, but there are infinite universes, and time is infinite so time travel is possible...string theory makes so much sense, its the only quantum theory I believe (real quote)". For…

I haven't heard some interesting new discoveries lately.

Can gravitational force be turned into speed or propulsion?

As relativity describes the beautiful relationship between space and time. Time flows, so does space. Dark energy is responsible for the expansion of space. So I concluded that dark energy should also be responsible for time to flow. Is that a good idea?

Is it possible to get free energy with magnets? I'm asking because I came across this video and I can't figure out how it was done if it's not real. The video is a little long but it is making voltage. Any thoughts?

The question is in the title Here is what i mean What stops it from just falling in a straight(ish) line? because as you can see it moves a fair distance from where it was dropped

An optical fiber is known as a flexible, transparent fiber made by design glass (silica) or plastic to somewhat of a diameter slightly thicker than that to a human hair. Optical fibers are used most often as a way to transmit light between each of the ends of the fiber and locate wide usage in fiber-optic phone calls, where they permit transmission throughout longer distances and at substantial bandwidths (data rates) than cable cables. Fibers are used as a substitute for metal wires because signals travelling along them with lesser numbers of loss, in addition fibers also are immune to electromagnetic interference, a predicament which metal wires suffer as a result of ex…

Hi. Which laser beam does more burning damage to a retina ? Passing trough a 3 mm pupil opening, both cases same hazardous power : A 3 mm diameter beam, or a 0.5 mm diameter beam ? Does a wider beam damages less a larger retina area, and a smaller beam a worse burn but in a smaller area ?

Hy. Is it ok to share ideas with people before publishing them ? Or there is the risk someone to take it from you ?

The signal to noise ratio is improved by the number of readings the MRI scanner detects. If we have a longer T2* phase does this mean that the signal lasts longer? In-turn does this mean that the signal to noise ratio increases as the T2* phase increases? Does anyone know of any references for this area? I've been searching for ages and coming up with nothing. Many thanks

This has been bothering me for awhile now I've been thinking a lot and the basic law of everything is that both sides of an equation must be balanced. So imagine that our universe is one side of the equation I've always wondered what is the other side of the equation. Now my theory is that on the other side of the equation there is a completely opposite and inverse version of our universe that cannot exist I'll refer to it as the antiuniverse. Confusing right? I'll try to explain. The basic thought process is that if our universe exist the antiuniverse has the exist as the nonexistent opposite of our universe. This means that it does not exist but it is still present so i…

Hi everyone An example question of my first aid theoretical exam in medicine is: "Given an oxygen tank with a volume of 5 L, a pressure of 50 bar and a flow of 15 L/min. How many minutes could you use the tank?" And so, 20 seconds, I'm not even going to explain how I got that answer, since it's too obvious -- is too obvious. There must be more to it than only that... I mean, the pressure, I'm sure I need to do something with that. But what? Can someone help me? Thanks! F

I have an idea about the speed of light that – as I’m mainly a complete outsider in the field of physics – maybe has nothing relevant or new at all or is just a complete disaster, but it bothers me a lot. As we know, speed is the magnitude of the objects velocity, thus it is basically a distance travelled by an object in a certain unit/duration of time. What if traveling faster than light or faster-than-light speed is simply uninterpretable on the grounds of our physical system, because our interpretation and perception of time and space – which are basically define speed or velocity itself – are highly, probably inseparably interdependent with the characteristics of l…

We are getting used seeing the complicate theory of quanta be raped in every possible way by all new-age people and even by some "convertited physicist". every one sees in it what they want, so it explain karma, god spirituality... I'm kinda sick of this, and I think they have exceeded every limits This time is the Vatican that asserts that quantum physics finally give reason to the aristotelic physics (sorry Galileo ). You may think " how?". Has quantum physics discovered recently that fire goes up because it tries to rejoin himself with the sun? Has it discovered that ,in reality, the world stay still and it is the universe turning around? None of them. Vati…

I was wondering how most people manage to support themselves through schooling that is as long as physics. I do not come from money at all, so my parents won;t help at all wih paying for schooling or housing. SO I wanna know how people manage to pay for such a long education process.

/i was traveling today and having nothing better to do I was thinking about speed. Speed is represented by distance divided by time, meters divided by seconds: the amount of meters traveled in one second. The reverse (inverse, opposite) would be the amount of seconds traveled in one meter. It is the amount of seconds needed to travel one meter. Which is still a speed. Just as if the inverse of speed was speed. Or am I completely wrong?

Below is the link to Youtube video on unsuccessful (yet again) landing of the first stage of SpaceX's Falcon 9 rocket. The craft managed to successfully approach the landing pad but in final moments of landing sequence excess horizontal velocity resulted in it falling on its side and exploding. In the very final moments you can see the RCS thrusters on the top of the vehicle working hard, but still they couldn't stop it from falling: https://youtu.be/GbYQQE5LZ2E Anyway, I'm generally really supportive of what Mr. Musk and his team are doing and this technology seems like a very important advancement in attempting to make space flights cheaper. Obviously I don't ha…

Spacecraft has momentum= - p . After gravitational action the spacecraft has momentum=p. Does owner of the gravitation recieve momentum= -2p ?

A magnet is demagnetized. In a closed system there is a ferromagnet and two chemicals in a packet nearby. If the chemicals are exposed to one another thermal energy is generated. (There will be a decrease in chemical potential energy and an equal increase in thermal energy.) The increase in temperature will be enough to raise the ferromagnet above its Curie temperature. (There are no other strong magnetic fields nearby.) EN1 The chemicals are exposed to one another and the temperature increases. The ferromagnet becomes demagnetized. The demagnetized state is a higher energy state than the magnetized state. EN2 There is a decrease in chemical potential …

My friend says that zeno's paradox of arrow could be right, and motion could be like like a camera taking photos in succession? that we just move from one 'NOW' to the next. Is it right? Does zeno paradoxes apply to reality?

I found very few information about it. the most meaningful being this excerpt below, from this site http://www.quora.com/What-is-the-rainbow-gravity-theory-in-laymans-terms (which is not the best information source) Till today I had never heard of "rainbow Gravity". There are few youtube videos (not reliable by definition) and no mention found in Wikipedia although being around for about a decade. What about it? And why is it not accepted? Thanks

. A Question about the Logic of the Law of Conservation of Energy with Demagnetized and Moving Magnets. There are two closed systems. In terms of energy each system is identical. In each system, there are two magnetically aligned ferromagnets. One is fixed in place, and the other one is in motion moving towards the fixed one due to their mutual attraction. In each system, there is a chemical heat pack. If the chemicals are exposed to one another thermal energy will be generated. The temperature in the vicinity of the heat pack after the chemical exposure will be greater than the Curie temperature of the ferromagnets. (And after that, …

Assuming that matter and energy cannot come from nothing (and there really is no evidence that they can) and assuming that there really is no God, then what really caused the big bang? What caused time to suddenly start ticking from t = 0?

How does a rocket moves in the space? By newton's third law of physics a force must be used to boost the rocket. In the earth it can be easily done because the rocket;s fuel use force to move on. But in the space there's no air or gas or anything. So by this law, how does a rocket moves in the space?

Please refer to the spinning skateboard wheel in the video below. Those of you with the patience to watch it to the end will notice the wheel does indeed stop spinning. Why question to you is why does the wheel stop spinning, more specifically how is the angular momentum be conserved if the wheel stops spinning? Saying friction causes the wheel to lose kinetic energy true, but does not explain how momentum is conserved. GL