Physics

Hey can someone explain how are these equations deduced?? Or anything interesting u have to share about these equations.

You know, if you throw balls (upwards) while on a moving platform, which I did; the platform had no walls or any of the sort and the ball simply moves away from me landed on the ground. I presume this was because of the wind, I am not so sure... Now, I did this same test while I was inside a bullet train, and, of course the train had walls and roofs so there was no wind, and the ball simply landed on the palm of my hand. Please explain, is wind resistance the sole reason why the ball was being carried away as I threw it up? I mean, if you'd imagine. should the ball be displaced in air as I threw it up without the required force to bring it back to my palm? …

And what's a black hole made of?

Hi. In your opinion, would a plain speaker propagate sound reasonably fidel underwater if lowered to 30m depth inside a hermetic plastic bag filled with light vegetable oil and if needed, a little air left in by the moving coil ?

So here I am just a regular kid wondering in the realms of physics. Yes, nuclear bombs, TNT, whatever it is - products that explode produce such a substantial amount of force. Nuclear bombs when in effect produce so much force it could level an island, it is utterly devastating. However I want to bend the realm of physics a bit. Assume, just, assume we humans have the capability to generate the force equivalent to that of a nuclear bomb in a single punch/jab. What would happen? Will there be explosions like we see in nuclear bombs and TNT's? Please dear people of science forums, enlighten me. Thanks .

I was reading how earths core is heated by radio active decay and I was wondering if someone picked up a piece of uranium or plutonium that let's say the USA was Making a nuke from would it be hot to the touch? Isn't it mined for? If someone touched the raw material would it feel hot. If so how hot?

Specially Sun's energy?

And what can we do with it? What's it for?

Would it explode the Earth?

And would it change Earth's orbit?

What are the exactly steps to do it? What kind of machines are used?

As title says, i wanna know how I could destroy the Earth.

This might sounds weird, but I'm planning to carry or stitch some battery-powered PC case fans inside my jacket to fight the heat outdoor. I live in Indonesia and the air humidity level is always high for most part of the country, and it makes outdoor activities almost impossible to enjoy, except for the first quarter of the day and the evening, or during cloudy days. My question is, should I set the fans as exhaust, intake, or exhaust-intake setup? And should the exhaust points upward or downward? Thanks.

"Chris Nagel heads an independent lab that researches the fundamental physics of matter (especially metals) in its relation to energy (light). … Currently Nagel focuses on applying low levels of energy (optical and thermal “tailoring”) to select combinations of metals to alter their base properties in multiple ways. Such tailored metals have achieved distinctly unexpected levels of transparency, conductivity, hardness, magnetism, and catalytic activity, both as permanent and transient variations. " https://techtv.mit.edu/videos/26167-chris-nagel-light-the-architect-of-matter

So sounds crazy but disregarding the different nature of thoose 2 kinds of waves , what would happen when they are propagating in the same medium. From quantum mechanical prespective for instance do the two wavefunctions interact each other someway. What would be the result . Or let me simplify my question . What is going to be if you talk to an antenna since it carries some EM radio waves and you add it your acoustic vibrations ?

I have a ski board Magnet that makes it float in the air has broken I do not know his name or type magnet in order to buy it I'm putting in your hands the red color images here have damaged portion http://im46.gulfup.com/rhsaMf.jpg http://im46.gulfup.com/Ym2t7X.png http://im46.gulfup.com/XkiqPo.jpg thanks for everyone

What is the corresponding frequency of AC that is generated in bones due to their piezoelectric properties when is applied acoustic pressure in the frequency range of human voice for instance ?

Have a quick question about FAIMS. Have a friend working on ion spectroscopy but there was one thing we couldn't figure out. In some devices the drift gas to oppose the direction of the ions, while other designs have the drift gas from the same direction as the ions. We can't figure what difference this would make to the analysis, or why one is used in preference to the other. Any pointers or help greatly appreciated.

Just wanted to ask a question, old news, but from what I gather the proton is 4% smaller than previously thought, I was wondering would this make any difference to how we calculate the protons mass?

I want to find out what the minimum distortion (or curving) of space should be to prevent light from escaping that distortion. http://physics.stackexchange.com/questions/8477/why-cant-light-escape-from-a-classical-black-hole I am not aware of any way of measuring the "amount" of distortion a mass imposes on space. Can anyone shed some light? If so, would you be able to tell me the minimum amount of distortion needed to capture photons such as in the case of an event horizon.

I had today very strange dream, but i don't remember anything except the will, to learn nuclear physics. Its hard to explain, but after i woke up i started reading about nuclear physics. To be honest i didn't understand anything, maybe because i'm too young? Age-16

Recently I watched a couple of fun YouTube videos on Klein bottles. In one of them https://youtu.be/4XN0V4xHaoQ the Mathologer, a math professor I think, talks about the mathematical possibility of a universe being shaped like a 3d counterpart of a 2d Klein bottle surface. That would mean that somebody living in such a universe could turn himself into his mirror image by travelling along certain closed paths. Is there anything in physics that would indicate that such mirror-reversing paths are or are not present in our universe?

I've been researching for a while now but i can't find anything that answers my question. I'd like to know what are the radiopaque materials? That is, which materials can x-rays not pass through? Thanks in advance.

I have a very old comic book that I want to sell. It was graded and sealed in plastic before I bought it. Recently it was discovered that one of the writers left a hidden message in a select few of copies on the inside cover. I need to see if the message exists in my copy before I sell it because the value would be increased. How can I see through the front cover without opening it?

Someone told me to watch this and prove it wrong. What do I say. Help. gwwdvd.com What do I say. I want to prove this wrong. Thanks.