Physics

Let's assume a machine with substance A as the fuel. The output of the machine is electricity plus a product B. 1 kg of product A yields 1 kg of product B and C kWh of electricity. If the calorific value of product A is for example 20 MJ/kg and of product B it is 15 MJ/kg The electric output C of the machine from 1 kg of fuel A is 2,777 KWh. 1 kg A ---> 1 kg B + 2,777 kWh electricity A simple attempt to do an energy balance based on the calorific values gives the following: 20 MJ ----> 15 MJ + 2,7777 kWh 20 MJ ----> 15 MJ + 10 MJ Is this a possible situation? If so, how can it be accounted for that the energy content of the reaction produ…

If a black hole is of infinite density but Zero diameter does that make it a 2 dimensional or a 1 dimensional Object

Hi folks, Info on microwave ovens often talks about the direct efficiency of converting electrical power to microwaves. Ok, that's pretty straightforward; I am NOT asking about that. I can't find much of anything that addresses the "efficiency" of the microwaves that are created, being converted to heat in food. Said another way, what happens to microwaves that "miss" the food; are they simply lost? Many illustrations showing magnetron emissions appearing to bounce around in the oven, and info says the walls are highly reflective... do they keep bouncing until they hit food, conferring very high efficiency? Or is this even the proper way to think about it, sin…

Could someone please give me a complete list of all the mathematics that I need to know in order to be able to understand quantum field theory and string theor/superstring theory/M-theory.

Just having some difficulty visualising how electromagnetic waves transmit energy. It is easy enough to visualise when waves propagate in a medium -the kinetic energy of sound waves for instance. But light does not need a medium to propagate. Is the wave itself energy, though i'm not even sure what that means? Is it the disturbance in the electromagnetic field which carries the energy? This i can visualise but then i'm missing something else as it would then seem that light is propagating through the electromagnetic field - contrary to what i have learnt.

Honestly, I am amazed to those who can express formulated theories in an understandable language of those who don't have such knowledge in the field of physics. But, I want to know the opposite. How does a person who just got an idea about something to formulate it in the language of mathematics and physics?

After watching a show on Multiverse and Multi dimensions, they outlined there could be Possibly 4 different types of Multiverse's, saying that one of them,dictates our Universe to be Infinite, yet there also be an number of Infinite Multiverse's contain exact copies of me and everyone on the earth, Varying slightly or Drastically in Difference and Lifestyle, i think to my self if our universe is infinite why would there need to be copies of a thing that is infinite to begin with, and as to the copies of Us, why would there be a universal or multiverse law to be exact an have the same of everything just differing is some way..?

Hello everyone Let me just ask it: If you look to the image below, which mass would need to be on the question mark? (I never treated this kind of matter at school, yet I fear this is a very good question for the Med School Approval Exam) I'd say: [math]2(M\cdot g)=2(2m\cdot g)+6(5m\cdot g)=34 m\cdot g[/math] [math]\Leftrightarrow (M\cdot g)=17m\cdot g[/math] [math]M=17m[/math] Yet I fear this is wrong. Don't know why. Thanks. Function

I'm reading and learning about the Higgs boson at the moment. So, I'm just throwing out a question: Does the Higgs field cause light to have its constant ("speed of light")? I'm speculating from what I've heard and read of the Higgs boson. It seems like the bosons are the sands of time. However, I'm more focusing this thread on the speed of light. Because if what I heard is true, then the Higgs field does not affect the speed of light. However, I consider there may be more at play in that the Higgs field gives light its speed, thus the Higgs field acts as a constraint on the speed of light. Thus, I question if there was a way that the Higgs field could be repelled or …

Hi, I'm working on this science experiment in school, I don't really wish to go into details, but I would like to use this experiment I found online in this article: http://phys.org/news/2011-07-coke-cans-focus-diffraction-limit.html I have tried to mimic as much as I can from what I found out on the small article but I'm having trouble recording the resonating tone of a can. So far I have used a simple phone microphone but it captures the overlaying tone and the resonating tone is faded in the background. I'm wondering if anyone would have any ideas of how to get a finer recording of the resonating tone. Unfortunately, the article I discovered the experiment …

Can lightning produce gamma rays?

So in 2019 or 2020 the ITER (Pronounced "eater") will be finished hopefully. I myself am skeptical as to it being finished by then. I'm 14 so if the plans go as according it'll be great because I'll be able to see the beautiful price of scientific ingenuity and machinery in action. I would kill to work at this thing. But like I said I'm skeptic about it. And not to mention what the scientists working on it are saying. That this beauty will pump out 10 times more energy put into it. That means there's a viable option of pursuing a bunch of reactors if it works as planned. If this happens it'll be the day I cry out of pure beauty. Now my field of interest is nuclear fusion …

A friend I know has recently got an interest into the theoretical of Black holes and I wanted to recommend some literature on Black Holes. Since I mainly work in the field of mathematics and computer science, I wanted someone else's recommendations. So, can anyone give a list of recommendations of literature for new physicists about Black Holes?

Proof of the existence of God found in Colombia? An image found on a rock in Colombia violates laws of Physics and all that is known by science... the image is part of the rock and the colors are part of the rock itself. so the image was formed with the rock... Explanation?... Anyone?...anyone? http://third-secret.pro-forum.co.uk/h65-final-proof-of-the-existance-of-god-published-in-colombia

Hi, Fundamental frequency is the lowest partial in signal analysis, and the harmonics of the fundamental are multiple integrals of that. But I've heard of 'subharmonics' where people are claiming that you can have integral fractions of the fundamental frequency in music. don't understand this, as I thought the fundamental was the lowest, by definition. Anyone who is clued up in Acoustics that could perhaps explain this in more depth? Is there such a thing as subharmonics and how does work in relation to the fundamental?

on these forums. Books that have been recently denounced: ISBN 0-316-15579-9 The Cosmic Landscape ©2006 Leonard Susskind First Edition: December 2005 Little, Brown, and Co. New York USA May I please have an explanation why this book is not acceptable as a reference on this forum, since it is a legitimate publication by a famous physicist? Thanks in advance. Please be aware I will be informing Dr. Susskind of your response. You should be aware that he has responded vigorously in the past to accusations against him similar to yours. Good luck. While we wait, I will append a list of books you appear uncertain about: Albert Einstein, Relativity…

How Much Uranium need for run a 100MW nuclear power Plant (working 24 Hrs day )for a year swansont-total uranium in Kgs

Hey guys, I'm confused with some questions and hope you guys can help me 1. The plasma is where electrons and nuclei of atoms are separated. If the electrons are separated from the atoms, how can the electrons of atoms be excited to get to higher orbital and then get back to the ground state and emit EM waves? 2. At a high enough temperature, will the elements(lets say hydrogen) emit a broad range of wavelength of EM waves like a black body? Or will it only emit certain wavelengths according to the atomic emission spectrum? why and why not?

Can someone provide a link to an accurate description of the double slit experiment. i mean, not the result, but all the details. More specifically, I'd like to know the following 1. what is the material of the shield (the blocking screen) that have the 2 slits 2. whether this shield absorbs perfectly the photons that hit or whether the photons are reflected back in the room. 3. the thickness of this shield 4. the wavelength of the emitted light. For example I have read that the original experiment by Young was made with sunligth (I suppose with visible light). Visible light has a wavelength between 380nm and 780 nm. So if the shield in which the slits are o…

Hi I have a project and it's obviuously about projectiles. I need to build my own mechanical machine to launch my projectile, like a catapult or something. The goal is to hit a target that is 5-8 m away from the starting point, and I will be tested by it's accuracy and distance. I'm thinking about a machine which I can adjust the angle, and measure the force that will be applied to the projectile.. any ideas how can I do this? I need plenty suggestions. THANKS!

I'm making a project for school about time dilation, however I would need proof light has the same velocity to all observers. I know it's a postulate, however I couldn't find any experiments that prove this. I would like to have this knowledge for myself alongside the people I'll be presenting it to.

Hello everyone, If a spaceship was accelerated to the normal speed it takes to leave our atmosphere, was factors would cause the slowing of said craft? I already know a collision would obviously prevent further movement, but what else would slow it down? If a zero gravity condition were to present itself, would the craft perpetually travel forever? Thanks in advance for the input. Michael

Hi everyone, I'm working on a project where I need to project a sheet of light across a 14cm gap. I had an idea to use a line generator (fresnel lens) on a laser, and project the line onto the edge of a piece of acrylic so that the front (receiving) edge of the acrylic collimates the beam and the output side just presents a flat sheet of light. My problem is calculating the curve required on the receiving edge (I guess it's a parabola) to make the light "straighten". I have various laser lenses on the way of different angles so I can experiment with the source, but have no idea how to calculate the angles required to refract the diverging beam from the laser back …

What Can we do if we invented a system to achieve Superconductivity in room temperature?

Hi. What is the physics effect going on ? Or is it another tricky video ? ----> [http://www.youtube.com/watch?v=Y9_Fqvux_bg]