# Science Help

25840 Posts - Page 1291 of 1292

## Need some help deciding Final Year Project... Ideas welcome

Hi I'm about to start my 3rd year in my Engineering university and would like some ideas for my Final Year project... We have 2 options. We can either make a model/prototype of something and present it OR we can do a research on a particular field. I'm leaning more towards the research side,... Need some help deciding Final Year Project... Ideas welcome

## Noether vs Ward Takanashi

In quantum field theory, the analog to Noether's theorem, the Ward–Takahashi identity, yields further conservation laws, such as the conservation of...Click to expand... Noether vs Ward Takanashi

## Why is a solid, so solid?

I was wondering this question the other day and have read a few websites but a lot of it goes over my head. I have two questions, can anyone explain in relatively simple terms? I am happy to read the more detailed science behind the concepts, but need the concepts to be stated pretty plainly. What... Why is a solid, so solid?

## New Type of Space Elevator?

What would the problems be with having a hollow cylindrical space elevator made of carbon (e.g. recent benzene linked chains) and instead of having the payload climb to the top you filled the inside with 1 ATM of air and floated to the top via balloon?

## Need of automotiveknowledge

Hi! I have recently started working at an automotive company at the body and trim section and I feel like learning everything about the area. I have had trouble finding good study material at the library and with my searches on the internet so therefore I ask you guys for some help. From start I... Need of automotiveknowledge

## Debye Temperature

If the young's modulus, Poisson's ratio and Density of Gallium arsenide is given, how do I find out the Debye temperature using an appropriate formula?

## Certificate warning in Chrome

Chrome is giving the following warning: The identity of this website has been verified by RapidSSL CA but it does not have public audit records. The site is using outdated security settings that may prevent future versions of Chrome from being able to safely access it.

## Voltage and current in a resistor

So I know that voltage is a sort of pressure due to an imbalance of charges. And current is the resulting flow of charges. So when it comes to a resistor, does the resistance draw a current from the curcuit as well as a voltage? And what is meant by "voltage drop" across a resistor/element. Please... Voltage and current in a resistor

## Ukrainian mess

That's just through the border from here... Sigh, few days ago it looked as the situation was calming down. Apparently it wasn't. I wonder if anyone is really in the control of the situation on the gov side, as I have no doubts protesters are not controlled by anyone en mass. MOD... Ukrainian mess

## Heat transfer and combustion

Hi am a bit stuck on understanding how these two correlations can be similar I am wondering if anyone can ahead any light Can anyone solve Correlation for heat transfer by natural convection from a horizontal pipe to atmosphere is; Nu = 0.53Gr^0.25Pr^0.25 Nu = hd / k Where, Gr = αρ²d³(Ts-Tf)g... Heat transfer and combustion

## The Theory of Band Bending

I'm trained in Condensed Matter Physics, and I'm trying to learn EE. The concept of band bending always baffled me a bit. Here's why: The band edge bloch states are delocalized over the whole of the crystal, and have fixed given eigenvalues. How can this eigenvalue change over the length of the... The Theory of Band Bending

## Formula One Cars Momentum

1. The problem statement, all variables and given/known data Why are formula one cars(except the place where the driver sits) designed to break apart into small pieces very fast? I believe that there is all kinds of things as aerodynamics, but my assignment talks about how the breaking apart... Formula One Cars Momentum

## What are the fields produced around a current carrying conductor?

If we consider a current carrying conductor, every instant an electron enters the conductor, another electron will be leaving the conductor. Thus, the current carrying conductor will not be charged (i.e, it would not have any net positive or negative charge). Remember dipole has zero net charge,... What are the fields produced around a current carrying conductor?

## Special Relativity: Time dilation problem

1. The problem statement, all variables and given/known data (Hint: it may help to draw a space-time diagram showing the events described in this scenario.) The starship leaves Starbase Q at... Special Relativity: Time dilation problem

## Is it possible to simulate gravitational waves using python?

Hello all, Well, I am on my master project named 'General Relativity & Gravitational Waves'. My supervisor asked me if you can simulate gravitational waves by programming it would be a plus. But only programming language I am currently learning is python. Is it possible to simulate some kind of... Is it possible to simulate gravitational waves using python?

## Multipole expansion - small problem

1. The problem statement, all variables and given/known data Jackson 4.7 Given a localized charge distribution: $$\rho(r)=\frac{1}{64\pi}r^{2} e^{-r} sin^{2}\theta$$ make the multipole expansion of the potential due to this charge distribution and determine all nonvanishing... Multipole expansion - small problem

## Matlab Programming

1. The problem statement, all variables and given/known data Write a program for a simple guessing game. The program should first prompt the user for a number between 1 and 100. After each guess the program should inform the user whether the guess was too high or too low. When the user picks... Matlab Programming

## Normal modes of electromagnetic field

Hey guys, I'm trying to understand the properties of the normal modes of the electromagnetic field inside an arbitrary cavity, but I'm having some trouble. By definition, for a normal mode we have $\mathbf{E}(\mathbf{x},t) = \mathbf{E}_0 (\mathbf{x}) e^{i \omega_1 t}$ and... Normal modes of electromagnetic field

## calculating defelction of concrete

I have a large machine that must be installed on concrete foundation. It can have no more than 20 micron deflection. Are there different types of concrete? The specs i have from the manufacturer recommend Foundation block reinforced concrete C30/37. this is 1500 mm deep foundation that is 7730 mm... calculating defelction of concrete

## Green's Function in Cartesian Coordinate

1. The problem statement, all variables and given/known data A hollow rectangular box with sides a, b, c are formed by conducting plates. The top plate is held at potential +V, while the bottom at −V. In addition, a point charge is located within the region at (x0, y0, z0).Using the Green’s... Green's Function in Cartesian Coordinate