Recent content by math_04

The velocity should be 0 m/s at pipe wall right? Because of the no slip condition?

Homework Statement Water at 20 degrees C flows in a 0.8cm diameter pipe with a velocity distribution of u(r) = 5[1-r2/(16x10-6)]m/s. Calculate the shear stress on (a) pipe wall (b) at a radius where r = 0.2 cm (c) at centerline of pipe Homework Equations Shear stress = viscosity x du/dr...

Thanks for the article meopemuk! It was an interesting read although I have a couple of questions. 1. In the section on special relativity, you write that the Lorentz transformations are derived for 'photonic events only'. I only thought that people used photonic events to talk about time...

Hi, I am wondering what everyone here thinks about some of the work that has gone into researching quantum mechanics without spacetime. I am only a third year physics student at college (having done classical mechanics, electromagnetism and quantum mechanics upto perturbation theory, special...

Yes, well Obama has not faced the criticism that Bush faced! Well at least they are frightened of Obama, that has got to be a good thing :smile:

It is a safe bet. Iran, despite its statements about Muslim brotherhood and leading the Muslim world against 'aggression by the West, puts its national aspirations first. It has precious few allies in the region, and as a military power and a nation with veto powers in the Security Council...

Homework Statement Check the gradient theorem for the scalar field T= x^2 + 4xy + 2yz^3 and the paths a) (0,0,0) to (1,0,0) to (1,1,0) to (1,1,1) Homework Equations Equations = none well maybe divergence of a vector field= (df/dx)*x + (df/dy)*y + (df/dz)* z where x,y and z are...

Photovoltaics engineering maybe? Depends on your college and what they offer. I believe that photovoltaics (solar panels) is a branch of electrical engineering, it is where I study. A physics degree would also serve you well, but you probably will need to study postgraduate as well.

You think so? .

An individual who realizes the boundaries of his knowledge would be in a better position to push those boundaries of knowledge further and lessen his ignorance on a particular subject(s). Like Harry Callahan (Dirty Harry) once said 'A man must know his limitations'. :smile: I think realizing...

They are sought after, remember that physicists are hired across many fields like defence, technology, energy, teaching etc. Normally a bachelor's degree will take you to teaching in schools, working at a technological firm etc. If you aim for a Masters or PhD, you probably will be able to...

http://www.timesonline.co.uk/tol/news/world/middle_east/article6644817.ece Well, the largest clerical association in Iran has declared the election invalid. It should be interesting to hear the reaction from Ayatollah Khamenei and the ruling government. According to Fareed Zakaria, the power...

Yes, that is what I also thought at first. But then again, it might have just been the stress of the job and the inability to wade through tough political battles. I have noticed that she, on many occasions, runs away from a tough battle, plays the blame game numerous times, despite having a...

What is wrong with learning as you go? A hallmark of a great, successful person is the willingness to listen and learn from past experiences whether good or bad. As for all those questions, most of them have been answered by Obama. As far as I am concerned, they seem logical and follow reason...

They did not, Obama was humble enough to say that his foreign policy credentials were not great but that he was willing to learn. Compare that to Sarah Palin who said that she dabbled in foreign policy affairs just because Vladimir Putin flew over the state she governed. :-p What credibility...