Recent content by hyper

Can someone confirm this? If so, are there any respected websites on the net that can confirm this theorem?

I don't see how tau(xx) can be the preassure, since the preassure is another part in the equations in my book, and it is also another part in the anvier stokes equations.

Hello, I read some fluidmechanics and there was something I didn't understand. The shear stress in a Newtonian fluid is tau=viscosity*dV/dy, (no need to be dy, but dx and dz also can do.) A shear component called tau(xx) came up, I have two questions about this component: 1. Shear is...

Hello, I need to find the volume between the plane z=1 and z=10-x*x-4*y*y. I have tried using polar coordinates: first integrate from z=1 to z=10-x*x-4*y*y The I integrate in the plane z=1, but here I need to integrate over an ellipse, how do I do this? When I wrote the expression to polar...

This answer was way over my head so I can't control if it is correct(I have not learned about Laplace, since I am at my first year at engineering school). But the guy who came with it seems to know what he his talking about: First he posted the picture...

Hehe it seems we don't get anywhere here, it seems like you really don't get the question. Maybe the question is too hard, I asked it in another forum and I got an answer, but to obtain the right equations you have to do a lot of work, or you sbould use something that is called a...

I do get the analysis by looking at it in a pureley kinematic view and I assure you I am not confused. And I do agree about how they derive their equation. But to get a driven oscilliation you DO need a force, and it is this force I want to look at. What I mean is, I want to understand the...

Other than how they did it. I mean: how can you explain the the force on the system is m *\frac{d^2}{dt^2} (Xb), is there another way you can see this?

Thank you for the answer, but let me rephrase the question then: In the problem I don't really care how big the frame is, and I get your point. Trying to solve the problem this way would be impossible since we don't know the weight of the frame. So how big it is doesn't matter as you say...

Hello, I have a question about structural dynamics. The question is about a forced oscilliation. My question is about this picture, with the very short text: http://img17.imageshack.us/img17/5025/sd001.jpg This is a forced oscilliation with the ground moving, and a mass inside a structure...

"should be a big hint there if you write out the equation... " Thank you, this statement made me figure it out.

lanedance: If you read my post you will see that my question is allmost a yes or no question.

Hello, I have two materials with different thermal conductivity. http://img4.imageshack.us/my.php?image=heat.png I am supposed to draw the temperature vs. distance graph between 23 K and 200K. I assume that in it is a linear decrease if you look at only one of the materials, but they have...

Thank you. I got it from the sollutions manual from Thomas Calculus.

But look in the yz-plane, we are supposed to see the hyperbola y^2/(16)-z^2=1. The means it is supposed the cross the y-axis at y=+-4, but it goes all the way to the origin?