Recent content by chandrahas

I have assumed steady state

I believe this might be a possible inconsistency. This is the answer I have received from multiple sources. But it still seems to me that I should be able to approximate it as incompressible for small velocities. But this would in-turn mean a small force, so I guess both equations agree...

The equation I used from the source I linked claimed that the body force term cancels out with the material derivative term of fluid velocity squared. I have also followed through with the derivation and it does indeed cancel out. However, I am wondering if I should include the potential...

Consider the case of a one-dimensional incompressible, non-viscous fluid flowing down a vertical pipe under the influence of gravity. Since we assume the flow is constant along the cross section of the pipe from the one dimensional assumption, let us denote the velocity of the fluid down the...

Fluid Mechanics seems interesting but I don't know of any position that doesn't require a BE in aerospace or Mechanical Engineering. What skills and classes would I need to be competent and to what extent? Maybe I can, in addition to a few fluid mec courses, do a few independent study in fluid...

I am currently a international freshman studying in Stony Brook and majoring in Physics and, if appropriate and after official request, Mathematics. I feel very passionate about theoretical physics and intend to get a phd in it and get into academia soon after graduation. I believe double...

I was thinking about hall conductivity, when this question popped up. If there is a magnetic field and an electric field perpendicular to it, then a hall current is generated since the ions have larger gyro radii compared to electrons. Now this current would produce a J cross B force in the...

Thanks I think I understand. But by refurbishing what is being done exactly, because they don't have any heat shield. Is it the engines and the surface material?

So even though the fuel costs are low, the cost to build the structure is high? But this would be okay for reusable rockets right? Then even with spaceX's reusable rockets why is the launch cost still very high?

Rockets are quite expensive and it takes about 2000 to 10000 dollars to place 1 pound into orbit. So I was wondering: Is the size or the fuel mass of a rocket a big concern or will it be of no help economically if we make smaller rockets with less fuel mass for the same amount of payload...

I've read on wikipedia that the force drifts of the guiding centers off particles in a magnetic field also occurs in cold plasma. But does it occur in a cold plasma (Partially Ionized ) in which the mean free time is less than the gyro frequency time? I thought that the drift were present...

Oh, didn't know that. I thought a decreasing field would be analogous to a bar magnet moving away, so a field opposing this motion is a field that attracts the moving magnet and make the magnet stationary. Wouldn't this correspond to an attractive field? I don't understand.

I meant that during the first half of the AC cycle, it is divided into 2 parts. One where the field is increasing, and the other where the field is decreasing. Here, in the first half of the picture, The field is increasing and hence the induced currents oppose the magnetic field repelling...

Alright I'll check the simulation then, I might have gone wrong somewhere.

Oh ok, thanks, I think I understand the vibration part. But another question that I was thinking about was this: I used comsol (multiphysics software) to run a simulation of a conductor in a varying magnetic field and it seems that the levitation force is stronger than the attractive one even...