Recent content by jhartc90

Homework Statement If I consider a force, which is applied to both ends of a rectangular beam to its cross section with dimensions w (width) and h (height) and I know the length of the beam is l and the force is parallel, how can I calculate the stress? Also, what if the force were parallel to...

Homework Statement I know that at 18,000 ft. above mean sea level, the atm. pressure ~half of what it is at seal level (760 Torr). The temperature also decreases by 70C. a. How would this change the speed distribution of the air molecules quanitatively? b.How would it change the mean free...

what page in the book is the derivation of this on? All I see is a figure (Fig. 9.2-1)

Homework Statement I would like to derive an equation that relates the thermal conductivity to the pressure using the kinetic theory of gases. However, I assumed that thermal conductivity was independent of pressure. Homework Equations I know that P = 2N/3V (1/2mv^2) Also: I believe that...

I think i may have figured it out, perhaps the thread should be closed?

It is in time and not space. We have a 2D Fourier transform. If the function is transformed correctly twice, due to two times and two frequencies, the answer should be able to be obtained.

I should be more specific. The problem is attached for complete clarity, noting that I need to state any assumptions. The reason I haven't started is because I am not fully sure how to start. Should I Start with separation of variables? Should I start with identifying a proper eigenfunction...

I attached the file. We are suppose to also state any assumptions we make.

I'm guessing the eigenfunctions will have a sin or cosine form.

Ok, fair enough. I think I might have to either do separation of variable or come up with a general solution. I'm not fully sure though.

This might help. We are suppose to state all our assumptions. So, we could assume something here in order to solve the problem.

Did you see the original question? I attached file in previous response

Here I attached the full question

All I know is that F=W/r. Would I start by separation of variables? I am very confused. I just know what the derivative of F with respect to r is at r=0 and r=R. other than that, your guess is as good as mine. Thanks for taking the time to help by the way, I really appreciate it.

All i know I think I already posted. We start with the initial PDE. I know that dF/dr =0 in the center and on the surface of the sphere and g(r,t) is a known source function. I am told to substitute F=W/r to simplify the 1st term on right-hand side (which I think I did correctly but not sure)...