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1. ### I Dissolution of a metal sphere

Hello Simon, Thank you very much for your response. Maybe I am not fully understanding your answer. The A, I am trying to find is not the surface area of the sphere but rather a constant found in the solution to dm/dt = -c*s(m) = -c*4πi*(3m/(4πi*ρ)^(2/3) (equation 1) where the solution to...
2. ### I Dissolution of a metal sphere

Hello All I could get some help I would greatly appreciate it. I am trying to figure how to calculate the dissolution time of sphere undergoing constant corrosion at a rate of corrosion. Through a little google-fu, I found an article which gives me the solution (...
3. ### Tungsten coated molybdenum powder

Hello Everybody, I would greatly appreciated your help. I have been working this problems for the past couple hours and can't seem to find the answer. I tried Google, and opening up my old textbooks but to no avail. I could really use some help. I have sample of tungsten coated...
4. ### Schools College Help

Thank you ever much for the reply physics girl phd. You have helped me avoid several errors in witting my letter. Thank you again. I am off to write that letter. ps. I have one more questions if you have time to answer it. Growing up I have severe learning disabilities, to the point where...
5. ### Schools College Help

Thanks for the advice. Thank you for being completely honest. Do you think I have a chance if I can do well on my GRE's. Do you have any other recommendations on UC schools that have a good materials program that i might be able to get into. I think my GPA, being only 3.21 will hinder me from...
6. ### Schools College Help

Not sure if this question belongs here, but i have a question about getting into one of the following, UCSB, UCSD, UCB, or cal tech. My first choice would be UCSB. I am currently and mechanical engineering major at sdsu. My cumulative GPA is 3.21, I am in tau beta pi (the honors society), am...
7. ### Water invert house, fill it fail?

Hello Every one, I am trying to design water vessel which shaped like an inverted house (i.e. a rectangle attached to a triangle). I want to find the pressure and force distribution along the walls of tank (it is open to atmosphere). I have tried solving this in excel using the equation...
8. ### Transient heat transfer problem in cylinderical coordinates

Ok thanks for the help. I am having a problem find the currect solutions to this problem, from a previous post of PF https://www.physicsforums.com/archive/index.php/t-204570.html i found that u(r,z) = u_0 \cdot \sum_{n=1}^{\infty}\frac{sinh(\lambda_n z) \cdot J_0(\lambda_n r)}{\lambda_n...
9. ### Transient heat transfer problem in cylinderical coordinates

ok thank you very much for the reply. I looked up the conduction equation for spherical eq and got. Can u understand this, i don't really known how to work with latex, but i can reenter it needed. 1/r(d/dr)(kr(dT/dr)) + 1/r^2(d/dO)(k(dT/dO) + d/dz(kdT/dz) + q = pc(dT/dt) once again the...
10. ### Transient heat transfer problem in cylinderical coordinates

I know my last post was a little long winded, but i here a summary of my problem. I have to use separation of variables to find the Tx in a cylinder which is heated from the a whole along its axis and the out side of the cylinder is completely insulated. In class we look at bessel function...
11. ### Transient heat transfer problem in cylinderical coordinates

y Could some one please help me. My professor for a lower level programming class (in labview) has given the class the following assignment. This is not a heat transfer class and he has not spoken/taugh us anything related to heat transfer. He emailed us a few pages from a heat transfer...
12. ### Learn LabVIEW: Books & Tutorials for Beginners

Labview help! Hello, everybody. I am not sure if this is the right spot for my question because labview is a ME not CS Does anyone have any good recomdations of books or online tutorial which can help me learn this software. I am currently taking a class in it, but the class has no text...