Recent content by Wildcat04

Hrmmm, just plotted it and it doesn't make sense. Back to the drawing board.

I have tried this problem several different ways and keep coming up with the answer that I originally had. I looked into some FO Transient Response problems and can't seem to get it to fit together.

I like the cheat sheet! I am not quite sure that I follow you though.

I believe so, I should have replied but I just edited the text. My solution is about 4 posts up. If you have time I would very much appreciate your approval / laughter. =)

Sir, I appreciate your help...but I think I am still missing some as you can see from my above answer. I am getting closer but not quite there yet. It may be that I am missing something in my equation still.

Hrmmm. Well, this was what I worked out with my professor last week and I have been trying to work on it for awhile. I am not sure if the link to the other post I had worked or not, but basically it is a heat transfer problem. The control volume being from x to x+dx which corresponds to T...

Homework Statement Well, I finally figured out the differential equation from a previous post (thank god) but know I am having some trouble getting the result I want as it has been 6 years since diff eq. 500dx = 20dT + 20T - 9.47(T-15)dx Homework Equations N/A The Attempt at a...

Added Word image of the collector

Homework Statement 1m wide solar heat collector that is x long. Find the temperature as a function of x. 500 W/m^2 transferred from the collector to the air within the collector, 100%. Air enters the collector has the following properties: cp = 1000 J/(kg*K) m = 0.02 kg/s...

Hrmmm...I always forget about identities, weither it be sin / cos or in this case natural logs. Thank you foxjwill, I thought this was an easy one but I couldn't figure out how to get the correct answer, when, all along, I had it!

Homework Statement Find vz(r) Boundary Conditions: 1. vz(Ro) = 0 2. vz(Ri) = W Homework Equations (1/r) d/dr [r dvz/dr] = 0 (from previous problem) Let v = dvz / dr d/dr [r v] = 0 r v = c1 v = c1 / r vz = c1 ln r + c2 BC 1: 0 = c1 ln Ro + c2...

Wow...I did butcher it. Went back and found my mistake. Thanks!

Homework Statement Equation solved from previous problem: (g/\nu) = (1/r) d/dr [ r dvz/dr] T = \mu * dvz/dr Boundary condtions: vz (r=a) = vz (r=b) = 0 The Attempt at a Solution (d/dr)[d/dr r*vz = g*r / \nu (d/dr) r*vz = gr2/2\nu + A vz = gr2/6\nu + A + B/r I am...

Thank you Dick, I knew that I was making this stupid problem much harder then it should be put I just couldn't wrap my head around it.

Homework Statement I need to integrate this problem, I am not sure what it is but I am having trouble doing this simple problem and coming up with the right answer. Its been awhile since I had diff eq.. Solve for w as a function of x 0 = g + \upsilon (d2w / dx2) g, \upsilon =...