# Search results

1. ### Most practical specialization in mechanical engineering

Hello everyone, I was wondering what is the most practical/hands on engineering specialization in mechanical that would not require someone to stay in front of a computer 8h a day, 40h a week because that is what I've mostly been doing at my internships so far (CFD simulations, excel, tecplot)...
2. ### Need help with laplace

Sorry I am just trying to be consistent with the problem statement. Maybe I posted in the wrong forum (although my question is related to Laplace and not the circuit itself), maybe a moderator can move this to Homework & Coursework Questions > Engineering, Comp Sci, & Technology ? Thanks.
3. ### Need help with laplace

Homework Statement Homework Equations For a capacitor: i=C(de/dt) The Attempt at a Solution Using Kirchhoff's current law at the note above the resistor R2 I get the following equation, which I believe is right: C(e0' - ei') + (e0 - ei)/R1 + e0/R2 = 0 Then, since the source has a...
4. ### Machine element design

Hello, I am looking for a good source of information about design of machines (static failure, fatigue theory, design of shafts and keys, spur gears, etc..). Maybe some free online material or lecture notes? It seems like a fairly difficult course but I could find very few information so far...
5. ### First moment and transversal shear

Homework Statement [PLAIN]http://img823.imageshack.us/img823/6601/unledpicturex.png [Broken] Homework Equations q = \tau/b \tau = (VQ)/(Ib) I would like to calculate the shear flux in one row of nail. By taking the first moment for the upper board, calculating q and dividing by 2 I...
6. ### Dynamics: half-cylinder rolls without sliding.

Homework Statement [PLAIN]http://img62.imageshack.us/img62/6531/capturefma.jpg [Broken] Homework Equations Conservation of energy principle T1 + \sum U1-2 = T2 The Attempt at a Solution I have the correct answer for part a). T1 = 0 (since the system starts from rest). T2 =...
7. ### Dynamics: rogid bodies force and acceleration

Thank you very much tiny-tim! It is very clear now.
8. ### Dynamics: rogid bodies force and acceleration

Homework Statement [PLAIN]http://img135.imageshack.us/img135/1063/1763o.jpg [Broken] Homework Equations IG = (1/12)ml^2 \sum Ma=(IG+m(rG)^2) The Attempt at a Solution I take the moment about A, which gives me the following...
9. ### Probability question

Thank you, I believe you are absolutely right. I am fairly new to probability as you can see.
10. ### Probability question

Homework Statement A multiple-choice quiz has 200 questions each with 4 possible answers of which 1 is correct. What is the probability that guesswork yields from 25 to 30 correct answers for 80 of the 200 questions. [HINT: approximation may be helpful here] Homework Equations Binomial...
11. ### Permutation problem

Homework Statement If the class contains 7 mechanical, 6 civil and 5 electrical and we require that the 9 individuals who give their presentations on day 1 must include 3 mechanical, 3 civil and 3 electrical, how many different orders of presentation are there for day 1? Homework...

13. ### Programming in mechanical engineering

Hi, I have a general question related to the mechanical engineering profession. I am a second year mechanical engineering student and I also have a college degree in computer science, my skills are mainly C/C++ programming and networking/Linux environment (system administration). I love...
14. ### ODE Euler-Cauchy

I don't understand why you can do that. I though that since a8=a2/192, then we will have (a2/192)*x^8 in the answer, but in your case we would have (a2/384)*x^8. Why is there a multiplication of the denominator by 2, and where does it come from? Thanks again for taking the time to answer...
15. ### ODE Euler-Cauchy

Got it, thanks a lot tiny-tim! For those that might be interested, you have to make the substitution u=y' and then use separation of variables. Another question if you don't mind, would it be possible to solve this problem using power series? I have to admit that I don't really understand...
16. ### ODE Euler-Cauchy

Homework Statement Find a general solution of the differential equation xy'' − (1 + x2 )y' = 0. Homework Equations Euler-Cauchy general form : xnyn+xn-1yn-1 ... +y=g(x) The Attempt at a Solution At first I tried using Euler-Cauchy but by multiplying by x (to get the x2 in front...
17. ### Line integral problem

Thanks Mark44, I corrected the mistake in the first post. I will come back to this thread if I find an answer and post it.
18. ### Line integral problem

Homework Statement Evaluate the following line integral on the indicated curve C \int(y^2-x^2)ds C: x = 3t(1+t), y=t^3 ; 0 <= t <= 2 Homework Equations ds = \sqrt{(f'(t))^2+(g'(t))^2}dt The Attempt at a Solution dx/dt = 3+6t dy/dt = 3t^2 ds = \sqrt{(3+6t)^2+(3t^2)^2}dt ds =...