yes the 360 N for part b) is correct. Drawing the free body diagrams helps keep the signs of the terms correct. For the elevator the forces are (assuming up is positive) cable tension up (positive), weight of elevator + passengers down (negative), and friction force on elevator down (negative)...
Refer to the following explanations: ("electrical speed" means electrical AC frequency)
https://www.emetor.com/glossary/mechanical-speed/
http://en.wikipedia.org/wiki/Induction_motor
I've taken all the courses you mentioned (changed major many times trying to decide on a career). You need to check with your university on course prerequisites and corequisites. Generally Physical Chemistry only requires basic chemistry semesters (2 or 3 classes). Mechanical Engineering Thermo...
Everything is fine except going from second to last step from your answer to the following step.
Integral should be of (- (sint)^3 + sint + (cost)^2) dt
This will give you the correct answer.
In this problem we are to derive the electric and magnetic fields at any point P away from an infinite straight wire carrying a constant current I0.
Generally, E = -∇V - ∂A/∂t and B = ∇ x A
Since the wire has equal positive and negative charges, V = 0 everywhere outside the wire. Once we...
your excel spreadsheet is incorrect
you should be calculating a DFT (which is the harmonic amplitude) for each k value per the formula they told you to use
the α,β values were used to determine the applicable k values they wanted you to use evidentally (which i am very skeptical of initially...
The following summary addresses how:
http://www.fpv.umb.sk/kat/kf/Integrovana_prirodoveda/TG/Zvuk/Zvuk_kmitanie/www.me.psu.edu/me82/Learning/FFT/FFT.html
Your intuition and majority of statements are accurate, just a little variable terminology confusion:
U = u i + v j + w k
For your example: 0<= u <= V where V = wall velocity; v = 0; w = 0
Therefore ∂v/∂x = ∂v/∂y = ∂v/∂z = 0 and ∂w/∂x = ∂w/∂y = ∂w/∂z = 0
∇ dot U = ∂u/∂x + ∂v/∂y + ∂w/∂z = 0...