Recent content by kougou

Homework Statement I am trying to understand the question: An urn contains n red and m blue balls. They are withdrawn one at a time until a total of r(r≤n) red balls have been withdrawn. Find the probability that a total of k balls are withdrawn. The solution is given as, Sample...

Hi all I am trying to understand the concept of 3 phase wound rotor induction motor. I understand why when you feed in 3 phase current to the stators that are separate spatially 120 degree will get you a rotating magnetic field. However, I am having much trouble in understanding the...

Homework Statement The short circuit time constant method for determining 3dB point for high pass filter says b1= the sum of short circuit time constant seen by each individual capacitor with the all other capacitor replaced by short circuit. b1 is also = the sum of pole1, pole2...

[URGENT! Stopping Potential~~~~~~~#######~~~~~~~~~~~~~~~~ Homework Statement max Kinetic_energy= e*Vs=hf-work_function Vs is the stopping potential The attempt at a solution I am wondering, does this stopping potential refers the voltage difference of V_Emitter (where the...

Homework Statement I am wondering, what happens to those photons ( all having same energy level) in a light beam when the photons don't have enough energy to release the electrons in the metal that are more tightly attracted? Does the overall work function of the material decrease...

offcourse, but I am struggling with this concept of shifting. But I believe the answer should be A. since x3[t] is the compression version of x2[t], which is the shift version of x1[t]. So the overall transformation would be x3[2(t-2)], which does not correct.

Homework Statement If x2[t]= x1[t-2] and x3[t]=x2[2t] What is x3[t] in terms of x1[t]? a) x3[t]= x1[2(t-2)] b) x3[t]= x1[2t-2] Homework Equations which one?The Attempt at a Solution offcourse, but I am struggling with this concept of shifting. But I believe the answer should be A. since...

ok. I see. This question might be too simple for all \ or you guys wouldn't even bother to explain such simple question?

Homework Statement Hi all. I am having trouble to understand the combination of transformation on a function: h(x)= a*f(b(x-c))+dHomework Equations The problem I am struggling with is the order of transformation; I do see that: f(x-c) is translation in the right since every event happen before...

Hi all If I want to volunteer in the research lab in the summer, how should I contact the professor to inquiry about this opportunities? I am an undergraduate electrical students, and I am interested in the the signal processing and data communication. However, I don't have any related...

Hello guys I am from UBC, Canada, eletricial engineering. After second year, we are currently declaring options: two in my particular interests are "biomedical engineering" and "nanotechnology & micro-system". I have already investigated about the courses offered by these two options. But I...

any suggestion? is this question too broad or what?

Hello I am a undergrad electrical engineering student. I took two courses on C before. With C, this seems to be not enough because I am hoping to help out in some engineering related research project at school. Currently, I have no idea what type of research I am looking for. I am just...

Homework Statement Use spherical cords to compute area of a disk, that's center at x,y=0, and z=4, having a radius of 3 Homework Equations I set up a triple ∫∫∫ (r^2* sin(theta)), running from phi =0 to 2pi, theta=0 to arcsin(3/5), r=5sin(theta) to 5. The Attempt at a Solution It doesn't...

Thank you "by solving f1 and f2, to get f3" what I meant is to get another equation f3, from f1 and f2. And f3 describes the values of the intersection