# Search results for query: *

1. ### Angle of a Complex Number

I figured it out. This is a complex number with only a real part. e.g.: cn = \frac{sin(\frac{nπ}{2})}{nπ} For even n, note that cn is equal to 0. The angle of a zero complex number is 0. For n = 1, 5, 9, ..., c = a + bj, a is 1, b is 0. arctan(0/1) is 0 degrees. For n = 3, 7...
2. ### Angle of a Complex Number

Hi all. Suppose I am looking for the following quantity: \sphericalangle cn, where cn = \frac{sin(\frac{nπ}{2})}{nπ}. cn is a complex number. According to the book, "Signals and Systems" by Edward Kamen 2nd. Ed., \sphericalangle cn = π for n = 3, 7, 11 ... , and cn = 0, for all other n. The...
3. ### Laplace Transform of a Product

Thanks for the response. After mulling it over, I've figured it out: One must treat f(t) in cos(t) * f(t) as simply any function (it doesn't matter what it is). After converting the cos(t) to exponentials (through) identities, one realizes that cos(t) affects f(t) through time-shifting...
4. ### Laplace Transform of a Product

I am given a function f(t) with it's corresponding Laplace Transform in the Frequency Domain (F(s)). I'm having a hard time wrapping my head around the product of say, L{cos(t)*f(t)}. The * is multiplication and not convolution. Must I do the integration for the Laplace transform by hand...
5. ### Fourier Transform - Completely Flustered About Recursive FFT

Thanks DeadBeef. I think this is the response I needed to hear. I've been breaking the process down step-by-step and "sentence by sentence" as you say. The study of complex analysis (or the review...) gave me some insight on how some of these optimizations work. Thanks! Will continue on...
6. ### Fourier Transform - Completely Flustered About Recursive FFT

Fourier Transform -- Completely Flustered About Recursive FFT Hi all. I have been banging my head about this problem for the last week and a half-- Fourier Transform. Some background about me: I am a rising Junior at an accredited university majoring in Computer Engineering & Computer...
7. ### Minimization of a Multi Output Circuit

Hi all. I have a 4 input circuit (ABCD). I have 7 outputs that accompany this circuit. Now, I have tools (like Karnaugh maps) to solve for Standard Sum of Products (or Product of Sum) form for individual outputs. I have the minimum of each output based on the Karnaugh map. However, I want...
8. ### Engineering KVL / KCL (Circuit Analysis)

Thanks! this makes a lot of sense now!
9. ### Engineering KVL / KCL (Circuit Analysis)

I see. Based on your chart, I may have gained some insight. Let me clarify-- so we're not supposed to use all of the resistances in the circuit? Is it correct to assume that to calculate Vab, I may simply just find the potential difference between Va and Vb? e.g.: according your chart, Vab...
10. ### Engineering KVL / KCL (Circuit Analysis)

Homework Statement Basically, find Vab [PLAIN]http://carlodelmundo.com/hw/circuit.png [Broken] Is this correct -- note: please tell me that my methodology is sound; DO NOT GIVE ME A NUMERICAL ANSWER. The problem asks for VAB. What's weird to me is that there is a potential across...
11. ### Machine Architecture vs. Microarchitecture?

Hi. I'm trying to decipher the differences between the machine architecture and microarchitecture. I believe Machine Architecture is: The ISA (such as x86) Von Neumann Model for Computing? and I believe the Micro Architecture is: Specific implementation of some arbitrary ISA...
12. ### Is the implementation of the NAND gate unique?

The reason why I asked because I couldn't decipher why a particular textbook portrayed NAND and NOR gates with a specific implementation. I wanted to make the distinction that this is only ONE way of implementing a particular gate. However, you just answered it: it is non-unique but the idea...
13. ### Is the implementation of the NAND gate unique?

I am learning about the implementations of digital logic gates using n-type and p-type transistors. With the advent of these two transistors, isn't it possible to have more than one implementation of the NAND gate?
14. ### Programming: Where can I find an ASCII Table?

You mean if I have the following txt file: 01001001 01100110 00100000 01111001 01101111 01110101 00100000 01110111 01100001 01101110 01110100 00100000 01101101 01101111 01110010 01100101 00100000 01100101 01100110 01100110 01100101 01100011 01110100 01101001 01110110 01100101 00100000...
15. ### Programming: Where can I find an ASCII Table?

Homework Statement I am given the binary equivalent of ASCII codes and I am asked to decode a particular binary message (ASCII binary to actual ASCII character). I am required to write it in C. Where can I get a text file of the ASCII code so I may create a look up table? I googled...
16. ### Resources on Electronic Packaging

Thank you berkeman!
17. ### Resources on Electronic Packaging

If I recall correctly, I am going to be packaging in the IC level. The issue of thermal heat transfer (to properly release heat from the components) was also discussed. I am assuming this is part of a trial-and-error back-of-the-envelope calculation sort of thing? Or is there really a text...
18. ### Resources on Electronic Packaging

Hi, I will be volunteering my time helping my professor in the realm of "electronic packaging." There doesn't seem to be a lot of straightforward tutorials on electronic packaging, could anyone guide me with the proper resources so I can take a look? Thanks Carlo
19. ### Series from rudin

My apologies. Please take my responses with a grain of salt.
20. ### Series from rudin

It seems complex but one can break it into pieces to simplify the problem. \sum^{\infty}_{n=0} \frac{1}{1+z^{n}} We are looking for the convergence of the series for differing values of z where possible values of z are from (-inf, +inf). Keep also in mind that n is always a positive integer...
21. ### Series from rudin

I've always thought of 'radius of convergence' in terms of power series. This is not a power series. EDIT: This answer is wrong see my below post. Upon inspection, it looks like it converges for values greater than 1 as you say (by looking at its limits for different values of z).
22. ### Maclaurin Polynomial

As you said, if you let t = cos x - 1. Then naturally you'll get r3(p3(x)). Note that you forgot to cancel out the -1 (ie: 1 + -1 = 0 when substituting t for cos x - 1). True. The expression is indeed complicated, but remember: the question asks you to write the series to the third order...
23. ### Maclaurin Polynomial

Hi estro, Here are some questions that can get you started: What is the difference between MacLaurin vs. Taylor Series? (Hint: Is MacLaurin centered at any point?) What does it mean for a polynomial to have order 3? (Hint: Look at the exponent) What is the infinite series equivalent of cos...
24. ### PNP Transistor - Amateur Question

I understand that when we apply voltage to the Base of the PNP Transistor (Emitter, Base, Collector), we actually block current from passing from Emitter to Current. If there is no voltage applied to base, then current flows freely. If this is the case... how come when I wire the...
25. ### Discrete Math; Subsets

Going a mile further... {A} is a subset of B in this example because... Every element in {A} is in B. The only element of the set of sets is A. A is the set of all integers. {A} therefore is the subset of B. ------------------------------------------------------------ {{A}} is a subset...
26. ### Discrete Math; Subsets

My question: Why are we comparing set A (the set of all integers) on an element-by-element basis? I agree that "3" is an element of A such that A = { ...,-1,0,1,0,1,2,3...}. I agree that "3" is neither the set of integers A = { ...,-1,0,1,0,1,2,3...} nor the set containing the set of...
27. ### Coverage of Calculus

Right. There is Calculus AB and Calculus BC. From what I recall from a few years ago: AB covers from Limits, Derivatives, Optimization, Newton's Method, Linearization, Related Rates, Integration + By parts, Volumes of Rotated Shapes, some Differential Equations BC covers that plus Infinite...
28. ### Discrete Math; Subsets

Homework Statement Let their be a set A, and let B be the set: {A, {A}} (the set containing the elements A and the set that contains element A) As you know, A is an element of B and {A} is also an element of B. Also, {A} is a subset of B and {{A}} is also a subset of B. However...
29. ### Rotational Motion & Energy Equation (Intro Physics)

Thanks a lot! I appreciate it!
30. ### Rotational Motion & Energy Equation (Intro Physics)

Hi StoneBridge, Thanks for your response. How do I account for the kinetic energy of the linear 'falling of the mass' when I am only given the velocity? For the right hand side of the equation, do I just include another kinetic energy term (... KE = (1/2)Mv^2) Would that account for the...
31. ### Rotational Motion & Energy Equation (Intro Physics)

Homework Statement [PLAIN]http://carlodm.com/phys/1.png [Broken] Homework Equations Energy Equation The Attempt at a Solution As shown in the scan. Is this the correct approach? I have a feeling that the velocity, v, needs to be used. I used the Energy Equation for this...
32. ### Amplitude and Perceived Loudness

Hi. If amplitude is doubled, is perceived loudness necessary doubled? If I recall correctly, we hear things on a logarithmic scale.
33. ### Identifying Spectator Ions

The original equation was pulled from an old exam of my undergrad chemistry professor. It was a little weird, so it was worth discussing. Thank you for your analysis and general helpfulness Borek. This question was a bit weird!
34. ### Identifying Spectator Ions

Here are the spectator ions: 2K+ + 2MnO4- + 10 Fe2+ + 10SO42- yields: 2K+ + SO42- + 2MnO4 + 10Fe1+ + 5SO42- + 8H2O Hmm. Interesting that I found the net ionic equation. The only ions I see that are the same are the K+ and SO42- ions. The manganate ion, 2MnO4- doesn't count because...
35. ### Identifying Spectator Ions

Homework Statement 2KMnO4 (aq) + 10FeSO4 + 8H2SO4 --> K2SO4 (aq) + 2MnO4 (aq) + 5Fe2SO4 (aq) + 8H2O (aq) Homework Equations Spectator ions don't participate in the reaction. The Attempt at a Solution What gives? Is my professor bent on making our lives miserable? The answer...
36. ### Balancing Chemical Equations Using Oxidation Numbers

No we're not required to use the ON method... but it is a tool that we are able to utilize for ugly equations such as this. Thanks for your help! This'll come handy for reviewing my Chem exam.
37. ### Balancing Chemical Equations Using Oxidation Numbers

I see. So I should balance the reactant iron first, to 2... then do the multiplications of irons by 3. I've arrived at that step but the products side still looks like a mess. Is this where I stop all "techniques" and rely on intution and trial and error to figure out the balanced equation?
38. ### Balancing Chemical Equations Using Oxidation Numbers

Homework Statement http://carlodm.com/pictures/problem.png [Broken] The Attempt at a Solution I'm stuck. Usually I balance the equation by multiplying the Fe(OH)2 and Fe2O3 by 3. However, I can no longer do this because Fe2O3 has two iron's per one molecule. Do I multiply one by...

Thanks!
40. ### Average Rate Problem

Homework Statement Support you wish to average 40 mph on a trip and find that when you are half the distance to your distance to your destination you have averaged 30 mph. How fast should you travel in the remaining half of the trip to attain an overall average of 40 mph? Homework...
41. ### Midpoint in 3 Dimensions Question (EASY)

Homework Statement http://carlodm.com/calc/123.png [Broken] My question is: Why can't we use a scalar multiple like (3/8) PQ instead of using the midpoint formula twice (to get 3/8) ?
42. ### Net Ionic Equation(s) - General Chem

Homework Statement http://carlodm.com/images/chem.png [Broken] The Attempt at a Solution The attempt is in the image. HOW IS THIS WRONG?? I've looked at it for hours now!
43. ### Calculating Total Moles of Ions from CuSO4*5H2O

THANKS! That solved my problem. For reference: the answer is .0211 mol ions
44. ### Calculating Total Moles of Ions from CuSO4*5H2O

Homework Statement How many total moles of ions are released when the following sample dissolves completely in water? 2.63 g of CuSO4 * 5H2O Homework Equations 159.611 g / mol of CuSO4 The Attempt at a Solution I tried doing 2.63 g / [159.611 g / mol] to get .016477 mol of...
45. ### Surface Area of Solid Cylinder

Homework Statement A solid cylinder with a radius of 5.0 cm and a length of 10. cm is cut in half lengthwise. What is the surface area of one of the two resulting objects? Homework Equations SA = 2(pi)(r2) + L(pi)(r2) The Attempt at a Solution Is that the correct formula? If it...

THANK YOU! That solved my problem!