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  1. C

    Integral Transform problem

    Homework Statement L[cos(at)cosh(at)] = ? Homework Equations L[cos(at)] = s/(s^2 + w^2) The Attempt at a Solution I'm able to get the solution given that is (s^3)/(s^4 + 4a^4) The question requested to use first shift property. So I used cosh(at) = 1/2[e^at + e^(-at)]...
  2. C

    Differentiate this expression with respect to x

    simplify f(x)g(x) using simple algebra properties first then only apply some log rule like log ab = log a + log b i'm not too sure if d/dx log ab = d/dx log a + d/dx log b, but you may give it a try
  3. C

    Limits on f(x) and \theta

    sin^2 4@ == (sin 4@)^2 then if u do like normal differentiation, u get 8sin4@cos4@ and with the trigo identity, u will get 4 sin8@ thus, that result would approaches 0 for @ --> 0 ps: sorry, don't know how to use the mathematical notation thingy
  4. C

    Engineering Op Amp circuit analysis

    hmm tried doing the q...do u have the answer to this q...? I got 4.8V but i didnt use any current thingy, just all on current divider rule
  5. C

    Boolean Algebra Reduction

    didnt know i can't do that, really sorry, next time will post a guided solution rather than a complete one
  6. C

    Boolean Algebra Reduction

    (x'y'+z')' +z +xy+ wz = use de morgan's law, (x.y)' = x' + y' | (x+y)' = x'.y' = take out the common factor, anything +1 = 1 = z.1 + xy = z + xy hope this helps
  7. C

    Stoke's Theorem.

    anyway...mind reedit the latex thing... can't seem to get them =_=
  8. C

    Stoke's Theorem.

    yup...sorry... the contour suppose to go from (1,1) to (0,0) thanks for the mistake pointed out :)
  9. C

    Stoke's Theorem.

    In tutorial classes, they gave a semicircle and that was quite easy to get it... but this geometrical shape triangle... is my first time trying it, and i got so say... its cracking my head (i know its simple stuff...but i really don't get where went wrong)
  10. C

    Stoke's Theorem.

    i'm not sure about the ds part as usually there is this table i would refer to, and it says ds = dxdy z_hat but ... I've also tried doing using it, i won't get the same answer. If need to integrate over a circle, transform the vector to cylindrical type and use cylindrical variables r phi z...
  11. C

    Stoke's Theorem.

    sorry... that ds suppose to have z_hat with it
  12. C

    Stoke's Theorem.

    Hi guys... I'm stuck in this question. Its not a homework nor coursework, just practice. The answer for both is the same, that is -1 ...I'm able to get (a) but (b) ... still wondering what went wrong. Please enlighten me. Thanks in advance.
  13. C

    Physical Optics : Air Wedge - Interference

    ahhh, lol a set up q :P thanks for the explanation... then what about the second solution? it seems simple but doesn't seem that right lol
  14. C

    Physical Optics : Air Wedge - Interference

    yes that equation is for the condition to get constructive interference...but for the delta m...i know it can't have the same m, but can't the first point of overlap is when delta m = 2 or 3 or so on?
  15. C

    Physical Optics : Air Wedge - Interference

    no one could help to explain ? :(
  16. C

    Physical Optics : Air Wedge - Interference

    Hi there, I was doing some past year paper of my coming exam...and I got the answers for the question too, but one part I'm totally blur and can't understand that well... well here goes all the questions and solution: http://server3.uploadit.org/files/chickens-phyQ.jpg [Broken]...
  17. C

    Coordinate Geometry question help!

    Hi there, I've been struggling with this question for days :cry: :confused: :grumpy: :yuck: , the first part where they call me to prove that equation, i could do it...the second one i don't know how to do...could anyone help me? how do i find the locus equation? its so confusing... ty in...
  18. C

    Thermal Conductivity Practical

    oh..the units are all in W m^(-1) K^(-1)
  19. C

    Thermal Conductivity Practical

    Hi there,...this isn't homework..its more to my practical...anyways...from the attachment given..that is the first page of my practical guide...the problem is...on the procedure part...it asked me to plot a graph of lg temp againts t ...if i do so...how do i get the thermal conductivity of glass...
  20. C

    Problems on Electrostatic

    i know i suspect the same thing too, same goes to (iii)..well let me confirm with my teacher firsT :P
  21. C

    Problems on Electrostatic

    hmmm alright then, then i'll ask teacher...she'll help me confirm the answer :P I'll post the right answer after teacher has confirm it :)
  22. C

    Problems on Electrostatic

    I got that answer, statusX, do u get that as well, if u do..that means the answer in the book is wrong :P
  23. C

    Problems on Electrostatic

    Hi there, I think I've done part (ii)..here goes Lets say first charge is put at A...no work is required. Second charge put at B, U (B) = U (AB) 3rd charge put at C, U (C) = U (AC) + U (BC) 4th charge put at D, U (D) = U (AD) + U (DC) + U (DB) U system = U (B) + U (C) + U (D)...
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    Problems on Electrostatic

    oOoO, statusX, u gave me some idea :D let me try it out :)
  25. C

    Problems on Electrostatic

    http://forum.lowyat.net/index.php?act=Attach&type=post&id=46273 [Broken] Hi there, I've been trying this question quite long but I do not get the answer, could anyone help me? For part one, i got the answer... part (ii) ... i saw it in a book saying i suppose to choose a point to get...
  26. C

    Need help in this physics question

    Yes I do understand that formula. But in c(ii), it wants the speed at which the ball strikes the block. During a very short period, the ball will touch the block eventhough its a elastic collision...so that's why i assume mu^2 = (m_{1}+m_{2})v but i really don't know if that's correct.
  27. C

    Angular Velocity and Angular speed ?

    I have a book that gives a formulae Angular Speed as same as the Angular Velocity...is that true? From what i understand, speed is a scalar quantity...so it only have the magnitude value while velocity is a vector quantity which also shows the direction. Also, will the average angular...
  28. C

    Need help in this physics question

    Oh, let's see, Q a )Work - The work done by a constant force F when the displacement of its point of application in S is given by the scalar products of F and S. Energy - Energy enables a body to do work. I also did b (i) (ii), c (i) ...after that I'm stuck on the following...
  29. C

    Need help in this physics question

    Do help me in the question below. Thanks in advance. http://forum.lowyat.net/uploads/post-68-1089800451.jpg [Broken]
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