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  1. D

    Differential Equation answer help

    also, i hope someone could explain to me how to determine if a differential equation is linear or non-linear.
  2. D

    Differential Equation answer help

    the question and after the equation is separated (see p1.jpg) p.s. y(0)=pi/2 ( i typed it wrongly. sorry) i could not get the right answer. suppose the answer should be (see p2.jpg) pls help. I am quite confuse with the integration actually.
  3. D

    Surface integral : sphere

    yes. i did it and i get 4pi can someone help verify the answer? TQVM.
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    Surface integral : sphere

    i think we are not allowed to use divergence theorem for this question because divergence theorem will only be taught in the following sub-chapter
  5. D

    Surface integral : sphere

    [PLAIN]http://www.mrnerdy.com/forum_img/dont%20know.JPG [Broken] what do i need to do next to find the surface integral btw the planes z=1 and z=2? or is there anything wrong that i did?
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    Green's theorem question

    thank you very much, galileo
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    Line integral question

    tq. i'll try to check back this question later.
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    Green's theorem question

    http://www.mrnerdy.com/forum_img/whichcorrect2.JPG [Broken] which one is correct? [PLAIN]http://www.mrnerdy.com/forum_img/whichcorrect.JPG [Broken] i tried both, and both gives different answer. one is 19/20 and another is 7/60
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    Line integral question

    i get 7/6 but when i follow galileo's advice, i get 7/3 please help me verify again. TQ.
  10. D

    Line integral question

    thank you very much, eok and galileo!
  11. D

    Line integral question

    http://www.mrnerdy.com/forum_img/ask.JPG [Broken] is the first stepc orrect? TQ.
  12. D

    Double integral

    no. only given that equation.
  13. D

    Double integral

    so, does it represent a plane instead?
  14. D

    Double integral

    http://www.mrnerdy.com/forum_img/mq1.JPG [Broken] from the equation given, i change it into f(x,y). how can i obtain the region of integration for x and y? thank you.
  15. D

    Just help me to check homework on vector calculus

    sorry. changed it to jpeg. :)
  16. D

    Just help me to check homework on vector calculus

    just help me to check homework on vector calculus :) Find the equation of the normal vector, tangent plane, and the normal line to the graph of the equation at point P. here's the equation and my solution: http://www.mrnerdy.com/forum_img/p1.JPG [Broken]...
  17. D

    What do you mean by direction cosine

    what do you mean by "direction cosine" i've just came through this term, and may someone please help clarify what does it mean? tqvm.
  18. D

    Does175kohm resistor exist?

    if not, what resistance is the closest to 175kohm? tqvm.
  19. D

    Engineering Common emitter amplifier circuit using feedback biasing

    i don't have the basic of analog, but i tried to look for in the books. unfortunately, the books are using voltage divider biasing instead of feedback biasing. i have a circuit like this: http://www.mrnerdy.com/forum_img/BJTampfeedbackbiase.jpg would anyone tell me the flow of the current in...
  20. D

    What's the difference btw double and triple integrals

    i got the answer -30 is it correct?
  21. D

    What's the difference btw double and triple integrals

    tq. i want to ask another question: is it possible to find the volume of the solid by double integration, if only one equation is given x/3 + y/4 + z/5 = 1
  22. D

    What's the difference btw double and triple integrals

    i read both double and triple integrals can be used to find the volume. so, what's the difference?
  23. D

    PSpice DC Sweep Analysis

    i know how to set up the DC sweep analysis, but what is it actually for? i see both axes are voltages. like transient analysis, i know exactly what it is for. it shows a time-domain voltage simulus. hope for a brief description on it. thank you very much.
  24. D

    Confused with double integral

    i got confused again. do you mean (-2,9)??
  25. D

    Confused with double integral

    Oh, thank you, TD!
  26. D

    Confused with double integral

    given f(x,y) = x-y R is a triangle with vertices (2,9), (2,1), (-2,1) then i need to find I, I = int. int. (x-y) dx dy i was taught to use this range when i do the dbl. integration 1 <= y <= 9 (y-5)/2 <= x <= 2 i want to ask, why can't i use this range: 1 <= y <= 9 -2...
  27. D

    Floating point number - verify please

    tq. btw, i just found this in the internet. # Infinity is encoded when the exponent field is all 1’s and the mantissa is all 0’s. # If the exponent contains all 1’s but the mantissa does not contain all 0’s, then this is referred to as NaN or Not a Number.
  28. D

    Floating point number - verify please

    sorry. it should be right, not rite. pardon me. from your statement, i conclude that the exact answer should be infinity. am i right? what if, i have this floating point number : 11111111100000000000000000000000 and i am to convert this floating point number to decimal, the answer should...
  29. D

    Floating point number - verify please

    if the floatingpoint number is 1111111111111111111111111111111, the answer should be NaN instead of infinity rite?
  30. D

    Finding the volume with Shell method

    thank you, but I am a bit confused. im doing some self-study here, and the formula they wrote in the book is what i wrote in the first line. btw, the x-axis is the axis of rotation. nvm. i try to figure it out again :)
  31. D

    Finding the volume with Shell method

    the volume that i get is a negative value, there must be something wrong with my working. is shell height = y + 2 - y^2 or i am wrong? tq.
  32. D

    Center of mass

    thank you got it! thanks!
  33. D

    Center of mass

    i don't understand how can the center of mass = (L/4, L/4) the hint is provided. based on the hint, i would write the answer is (L/2, L/2) :confused:
  34. D

    How to obtain 4 input or gate using 2 input gates?

    hi. thank you. i am thinking of that way too but wouldn't that require 3 get instead of 2?
  35. D

    How to obtain 4 input or gate using 2 input gates?

    how can i obtain 4 input or gate using 2 input gates? :confused: any help will be appreciated.
  36. D

    Using excel to determine equation.

    and another question, i have data from day 1 to day 21. how can i get the extimated value for day 30 with excel? any help will be appreciated.
  37. D

    Using excel to determine equation.

    i already enter the data, and then obtain the curve graph for the data. how can i obtain the equation of the curve from excel?
  38. D

    What is material background?

    i need to write a report about the background material of a certain project. i am not good in english, so can anyone explain what exactly is needed? thank you.
  39. D

    Why there is mass defect?

    why there is mass defect in a nuclide? thank you.
  40. D

    Im so confuse with nuclide, nucleus etc

    can someone help to differentiate all these terms nuclide nucleus nuclei
  41. D

    Electrical conduction

    thanks ehild.
  42. D

    Electrical conduction

    figure show 2 ways how 2 thin nichrome wires P and Q at fixed p.d. V are connected. Both P and Q are of the same length but the diameter of wire P is bigger than that of wire Q. When wire P and Q glow steadily in both circuit, which on of the following shows the comparison of brightness between...
  43. D

    What is ramp voltage?

    i don't know if this is a stupid question to ask, but i really need to know what it means by ramp voltage?
  44. D

    Hall Probe

    alrite. thank you.
  45. D

    Hall Probe

    i've look for the picture that shows the structure of HALL PROBE to complete my notes, but fail to find any clear diagram. just hope that if any of you have a clear diagram on Hallprobe, hope can tell me. thanks in advance.
  46. D

    Pls help check my answer for this probability question.

    the lifespan of a species of plant is a random variable T ( tens of days ). the probability density function is given by f(t) = { (1/8)e^(-t/8) , t > 0 { 0, otherwise (i) find the cumulative distribution function of T and sketch its graph i get this answer F(t) = { 0, t <...
  47. D

    Help solve this probability question

    probability question. pls help to check im sorry. i still not able to solve it. can u show me ur whole working.. sorry..
  48. D

    Help solve this probability question

    thanks. i have try first.
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