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  1. N

    Poisson distribuition

    [This is misleading, since the probability is never 0, although it can be vanishingly small compared to the probability of 1 event. ] "Mathman", I dont really understand what do you mean since it's different way of explaination from "statdad". Can you explain some more? thx..
  2. N

    Poisson distribuition

    The explanation for the Poisson distribution in reference book is " when given an interval of real number, assume events occur at random throughout the interval. If the interval can be partitioned into subintervals of small enough length such that 1. the probability of more than 1 event in a...
  3. N

    Frequency and viscous friction in a spring?

    your equation is right if not consider the viscous friction, but since it must consider the friction, so how arh?
  4. N

    Frequency and viscous friction in a spring?

    Hi. may i ask the relationship(formula) between frequency and viscous friction in a spring?
  5. N

    Spring constant

    err.. u mean should post in subforum "general phy", izit? Actually this question is related with differential equation, so i just post at here.
  6. N

    Spring constant

    hi.. may i ask what is the relationship(formula) between the viscous friction and the frequency? if i know the value of k(spring constant), M(mass), and f(frequency), am i able to find out friction coefficient, b?
  7. N

    Reverse the order of integration

    erm..draw de picture.. how about if i don't know how to draw it? can teach me any method to find the new limit?
  8. N

    Reverse the order of integration

    why sometime we need to reverse the order of integration? and how to determine the new limit? for example: for integration of dydx, the limit of y and x: y=2x , y=2; 0<=x<=1. after we reverse the order become dxdy, how to determine the new limit of x and y?
  9. N

    Line integral

    HallsofIvy, ya.. i missunderstand already.. :p Well, now i understand it.. thanks to elibj123,Redbelly98, HallsofIvy for helping..
  10. N

    Line integral

    Erm.. ok.. Let say, integral ( x^2 + y + z)ds , the line segment of curve is from (0,0,0) to (1,2,1). We parameterize curve C by x=t , y=2t , z=t. As you said, t should be between 0 and 2. but according to my reference book, 0<=t<=1. Why?
  11. N

    Line integral

    what is the different between line integral and surface integral? If we parameterize curve by x=t , y=t , what is the range of t ? Is it 0<= t <=1? why?
  12. N

    Can explain to me what is mean of span?

    "span" is still obscure to me. but in overall, im more nearer to it. your explaination really useful. thank you. ^^
  13. N

    Can explain to me what is mean of span?

    the smaller set in R^2 is {<1,0> , <0,1>}, this set "spans" entire R^2, correct? how can span related to linear independence of the set of vectors, S in a vector space, V ? if the set of vectors, S is "linearly independent or linearly dependent", then S "must" be a span of V. or should say...
  14. N

    Can explain to me what is mean of span?

    can explain to me what is mean of span? from book, it say "every vector in the space can be expressed as linear combination of the vectors, then it called the span of vector." but i still cant catch its meaning and concept.
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