moments

  1. G

    What is the total summation of moments at A ?

    What is the total summation of moments at A? I tried \sum M_{A} = F.(d+d` )-F(d+d` )-F.d I am getting negative answer.
  2. C

    How to calculate the moments of a new pdf?

    Hello! I have developed the PDF (probability density function) of a new distribution. I want to calculate their moments (mean, sd, skewness, kurtosis). How can I do this? Consuli
  3. K

    Lebesgue-Stieltjes integrals, lower partial moments, probability distributions

    Working through a lecture in performance management course (topic about downside-oriented risk measures and lower partial moments), I have encountered several expressions of the following form: LPM(2,t)(R)=integral((t-R)^2dF(R))=E[(max{t-R;0})^2] where F(R) is the cumulative distribution...
  4. S

    Magnitude and sense of the force applied at A to reduce the reaction at A to zero.

    Magnitude and sense of the force applied at A to reduce the reaction at B to zero. A light horizontal beam $AB$, of length $9m$, supported at its ends by a force $S$ acting vertically and a force $R$ acting at an angle $\alpha$ to the line of the beam. A force of $30N$ is applied to the beam...
  5. H

    moments & forces with spring balance

    Hello All see the image of the caravan .if it is attached to a car, the caravan according to the safety regulations should exert a force of 690 N (6,9x 100 N) exerting downward on the car's tow hitch. Before the person fastens the caravan, he checks the magnitude of the force by holding...
  6. H

    moments and force

    sam makes a punch hole with the perforater( two holes ). She presses the lever at A down with a force of 40 N. Calculate the total force which a single pin presses on the paper. 2. Relevant data http://s6.postimg.org/yx62wbild/image.png 3. The attempt at a solution would it be : 40 N X...
  7. H

    moments with balance

    Hi All one elementary question foxing me to help my kid with his issue: the plank has a length of van 60 cm. There is this block of 100 gms placed at the end of the plank. The shelf will tilt at the point when the block(100gms)is pushed to the front by 20 cm from the edge. Calculate the...
  8. T

    Moments of a crane

    I do not know at all how to even apporach this question. I don't know what point to take the moments from, where the pivot is, I just don't know how to find the weight without l and d. I have the following equation for moments: FL = Fdsin(a) and so L = dsin(a). Help please!
  9. V

    Basic Shear and Moments Clarification

    This is the problem https://gyazo.com/f4e487b73d118782da62642a3445e6f2 This is the sum of moments https://gyazo.com/e74c95c8c14e098e121e759a60556a9b And these are the moments at CD https://gyazo.com/bff9463104495a24211a4eeb0e8cf086 The 4800 is positive because it goes anti-clockwise, right...
  10. S

    Question about a g-force simulator in question 6, part b.

    The following is regarding question $6$, part $b$, in the following link: https://thol.sunway.edu.my/examdbase/alv/math/p3/math_p3_j96.pdf Using the principle of moments and considering the case when $ω=0$ (when the system is at rest). Let $m_1$ be the mass of the pilot, $m_2$ be the...
  11. S

    Mechanics: Moments of forces, weight and tension.

    A hoop of weight 20 Newtons can rotate freely about a pin fixed in a wall. A string has one end attached to a pin, runs round the circumference of the hoop to its lowest point, and is then held horizontally at its other end. A gradually increasing horizontal force is now applied to the string...
  12. A

    Free Source Code for moments of path integrals of a Stochastic Process

    Now you can download the free C++ source code for the numerical method in this paper that I have attached to the Wilmott thread. Wilmott Forums - Solution of Stochastic Volatility Models using Variance Transition Probabilities and Path Integrals You can download the original paper here...
  13. C

    Ref: Proof of non-central moments of the normal distribution

    Hi, I am currently reading through an article where they using the noncentral moments for the normal distribution (and actually also the chi-squared distribution), but what i need to know is how these non-central moments has been determined. I have tried googling the answer without luck. In most...
  14. C

    Ref: Proof of non-central moments of the normal distribution

    Hi, I am currently reading through an article where they using the noncentral moments for the normal distribution (and actually also the chi-squared distribution), but what i need to know is how these non-central moments has been determined. I have tried googling the answer without luck. In most...
  15. T

    Using moments of inertia to find the heights of objects

    Hi guys! Just need a little bit of help with this practice problem. Consider a solid cylinder of radius R, a cylindrical shell of outer radius R and inner radius A, and a spherical shell with outer radius R and inner radius A. All three objects have the same constant density. Find the...
  16. K

    Please help, Third moments matrix

    Hi this is my problem Matrix A = x11 x12 x13 x14 x15 x21 x22 x23 x24 x25 x31 x32 x33 x34 x35 Then I need to find matrix of second moments and third moments, so I did Matrix B = x11-?1 x12-?1 x13-?1 x14-?1 x15-?1 x21-?2 x22-?2 x23-?2 x24-?2 x25-?2 x31-?3 x32-?3 x33-?3 x34-?3 x35-?3 Since...
  17. K

    Third moments matrix, Please.

    Matrix A = x11 x12 x13 x14 x15 x21 x22 x23 x24 x25 x31 x32 x33 x34 x35 Then I need to find matrix of second moments and third moments, so I did Matrix B = x11-?1 x12-?1 x13-?1 x14-?1 x15-?1 x21-?2 x22-?2 x23-?2 x24-?2 x25-?2 x31-?3 x32-?3 x33-?3 x34-?3 x35-?3 Since variance-covariance...
  18. X

    Simple Moments Question

    Hello, My friend and I have been having a discussion about moments (when applied to a chest of draws). The argument is; if the weight in each draw is the same, and any one draw is opened fully, will a draw higher up be more likely to cause the chest of draws to tip forwards, or are they all...
  19. J

    Method Of Moments Help

    Hi all, Just a question i have no idea to do, got an exam next week so was wondering if anyone can take me through the steps? [attachment=0:1qdiehk8]Screen Shot 2012-08-11 at 01.57.37.png[/attachment:1qdiehk8]
  20. L

    Moments,Center of Mass, & Centroid

    So this is my work x=-y <-- g(y) x=5y-y^2 <----f(y) a=0 b=6 *note I don't know how to put 0 to 6 on the integral m=p ? [(5y-y^2)-(y)]dy =p [3y^2 -(y^3/3)]= 36 p My= p?[(5y-y^2)+((-y)/2)][(5y-y^2)-(-y)] =p/2? (4y-y^2)(6y-y^2)dy =p/2? (y^4-10y^3+24y^2) dy = p/2 [(y^5/5)-(5y^4/2)+8y^3]...