What is Moments: Definition and 625 Discussions

Moments (stylized MOMents) is a Filipino celebrity talk show hosted by Gladys Reyes and aired on Net 25. It is a show for mothers and kids that feature the different bonding moments, child-rearing styles and the many facets of motherhood. It airs 7pm every Saturdays with replays on Mondays to Fridays at 10 A.M and Sundays at 11:30 AM / 12:30 PM.

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  1. D

    MHB Calculating moments of inertia

    What formula do I need here?Starting from the sum $I = \sum\limits_{\alpha = 1}^Nm_{\alpha}\rho_{\alpha}^2$ and replacing it by the appropriate integral, find the moment of inertia of a uniform thin square of side $2b$, rotating about an axis perpendicular to the square and passing through the...
  2. J

    What is the principle of moments?

    Homework Statement I'm not sure on the principles of moments Homework Equations The Attempt at a Solution Is it just that moments are a turning force?
  3. alexmahone

    Moments - Balancing a weighted meter stick

    Moments -- Balancing a weighted meter stick A meter stick is found to balance at the 49.2cm mark when placed on a fulcrum. When a 46.0g mass is attached at the 14.7cm mark, the fulcrum must be moved to the 38.7cm mark for balance. What is the mass of the meter stick? I know I have to use...
  4. H

    Exploring the Significance of Higher Moments of Force in Particle Motion

    Thinking about Newton's laws, one can see that they concern the force and the torque (the first moment of the force) acting on a particle. That is enough to describe translation and rotation. But, is there something more to this? What about second and higher moment of the force? Is there any...
  5. J

    How Does Equilibrium Apply in Calculating Forces on a Sphere and Rod System?

    Homework Statement A uniform sphere rests on a horizontal plane. The sphere has centre O, radius 0.6m and weight 36N. A uniform rod AB, of weight 14N and length 1 m, rests with A in contact with the plane and B in contact with the sphere at the end of a horizontal diameter. The point of...
  6. B

    Statically indeterminate beam (fixed ends) and the moments at the supports

    I'm working through my professor's solution for this problem, and I don't understand how he comes up with the reaction force at B without taking into account the moment at B. Any help would be greatly appreciated. http://img832.imageshack.us/img832/6953/sibi.png
  7. L

    Calc 3 Moments and centers of mass

    Homework Statement Find the center of mass of a lamina in the shape of an isosceles right triangle with equal sides of length a if the density at any point is proportional to the square of the distance from the vertex opposite the hypotenuse. Homework Equations ∫∫ (f(x,y) dA mx= 1/m(∫∫...
  8. M

    Calculation of Bending Moments and beam deflection

    Homework Statement The picture of the beam below has a module of rigidity EI, determine the reactions at the supports and the equation of the deflection curve of the left half of the beam Homework Equations v*EI=((Ma*x2)/2)+((Ra*x3)/6) Ʃ of Forces in Y direction = Ra+Rb=0 Ʃ Moments...
  9. X

    Simple Moments Question with a Chest of Draws

    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 anyone 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...
  10. M

    Estimating Theta for Beta Distribution: Method of Moments vs. MLE?

    Homework Statement Let X_1,...,X_n be iid with pdf f(x;\theta) = \theta x^{\theta-1} , 0 \le x \le 1 , 0 < \theta < \infty Find an estimator for \theta by method of momentsHomework Equations The Attempt at a Solution I know I need to align the first moment of the beta distribution with the...
  11. B

    Moments of deflection/ curvature of radius of a supported beam

    I was wondering if there were any mechanical engineers that can answer a few questions I have regarding an assignment that I have been set. We have to choose a suitable beam to support a monorail. we are looking for a moment of deflection of around 10mm. Using the universal beams table bs 4 1993...
  12. C

    MHB Muffin's GCSE Additional Maths Moments Question (from YAnswers)

    Two painters of mass 50kg and 70 kg stand on a uniform horizontal plank ABCDEFG of mass 40kg and length 8m. B, C, D and E are respectively 1m, 2m, 5m and 6m from A. The 50kg painter stands at B, the 70kg painter at D and the plank's supported at C and E. Find the reaction at each support I...
  13. S

    Solving the Stick of the Gods: Mass, Center of Mass & Moments of Inertia

    Homework Statement So the problem starts out like this Stick of the Gods! You hold one end of a stick, but it has no other end. It simply extends into infinity. Its one-dimensional density distribution is given by: λ=(λinitial)times(e^(-x/L)) λ is the density The problem doesn't state what...
  14. P

    Forces and Moments acting on an entire system.

    Homework Statement The ceiling-mounted bicycle rack (shown in "Capture" image in attachments) with dimensions p = 50 mm, q = 1000 mm and r = 150 mm for a bicycle that weighs F = 200 N. The rack is to be made from two parts, ABC and BD, cut from a steel tube and then welded together at B...
  15. M

    Calculating Bending Moments with UDL's

    Homework Statement The T-beam is loaded as shown in Figure attached Find the maximum transverse shear stress at the location of the maximum bending moment. Homework Equations Forces in Y direction = 0 for it to be in equilibrium Moments about a point = 0 for it to be in equilibrium...
  16. J

    Moments of Inertia for a Cylinder and Disk

    What are they? I have some poeple telling me that for a cylinder it's I = (1/4)MR2 + (1/12)ML2 and that for a disk it's the same. Other people have told me that it's I = (1/2)MR2 for a disk and that it's the same for a cylinder. In the past I've used the former and have gotten the right answers...
  17. S

    Proving Bounds on Moments of a Random Variable

    Homework Statement For any random variable X, prove that P{X\geq0}\leqinf[ E[ phi(t) : t \geq 0] \leq 1 where phi(t) = E[exp(tX)] o<phi(t)\leq∞ Homework Equations The Attempt at a Solution I am not sure how to begin this. Any hints to get started would be greatly appreciated.
  18. H

    How Do Ladders in Equilibrium Behave When Hinged and Resting on Rough Surfaces?

    Homework Statement The image in the attachment shows two uniform ladders (red and blue) in equilibrium resting on grass(green). The distance between A and B is "L" units. The two ladders are freely hinged at C. Because the ladders are uniform their Centers of mass lie at their mid...
  19. D

    Equations and how to calculate moments and couples?

    Homework Statement A flagpole of mass 25kg and length 2.5m is held in a horizontal position by a cable at 30° from the end of the pole. The centre of gravity is 1.5m from the fixed end. Determine: 1. the tension in the cable. 2. the vertical component of the force at the fixed end...
  20. J

    Vectors and moments (Vector diagram, horizontal/vertical components, weight)

    Hello, I was solving a vector & moments question as a part of my revision and got stuck somewhere. I really need your help.. some sub-questions are solved, please correct me if I'm wrong. Here's the question (Its kinda long) : The free-body diagram shows three forces that act on a stone...
  21. T

    Which point to sum the moments?

    Homework Statement Here is the problem: Here is the solution: I am confused about part c. The Attempt at a Solution Here is my attempt at part c: I don't get why the answer key solution sums the moments about point G. I decided to sum up the moments about C and D and...
  22. P

    Moments & equilibrium of rigid bodies

    The underlined red part: I don't particularly understand where they got this from? The yellow highlight: Why are they finding the vertical distance, instead of the perpendicular distance?
  23. B

    Finding the moments of a distribution

    Homework Statement The problem is to find the moments E(X^k) of f_x(x) = (\theta+1)(1-x)^\theta, 0 < x < 1, \theta > -1 Homework Equations E(X^k)=\int_0^1 x^k (\theta+1)(1-x)^\theta dx According to Mathematica, the solution is \frac{\Gamma(1+k)\Gamma(2+\theta)}{\Gamma(2+k+ \theta )}. I...
  24. T

    Moments about different points

    Homework Statement Here is the question along with part of the solution. I am online concerned about finding the force at C. The Attempt at a Solution For my solution I decided I would sum the moments about point B. However I ended up getting the wrong answer for the force at...
  25. H

    Statics question involving moments and cranes

    Homework Statement The crane below is on level ground. The x-axis is through the contact points of the rearmost wheels with the ground, the y-axis is parallel to the front-to-back centerline, and the z axis is vertical as shown. The bed (platform) of the crane is 3 ft above the ground. For...
  26. H

    Statics question about moments

    Homework Statement Find the components of the force at D and C using moments picture attached Homework Equations M=F x r The Attempt at a Solution I'm really stuck on this one. The force from the 70 kg weight is 70*9.8 = 686N, so F=-686j. I found the moment about point C...
  27. K

    Proton vs electron magnetic moments

    For some reason I found myself wondering why we never talk about the contribution to the magnetic properties of materials due to the nuclear spins; we only ever worry about the electrons. After a short while I remembered that the magnetic moments of protons are vastly smaller than electrons (and...
  28. N

    Understanding Orbital Magnetic Moments in 1-Electron Atoms

    Hi I am reading about quantization of orbital angular momentum and, as I read, I am trying to compare it to the theory I already know on how atoms behave in magnetic fields. Here is the situation so far (I only look at 1-electron atoms to keep it simple for now): I assume the quantization...
  29. fluidistic

    Moments of the Poisson distribution

    I cannot seem to get the first moment of Poisson's distribution with parameter a: P(n_1)=\frac{a^{n_1}e^{-a}}{n_1!} when using the characteristic function \phi _X (k)=\exp [a(e^{ik}-1)]. The definition of the first moment involving the characteristic function is <n_1>=\frac{i}{n} \frac{d \phi...
  30. C

    Impedance on thin wire dipole using method of moments

    Homework Statement Write code to calculate the input impedance on a thin wire antenna using the below form of Pocklington's integral equation. Use Method of moments. Use a pulse as the basis function, point matching and delta-gap generator as the 'source'. Assume the wire is broken up into 7...
  31. J

    How Does Torque Maintain Equilibrium in a Ladder Supported by Two People?

    Homework Statement A uniform ladder AC weight 400N & length 3.5 m is held horizontally by 2 people. One person supports at A and the other at B, a distance 1m away from C. 1. Calculate the supporting force provided by the person at A. (I managed to do this one and the answer is 120N) 2. The...
  32. S

    What are some resources for understanding mathematical moments?

    Hey guys, I am trying to understand the concept of mathematical moments (as defined in this wikipedia page: http://en.wikipedia.org/wiki/Moment_%28mathematics%29), as some work I am doing relates to them. I am looking for more information to read up but when I search maths moments I get...
  33. C

    Which have unusually large dipole moments?

    There are three compounds: 1.) fulvene 2.) calicene 3.) I don't know the name of the third compound. It looks like calicene except that there is not a double bond inside of the three-membered ring. Anyways, it turns out that fulvene and calicene have unusually large dipole moments...
  34. W

    Does higher order moments means more attention to local area?

    Dear all, Sorry to post this question in this section again. I am currently looking into few static analyse algorithms. I noticed that they are analysing with different order moments or cumulants to analyse the data. I guess it is because these algorithms are focus on different aspect of...
  35. G

    Solve Moment Determining Homework for Pulley

    Homework Statement Three forces are applied to a locked pulley. Determine the magnitude and direction of the resultant of the three forces and the perpendicular distance from the axle of the pulley to the line of action of the resultant. **I'm unable to upload a photo of the pulley at the...
  36. H

    Can someone help me find the moment generating function of a random walk?

    Hi, can someone who is familiar with the analysis of random walks (statistical mechanics, condensed matter physics etc.) help me on solving a particular problem? We define the following random walk, the random variable w(t) is evolved as w(t+1)=w(t), with probability of...
  37. L

    Calculating angle from body-fixed moments on a ridig body

    Hello everyone I have some problems figuring out the correct way to calculate my rigid body angle based its local moment. I am working in R3 space. I have the rigid body local rotational acceleration expressed as a function of distance to fulfill a rigid body constraint: AlphaL = F(x,z)...
  38. S

    Determine normal stresses for pure bending moments

    Homework Statement Hi I am having tough time figuring out how to determine normal stresses σx, σy, σz using the flexure formula. All that confuses me is which moment to take for which σ. My for σx or Mz for σx and so on.. I will post an example question. In the question below, find the...
  39. S

    Helping find moments in mass-spring-ball system

    I have this mass-spring-ball system: https://dl.dropbox.com/u/1723401/massa-molla/sistema.png There is friction, but the ball only rolls. I have to find the model of the system. I started to divide the 2 systems and for mass1 I found the follow equation: m_1 \cdot \ddot{x_1} = F_k...
  40. M

    Solving 2D moments about point O

    (a) The moment the force, F, makes about O is 15 N-m clockwise, and θ = 30˚, find the magnitude of F. (b) If the force F = 100 N, determine the angle θ so the force develops a clockwise moment about point O of 20 N-m. Limit your answers to a range of 0º ≤ θ ≤ 90º. I'm a little lost can...
  41. S

    Second moments of area of a simply supported regular I beam

    I’m having trouble getting my head around this example and solution that was given as part of a revision pack for an upcoming exam. Any explanation would be gratefully received. Question: A simply supported regular I beam is 90mm wide and 120mm high. The top and bottom flanges are 10mm...
  42. D

    Maximum moments in 2-span beams

    1. How do you calculate the maximum moments in a 2-span continuous beam? 2 span beam with 2 different uniformly distributed loads (UDL) at different spans: i46.tinypic.com/2d7zpw.jpg I am a first year civil engineering student. This is apparently a statically indeterminate structure with one...
  43. E

    Taking moments about which axis?

    Why doesn't taking moments about an axis passing through point A or B work? Why must it be the center of mass here?
  44. G

    Reaction force, Bending Moments on a sub frame

    Hi, I've been working on a tubular sub frame, that I want to attach to a main frame. The attached shows the sub frame in black lines. The main fram is in purple. There are only four connection points and a force pushing down on each side. When I check for the reaction forces and make...
  45. S

    Finding force using moments problem

    Hello I am having trouble understanding a concept of what force i have found and how i can maniplate this data. I have attached image of a triangular frame which has a 10Kg mass hanging from it at one point. I know how to calculate the Force Fh using moments. i am unsure what this force...
  46. C

    What is the Moment of Inertia of a Sphere with Different Densities and Radii?

    [b]1. Sphere inner core radius 3490km and density 13000kg/m3. Outer radius 6400km and density 4000kg/m3. Show that the moment of inertia is approximately 8 x 1037kg m2. [b]2. I know that the moment of inertia of a sphere is 2/5xmr2. [b]3. I have calculated the volume for each part...
  47. B

    Calculating Bending Moments for a Supported Bar: Need Help!

    Hello all can anyone advise me if i am doing this right, i have a 3m bar supported at both ends at 1m in 5kn and 2m in 10 kn, i understood that moments A = 1x5 and 2x10 =25/3 and support A upward force 8.3kn and B 5+10-8.3 = 6.7kn? anyhelp would be great thanks
  48. T

    Moments, Cumulants, and effective action?

    Hi, I'm studying quantum mechanics and statistical mechanics, and they make heavy use of the 'correlation functions/green's functions' which are merely the moments of the distribution of some variable. I have very intuitive understanding of moments and cumulants in terms of the distribution...
  49. S

    Moments & Pendulum: Different Lengths, Same Oscillation?

    if i have two forces acting at two different angles at a same spot will the addition of the moments of the two forces be the same as the moment whereby i take the net force of the two forces and get the moment of the net force of the same two forces? is there a way to explain why for the same...
  50. B

    Deriving an equivalent system of forces and moments

    Folks, Consider a 2d disk with 2 forces ( ie a bolt pattern) acting axially ie into the page. One can easily get the equivalent force and its point of application to represent the given force system. One can do the same with an annulus, get an equivalent force and its point of application...
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