Moments Definition and 626 Threads

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. L

    Distribution of sum of moments

    Suppose there is a horizontal beam with length 1. There is a pivot at distance \alpha from the left end of the beam. The beam is held in place, and n weights are placed on it. The positions of the weights (x1,..,xn) are independent and drawn uniformly from the interval [0, 1]. The beam...
  2. Q

    Dipole/quadrupole moments of wires in x-y plane

    Homework Statement Two identical, infinitely thin, homogeneously charged cylinders (length L) are placed in the xy plane and form an angle phi (so that they make a V shape). Calculate the angle phi, for which the dipole contribution to the electric field potential at (x0,0,0) is exactly...
  3. B

    How to Calculate the Atomic Magnetic Moment of Nickel in Bohr Magneton?

    Homework Statement Calculate atomic magnetic moment of Ni in Bohr magneton. Given that atomic weight is 58.69, density is 8.91 g/cm^3 Atoms/moments are fully aligned in the field direction and have magnetization of 4.84 x 10^5 A/m Homework Equations The Attempt at a Solution...
  4. U

    Solve Moment Problem: Weight of Bar = 350 N

    1. A heavy uniform bar is in equilibrium in the arrrangement shown (I cannot upload the picture, but the bar is resting on a pivot with two weights at either end. 1.5m to the left of the pivot with 1000N weight at the end. 4.5m to the right of the pivot with a 100N weight at the end) Question...
  5. D

    What are the common challenges in determining the direction of couple moments?

    Homework Statement This is not a specific homework question, but it is a coursework question. I am having trouble with determining the direction for the moment of a couple. I understand that with couples in general, there is a force negative and a force positive separated by some...
  6. F

    Skimming Boom Design, Material Selection & Bending Moments, Agri Mech.

    I'm currently studying Agri. Mech. Eng but I need some help on this, I know roughly what to do but it's where to start: 1. Design a skimming boom for a biomass slurry transfer tank which can have a reach of 7.5m. Tool must attach to a "quick hitch" plate - factory spec for the loader is...
  7. H

    Calculate the moments Mx, My and the center of mass

    Homework Statement 2. The attempt at a solution I'm working on #49 ONLY. I know the top line equation is f(x) = x but I need to find the g(x), so how can I find with the point is given (4,3). Please help!
  8. X

    Turning effect of force (Moments)

    My previous post has been removed due to some reasons. I would like to ask another question: if a uniform metre ruler with weight of 1.2N, suspended at its mid-point from a spring balance. No other force is added to the ruler. The reading on the spring balance is 1.2N. Am I right? If...
  9. B

    What are the coordinate direction angles for the resultant couple moment?

    Homework Statement [PLAIN]http://img25.imageshack.us/img25/5139/physicsproblem.jpg If F1 = 110 lb and F2 = 300 lb, determine the magnitude and coordinate direction angles of the resultant couple moment. Homework Equations MR = \Sigmar x F, M = Fd The Attempt at a Solution...
  10. P

    Determine Resultant Force-Couple on T6 Vertebra at F2

    Homework Statement A chiropractor applies a thrust to the spinous process of T6. The magnitude is 400 N and it is applied 90 degrees to the y-axis. While this occurs the superior disc applies a force to the T6 body of 615 N, 75 degrees to the x-axis. The inferior disc applies a force to...
  11. B

    Having trouble with this Moments about the coordinate axes problem

    Having trouble with this "Moments about the coordinate axes" problem! When a force F is applied to the handle of the valve shown, its moments about the x and z axes are, respectively, M_x= -77 lb ft and M_z= -81 lb ft. For d=27 in., determine the moment M_y of F about the y axis...
  12. B

    How do I solve this statics problem involving moments and finding angles?

    Hey guys I'm having trouble with this simple statics problem. http://img443.imageshack.us/img443/7218/37statics.png [PLAIN]http://img841.imageshack.us/img841/6734/372.png My set up. [PLAIN][PLAIN]http://img543.imageshack.us/img543/9349/ya1x.jpg I'm confused on where I'm...
  13. S

    Moments / torque etc ( gravity is considered ? )

    The whole point is whether gravitational pull is taken account in moments ? Homework Statement The apparatus below is set up on Earth. It shows a piece of soft iron X of mass 0.6kg fixed on one end of a uniform beam AB which is pivoted at its midpoint. X is prevented from being pulled down...
  14. T

    Turning Effects of Forces ( principle of moments )

    Homework Statement a uniform rule has a mass of 90g and its centre of mass is at the 50cm mark. the ruler is suspended by a thread at the 70cm mark, balanced by a mass of weight W hanging from the 80cm mark. Calculate the moment of the weight of the ruler about the 70cm mark. What is the...
  15. Y

    Forces and moments in a hole puncher

    What are the forces and the moments of the hole puncher when a load is applied? The only idea here is a hole puncher is a second class lever.
  16. M

    Basic IR Spectroscopy and dipole moments

    Hi Why does a bond stretch or vibration have to cause a change in dipole moment to be IR active? Presumably all vibrational modes depend on energy aborption to occur whether they cause a change in dipole or not. I'm presuming that only those vibrational modes that cause a dipole change are...
  17. M

    Fixed end moments is it WL^2/12 or WL/12 ?

    Homework Statement Hello Every one, well i have a question regarding the Fixed End moments, if we had a Horozontally Fixed End supported Beam, with equally distributed load (W) on the beam, and we require the moment at the fixed Ends, which Equation would i use: Homework Equations 1...
  18. U

    Moments of Inertia Derivation,

    Homework Statement I have attached the problem in one file and I have attached my attempt in the second file. I only need help deriving the moment of inertia for the first (1) and fourth (4) objects but I have attached my solutions to the other objects in case it helps jog someones memory...
  19. pellman

    Etymological link between moments and momentum?

    What is the common origin of the terms: (1) "moment" as in "moment of interia" (2) "moment" as in the math terms first moment, second moment, etc. (3) "momentum"? The first two are somewhat easy to see, though I'd like see someone familiar with it spell it out. But I've always wondered...
  20. L

    Solve "Moments of Force" with Uniform Meter Rule & Pulley

    Homework Statement A uniform metre rule of mass 100 g is supported by a knife-edge at the 40 cm mark and a string at the 100 cm mark. The string passes round a frictionless pulley and carries a mass of 20 g as shown in the diagram. At which mark on the rule must a 50 g mass be suspended...
  21. D

    How Do You Calculate Reaction Forces in Force Diagrams?

    1. 1. Homework Statement Ok. I'm given a force diagram, and I have to figure out the reaction forces at the two points on the ground. answer key: (498.1N↑; 104.2N→, 92.8N↑) Homework Equations Ok. I only got so far as the x-reaction force at the pivot... 600 sin 10 = <- 104.2N...
  22. P

    Stark effect and electric dipole moments

    One excersise of my current homework for experimental physics (Ba, 4th term) is giving me troubles, because I have no idea where to start. Excersise: Stark effect: Calculate the electric dipole moment for the interference of 2s and 2p (m=0) states (hydrogen). The wave functions are given...
  23. W

    Exploring the Concept of Couples and Moments in Physics

    Can anybody tell me what a couple is. From what i gather it is when two forces are equal, opposite and parallel. But but if 1 force is bigger than the other say a 2 and a 3N force could it be said that there is a couple of 2N forces ? Does it have anything to do with moments? __________ Daniel
  24. V

    What are some limitations and fixes for a Physics ISA experiment on moments?

    We need to think of limitations regarding an experiment we did as a practice Physics ISA regarding moments, and how to overcome the limitations. I can only think of a couple limitations, but we need 5, any ideas? Experiment: Using a 1m rule attached to a clamp by a nail (nail is a pivot) and...
  25. 0

    Principle of Moments: Balancing a Meter Rule

    Homework Statement A metre rule is balanced at the 50 cm mark. If a mass of 5kg is placed 40 cm from the pivot at one end, what mass must be placed 30 cm from the pivot on the other end to balance the rule? Homework Equations M1 * G * D1 = M2 * G * D2 The Attempt at a Solution...
  26. H

    Learning moments in statics currently

    Skip to the bottom for the short version... We are learning moments in statics currently, and I have a problem that asks me to resolve the force given into x and y components, then, using "the principle of moments" aka Varignon's Theorem, find the moment with that same force applied at...
  27. I

    Finding the Tensions using the sum of moments

    Homework Statement The tower is 70 m tall. If the tension in cable BC is 2 kN, and you want to adjust the tensions in cable BD and BE so that the couple exerted on the tower by the fixed support at A is zero. A) Determine the tensions in cable BD and BE by applying the sum of the...
  28. L

    Solving Lever (Moment) Homework Problem

    Homework Statement A uniform 10 m long, 50 kg pole is lying on the ground. You get your little brother to lift at one end with an upward force of 100 N. How far from the other end will you need to lift so the pole stays horizontal (in m)? [Hint: Using your little brother as the fulcrum, what...
  29. W

    Moments and which direction they act

    if i have a fixed x and y-axis and i have a few forcesin both negative and positive directions when i calculate the sum of the moments how am I meant to know which direction they act M=Fd
  30. W

    Moments using force and distance.

    Homework Statement The 4-kN force F is applied at point A. Compute the moment of F about point 0, expressing it both as a scalar and as a vector quantity. Determine the coordinates of the points on the x- and y-axes about which the moment of F is zero Homework Equations m=fd The...
  31. P

    Dipole Moments - Understanding Magnitude and Direction | Homework Clarification

    Homework Statement Hi there, I am kind of new to this site, so please bear with me. On the more advanced physics forum page, there was a question about dipole moments, and the way the help had been described was a bit over my head. I am posting this for clarification purposes because this is...
  32. T

    Bending Moment Diagram for Trapezoidal Distributed Load: Homework Help

    Homework Statement I have a problem which involves me drawing the bending moment diagram for a trapezoidal distributed load. I understand the bending moment diagrams for a uniform distribution, and partially for a triangular distribution, however i am struggling to link the two for a...
  33. B

    What is the distribution of forces on a swimming pool springboard?

    Homework Statement The diagram (not included) shows a straight, horizontal swimming bath spring board of length 4m and weight 300N. It is freely hinged at A and rests on a roller at B where AB=1.6m. A boy of weight 400N standard at end C. a) show directions of forces acting on A and B b)...
  34. H

    Shear forces and bending moments on a box barge, formulas

    Homework Statement I need to determine loading sequences for a box barge - I have lots of information on the actual question, which I can't put up here because I have not attempted this question. I am really after some advice as to where I can find the equations I need. My (merchant navy)...
  35. R

    How Do You Approach Biomechanics Torques and Moments Problems?

    QUESTION 1 WORK TO SOLVE QUESTION 1/SECTION1 - CONFIDENCE 80%
  36. P

    M2: moments when forces are not perpendicular

    Homework Statement A smooth uniform rod AB, of length 3a and weight 2w, is pivoted at A so that it can rotate in a vertical plane. A light ring is free to slide along the rod. A light inextensible string is attached to the ring and passes over a fixed smooth peg at a point C, a height 4a...
  37. X

    Proving what the reaction force equals with moments in mechanics.

    Homework Statement A horizontal piece of wood that has a weight 40N is held in equilibrium by two brackets, A and B. The wood is 1.6m long (CD). A is 0.4m from C and B is 0.2m from D. Meaning that there is 1.0m between A and B. At rest the reaction force at A is 24 N and at B 16N. When an...
  38. X

    Mechanics question involving moments

    Homework Statement A plank of wood is lifted off the ground so it has one side on the ground (A) and the rest of the wood at a slope at 15degrees to the horizontal. The length of the wood (AC) is 2.5m. A force is applied at C at 65degrees to the horizontal to the left keeping it in...
  39. L

    How Do You Calculate the Total Moments for Various Points on a Beam?

    1. Calculate the total moment of the forces on the thin beam shown in the attached file, about each of the points A, B, C, D, E. Each of the distances AB, BC, CD, DE is 1m. 2.Clockwise moments = Anit-clockwise moments 3.(Axd)+(Exd)+[50sin(45)]=(20xd)+25 20+20+42.5=20+25 82.5=45...
  40. L

    Clockwise moments = anti-clockwise moments

    1. The rod shown in the diagram(mass 10g, length 100cm) is in equilibrium. Find the position of the pivot and the magnitude of the supporting force F. 2.clockwise moments = anti-clockwise moments 3. I'm not so sure here. I have unknown distances. Please see file attachment 2 -...
  41. S

    Inertia Tensors for Fractional Volumes: How to Calculate?

    Homework Statement How do you find the tensor of inertia for fractions of the usual volumes? (like half of a sphere, half of a cylinder, half of a disk, quarter of a disk, etc.) I already know the tensor of inertia for the whole volume. Take M as the fraction of the volume's mass, not the...
  42. G

    Calculating Moments about a point with couples.

    Is there someone who can provide me with a link that clearly states the best way to tackle these problems? Your help would be greatly appreciated.
  43. P

    Calculate Max Angular Velocity of Spring: Moment of Inertia Homework

    Homework Statement I linear spring has one end attached to a ceiling, the other end hanging freely. It was noted that the spring was extended by 120mm when a mass of 2.5kg was attached at the bottom. If the moment of inertia of the mass is 10kg.m2 about its vertical axis, calculate the...
  44. D

    How Does Material Heterogeneity Affect Beam Stress Analysis?

    for the folowing beam made up of a top half where E=210Gpa and a bottom part where E=70Gpa a=0.2m t=0.024m, b=0.04m i am asked a few different things a)to find the shear forces and bending moment arrays in the beam b)plot the normal stress as a function of the moment, how do...
  45. Pengwuino

    Moment of Inertia, relation to other moments?

    Is there a reason the moment of inertia is called the "moment" of inertia? A while back, for whatever reason, I remembered how the moment of inertia is formulated and I realized it had similarities to the e/m moments; that is the integration of the mass density multiplied by coordinates. In...
  46. U

    Understand Physics Moment: Get Answer to Concept, Formula & More

    I am trying to understand how the concept of moment was introduced in physics. For example I don't understand how the formula of the moment of impulse was created. Specifically I don't understand why the multiplication with R (L=PXR, or torque=FXR). Is it demonstrated by experimentation, or the...
  47. D

    Understanding Magnetic Dipole Moments: A Beginner's Guide

    i want to learn about magnetic dipole moments but don't have a good grasp on it
  48. F

    HELP Helicopter Center of Moments

    Hi, I am creating an helicopter simulation and have a question about calculating the correct helicopter origin of moments. In its simplest terms, ignoring drag and tail rotor forces and torques I have the main rotor generating an upward thrust from the rotor hub, and gravity generating...
  49. R

    How Do I Solve This Moment Problem in My Assignment?

    Hello I'm new :) I'm stuck on my assignment on moments. Homework Statement Now i have attached a copy of my assignment paper which I scanned. Here is the link Now the horizontal and verticle forces sum is correct. But when I try to do the sum of moments I get 50.831 Kn when the...
  50. S

    Principal moments of inertia ellipsoid

    Problem: Find the principal moments of inertia of an ellipsoid. I began to label moments of intertia about minor axises. But I'm not sure where to go after that.
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