What is Moments: Definition and 624 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. A

    Solving Torque and Moment Problems: Why Can't We Use Center of Mass as Pivot?

    Homework Statement Regarding part (c) (i), as we know that we can consider any of the convenient point as our pivot. If I consider the point where the 5kg mass (center of mass of the bag) acts, the asnwer turns out to be wrong. The correct answer has 4kg mass as pivot Homework Equations...
  2. B

    Bending Moments and max deflection

    Please could some help me get around this problem I know the derived formulas are all over the internet, but I wanted to prove it out myself. Its for a supported beam 2 end beam, worked out the max bending moment is M=PL/4. However I just can't seem to get the max deflection equation of...
  3. kostoglotov

    How Do X-Braces Affect Indeterminate Truss Analysis?

    Homework Statement For a larger project we had to redesign a truss to prevent certain members going beyond yield stress. I've found that due to the nature of the reaction forces and the supports used, the only way to do this is to introduce an X-brace in the bay nearest the supports (as well...
  4. radaway

    Moments and Force: Calculating Distance and Mass of a Caravan

    Homework Statement 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...
  5. radaway

    Moments and force -- Forces on a cantilever hole punch

    Homework Statement 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. Homework Equations http://s6.postimg.org/yx62wbild/image.png The Attempt at a Solution would it...
  6. Vanessa Avila

    Statics: Finding the moment on point B?

    Homework Statement [/B] Determine the moment about point B of each of the three forces acting on the beam. Homework Equations M = F*d⊥ The Attempt at a Solution I went and found the components for each of the forces. Please double check it if I did them right: F1 : Fx = 0 Fy = 375 lb F2: Fx...
  7. K

    Bending moments at equillibrium

    "Consider a prismatic member AB possessing a plane of symmetry and subjected to equal and opposite couples M and M0 acting in that plane . We observe that if a section is passed through the member AB at some arbitrary point C, the conditions of equilibrium of the portion AC of the member require...
  8. I

    A 1st and 2nd moments of H(mu) function

    I have this question from radiative transfer for my assignment. Relation between 1st and 2nd moments of H(mu) function in radiative transfer.
  9. A

    Static Equilibrium Problem involving Moments

    Equations: Net torque=0=Net force I believe this is a static equilibrium question but can't figure out how to do it
  10. N

    Simple truss question I can't seem to get right

    Homework Statement ignore all the other writing! The Attempt at a Solution I can't tell where I'm making a mistake. Probably a massive oversight somewhere but I don't know where! First find the reaction forces at the pin and roller by treating everything as a rigid body. (I am now aware...
  11. H

    External forces and external moments

    Homework Statement While reading course lecture at ocw.mit i have stumpled upon such an equation $$\dot H_O = \sum_{i=1}^n (\dot r_i \times m_i v_i) + \sum_{i=1}^n (r_i \times m_i \dot v_i) = 0 + \sum_{i=1}^n (r_i \times (F_i + \sum_{j=1, j\ne i}f_{ij} )) = \sum_{i=1}^n (r_i \times Fi) +...
  12. N

    Moments Question Homework: Varignon's Theorem & Finding Axis

    Homework Statement Homework Equations tau = r x F varignons theorem The Attempt at a Solution I drew the diagram and the moment arm method and the component of the force perpendicular to vector OA seemed hard to find, so I used varignons theorem. tau = -abs(5000*5)+abs(6000*-4) = -16000...
  13. D

    A Qualitative meaning of central moments higher than 4th order

    The qualitative meaning of central moments up to 4th order (mean, variance, skewness, and kurtosis) is well documented and explained in literature. I am posting this question because I am interested to know if any of the higher moments (5th, 6th, and so on) has some clear qualitative meaning as...
  14. H

    Moments and shear force diagram

    Hi Can someone please help me with this problem: A beam is 16m long and rests on two supports, 10m part. the right support is 4m from the right-hand end. The beam carries a uniformly distributed load of 408 kg/m between the two supports and concentrated loads of 2kN at the left end, 0,153 tons...
  15. J

    I Does mass density affect load distribution on barbell?

    Had an argument with a few guys at the gym today. I told them that loading a barbell with 100 on each side instead of 2 45s and a 10 causes more pressure on your spine. This example is in reference to someone performing a low bar squat in which the bar has contact points across the entire back...
  16. D

    M=Fl solve a Moments problem (force X distance)

    1. The problem statement, all variables and given http://imgur.com/kxALo8w with how much force is the wire pinched? Homework Equations M=Fl The Attempt at a Solution [/B] I don't know how I am supposed to do this. This is my attempt: 0,15 * 20 = 3Nm and now what?
  17. A

    Equilibrium and principle of moments

    Homework Statement Homework Equations Torque = F x D Manticlockwise = Mclockwise The Attempt at a Solution From what I understand, the moment on left hand side of the pivot point needs to be equal to the moment on right hand side, therefore... (Fx.2)+(5x.14) = (7xd) My initial...
  18. J

    What is the third force acting on a plank attached to a wall by a hinge?

    Homework Statement A plank of wood is attached onto the wall by a hinge. The blank is inclined at an angle of 30 degrees to the horizontal and is held stationary by a rope which is attached at the opposite end onto the wall. Label the three forces acting on the plank Homework Equations None...
  19. E

    What is the Significance of a Magnetic Dipole Moment?

    Is the magnetic dipole moment, the torque a material experiences when its placed in an external magnetic field? I know that the magnetic dipole moment for a current carrying wire is U=IA. The dipole moment is in the same direction of the Area, does this mean that the force it experiences will be...
  20. A

    When do reactive moments appear?

    Hello: I have some questions regarding what books say about reactive moments when dealing with journal bearings and such. For example:[PLAIN]http:// [url=http://postimage.org/] What I'm looking for is an explanation as to why the moments can be set to zero. We never do that in 2 dimensions! I...
  21. ReidMerrill

    Magnetic Moments of Coordination Complexes

    Homework Statement Predict the magnetic moments (spin-only) of the following species: a. [Cr(H2)6)2+ b. [Cr(CN)6]4- c. [FeCl4]- d. [Fe(CN)6]3- e. [Ni(H2O)6]2+ f. [Cu(en)2(H2O2)]2+ Homework Equations ? The Attempt at a Solution I figured that Cr is 2+ for part A and B but I don't really know...
  22. B

    A Isovector and Isoscalar magnetic moments

    Hi all, I am currently working on the Skyrme model. In the paper of Zahed and Brown: "The Skyrme Model" which can be found online they want to calculate the magnetic momenta of protons and neutrons. They do this by first calculating the isoscalar and isovector magnetic moments(p.69). However, I...
  23. tarchuletta

    How to use Moments of Inertia to find Max Acceleration (sportbike pre-wheelie)

    So in this problem there's a lot of leeway as far as parameters go. The numbers I give for weights, dimensions, etc, may not be super realistic, but that's not too important to me because I can plug in realistic numbers later. I more of need help understanding the concept of moments of inertia...
  24. E

    Superposition of Moments of Inertia about Different CGs

    Hi all, You can use superposition to add moments of inertia when they're calculated about the same center of gravity (cg), but let's say you calculate the moments of inertia of several elements of a system about one cg and then use the Parallel Axis Theorem to then reference the total moments...
  25. Rumplestiltskin

    Balancing Moments: A Ruler's Center of Mass

    Homework Statement A metre stick has its centre of mass at the 50cm mark, and weighs 0.92N . A 2.00N weight is stuck to the 10cm mark with massless glue. About which point will the ruler balance? Homework Equations Σclockwise = Σanticlockwise The Attempt at a Solution 2 N * 0.4 m = 0.8 Nm...
  26. Rumplestiltskin

    Moments question -- Two workers moving a scaffolding

    Homework Statement Two workers are moving a 20kg , 10m scaffolding pole. One stands at the end, the other stands 2.0m from the other end. Calculate the force exerted by the worker standing at the end in holding the pole. Assume the mass is distributed evenly and g = 9.8 m/s2. Homework...
  27. Priyadarshini

    What is the torque needed to lift a weight with a lever?

    Homework Statement Homework Equations Torque=one of the forces x the perpendicular distance moment=force x perpendicular distance The Attempt at a Solution moment of pulling the weight up around the disc: 1.2/2 = 0.6 m 0.6-0.2 = 0.4 m moment= 0.4 x 900 = 360 Nm To lift it, the torque of the...
  28. A

    What is moments in rotational mechanics?

    i have often come across the sentence "by taking moments" in rotational mechanics, but i really don't understand ,what it is.please explain it(iam not referring to moment of inertia).
  29. Rumplestiltskin

    Moment of a Force: How to Find an Unknown Force on a Pivoted Metre Stick

    Homework Statement A metre stick is pivoted at 50cm and is in equilibrium. There is a 2.0N upwards force at the 5.0cm mark, and a 12N downwards force at the 40cm mark. Force F acts at the 75cm mark. Find force F. Assume the upwards direction is positive. Homework Equations The Attempt at a...
  30. 1

    Did I draw the moments correct in a shelter? (engineering)

    Homework Statement I had to analyze a shelter with a vertical load and 2 horizontal loads, the picture I added is for a vertical load (eg snowload: action) I needed to draw the moments that are mainly there..(black arrows M1-M8) are they correct? and it's fixed Homework EquationsThe Attempt at...
  31. W

    Easy Free Body Diagram Question

    Homework Statement Draw the free body diagram of the system. (I know that's not what the problem is, but that's what I need clarity on) Homework EquationsThe Attempt at a Solution So I drew the same thing, more or less, but for mine Ay went up. This was how a very similar problem was done -...
  32. B

    Understanding Moments of Inertia: A Guide for Solving Homework Problems

    Homework Statement Attached in a picture! Homework Equations I = mr^2 m = (x*y) cm = (x/2, y/2) The Attempt at a Solution I was able to solve Part 1 fairly fast, but Part II has drawn a blank for me overall. I was thinking of that rotational thing from Calculus where you spin a 2D figure...
  33. C

    Where can I start learning about moments of inertia?

    Homework Statement My question doesn't follow the guidelines for asking for homework help because I'm looking for sources where I can learn about moments of inertia, not help for a specific homework problem. I'm going to try to figure out the moment of inertia of a propeller, but I don't know...
  34. M

    Summing moments about a point (statics)

    Homework Statement Hi, I don't have a specific problem, I just need to know what to do when summing the moments about a point if there is a moment given at a different point. Do I just add it into the equilibrium equation as if it was about the point I am summing the moments about? Homework...
  35. W

    Solve Truss Joints Using Method of Joints

    Homework Statement Determine the axial forces in the members of the truss and indicate whether they are in tension or compression. Homework Equations Fx = 0 Fy = 0 Mp = 0 The Attempt at a Solution I attempted to find the reactions at the supports first. So: Fx = 0 = Bx + 800cos(250)N Fy...
  36. W

    How Do You Calculate the Reactions at Supports in a 3D Equilibrium Problem?

    Homework Statement The 1.1m bar is supported by a ball and socket support at A and 2 smooth walls. The tension in the vertical cable CD is 1kN. Draw the Free Body Diagram of the Bar. Determine the Reactions at A and B. Homework Equations Equillibrium equations. Perhaps the vector...
  37. A

    Calculating Perpendicular Line using Right Triangle: Engineering Guidance

    Hi, I need help with this question. Is it correct if I draw the line perpendicular to A and calculate it using a right angled triangle? Some guidance please ... the y height is 280mm and x is 400mm
  38. I

    Dissapating corner moments in a rectangular underground tank

    This is a conceptual question based on a project I and a few other engineers finished at work. We are replacing the roof of a concrete tank that is part of a larger pump station for a river. Unfortunately, the roof is very integral in this structure, which means that once it's removed, the walls...
  39. Gian Lukmana

    Statics :　Direction of Moments

    I still don't really get the concept of moments.. if moment is what makes things rotate, imagine this : ....... F (pushing down the stick) ===================(stick) A so : 1. the stick will rotate in a clockwise direction, 2. but the direction of the moment is negative Z.. (right hand rule)...
  40. W

    What is the angle between coupled forces with a given moment and magnitude?

    Homework Statement The moment of the couple is 600k (N-m). What is the angle A? F = 100N located at (5,0)m and pointed in the positive x and positive y direction -F = 100N located at (0,4)m and pointed in the negative x and negative y direction Homework Equations M = rxF M = DThe Attempt at a...
  41. CivilSigma

    Moments of Inertia by Integration

    Homework Statement I am having trouble understanding the formula for Moments Of Inertia by direct integration. Homework Equations I understand the following (which is the definition) : $$ I_x = \int y^2 dA $$ $$I_y = \int x^2 dA $$ However come to application on a problem, my book doesn't...
  42. R

    Finding the Distance of a Balanced Seesaw: A Question in Moments

    Homework Statement "A child and her father are playing on a seesaw. They are exactly balanced when the girl (mass 46 kg) sits at the end of the seesaw, 2.75m from the pivot. If her father weighs 824 N, how far is he from the pivot?" Homework Equations (sum of) clockwise moment(s) = (sum of)...
  43. Handsome jack

    How Can You Find Forces P, F, and T in a Static Equilibrium Problem?

    1. Homework Statement Find forces P,F,and THomework Equations Fx = 0 Fy = 0 The Attempt at a Solution So far I only got force T from getting the moment from point b. Don't know how-to start getting force P and F since they're both at the same point. Any help will be much obliged thank you [/B]
  44. Priyadarshini

    Moments of a Ladder Propped Up Against A Wall

    Homework Statement A uniform ladder rests against a vertical wall where there is negligible friction. The bottom of the ladder rests on rough ground where there is friction. The top of the ladder is at a height h above the ground and the foot of the ladder is at a distance 2a from the wall...
  45. Priyadarshini

    A Uniform Rod Is Attached To A Point With A String---Moments

    Homework Statement Use the principle of moments and take moments about A to show that the weight of the object O is 19 N.Homework Equations Moment=Force x perpendicular distance The Attempt at a Solution Vertical component of tension= TsinA...
  46. Priyadarshini

    Magnetic Moments of Atoms/Ions

    Hi! I recently learned about magnetic moments of atoms and their ions. I understand the formula and the calculations. However, what exactly IS a magnetic moment? What does the value in Bohr Magnetons give us? How does this value affect the properties of the atom/ion? Thanks in advance!
  47. D

    MHB Finding Method of Moments Estimates for Uniform Distribution Parameters

    The problem: Let the five numbers 2,3,5,9,10 come from the uniform distribution on [$\alpha$,$\beta$]. Find the method of moments estimates for $\alpha$ and $\beta$ . I am trying to wrap my head around the idea behind estimates of moments. From what I understand, the first moment is the mean...
  48. K

    Moments of inertia of a rectangular plate

    Homework Statement Show that the moment of inertia of a rectangular plate round it's diagonal, line B-B is equal to the one round a line parallel to one of the edges and passing through the center, line C-C Homework Equations Moment of inertia: ##I=mr^2## The Attempt at a Solution For the...
  49. jdawg

    Moments of Inertia for Composite Area

    Homework Statement Determine the moment of inertia of the cross sectional area of the T beam with respect to the x' axis passing through the centroid of the cross section.(I'm attaching a diagram) Homework EquationsThe Attempt at a Solution Hi! I'm having a little trouble with this problem...
  50. D

    Temporary dipole moments and energy conservation

    Do temporary dipole moments require energy to form? I'm talking about Van der walls and London forces. If temporary dipole moments don't require energy to form then consider the free electrons in a metal plate, temporary dipole forces in the metal act on the free electrons causing them to gain...
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