What is Rod: Definition and 1000 Discussions

Röd (Swedish for Red) is the eighth studio album by Swedish alternative rock band Kent. It was released as digital download exclusively through the band's website on 5 November 2009 and physically on 6 November 2009. The first single from the album, "Töntarna", was released as digital download on 5 October 2009.
Röd is available in a standard edition and a deluxe edition box. The deluxe edition box version features the 11-track CD, a USB flash drive with high quality MP3 files as well as AIFF files, three 10" records which between them contain the whole album, and a 118-page book containing lyrics, abstract pictures and photographs. Due to distribution difficulties the deluxe edition was delayed until 11 November 2009.

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  1. M

    Deformation of a dicomponent rod under tension

    For this problem, my thinking was that since the top of the rod is fixed, then the only part that is elongating is the bottom, so I found the part elongating at AB and said that was the total elongation. I am not sure if this reasoning is sound. I suppose the other possibility would be to add up...
  2. D

    MHB Solving Heat Flow in a Rod: Initial & Boundary Conditions

    The temperatures at ends \(x = 0\) and \(x = \ell\) of a rod length \(\ell\) with insulating sides held at temperatures \(T_1\) and \(T_2\) until steady-state conditions prevail. Then, at the instant \(t = 0\), the temperatures of the two ends are interchanged. Find the resultant temperature...
  3. N

    Radius of curvature of steel rod under stress

    Hi, I have a problem which you guys probably could help me solve or at least advise how to approach. I am building a mechanical system that consists of 2 steel rods acting as rails and a platform that travels along. I need to find radius of curvature of a steel rod under stress to see by...
  4. C

    Bead sliding on a rotating rod Lagrangian

    Homework Statement A bead of mass m slides under gravity on a smooth rod of length l which is inclined at a constant angle ##\alpha## to the downward vertical and made to rotate at angular velocity ##\omega## about a vertical axis. The displacement of the bead along the rod is r(t)...
  5. F

    Electric potential of a uniformly charged thin rod.

    1. Problem statement A thin rod of length 2L has charge Q uniformly distributed along its length. 1. Draw a graph of the charge density as a function of x from -L to L 2. Find the electric potential at point P a distance y away 3. Use the result in part 2 of the electric field at point...
  6. T

    Friction of a rope wound around a stationary rod

    Homework Statement A 100 kg man holds up a 1000 kg weight by holding on to a rope that is wrapped around a stationary horizontal rod whose other end is tied to the suspended weight. If the coefficient of static friction between the rope and rod is 0.5, what is the minimum number of times that...
  7. M

    Oscillating rod attached to spring

    Homework Statement A thin uniform rod is pivoted about its mid-point, with the lower end attached to a spring. See the figure. At equilibrium the rod is vertical. Show that on a (small) displacement from equilibrium the rod will oscillate with simple harmonic motion at a frequency: f =...
  8. L

    Transfering power to a pulley attached to a rod

    A picture speaks a thousand words. In this video, at 41 seconds: [URL="http://www.youtube.com/watch?v=FBZWZfbxeJw"] Eugene R transfers power to a pulley attached to a rod but only the pulley spins. I am in the process of fabricating a pulley system like this. My question is: How is this done?
  9. PhizKid

    Electric field at a radius outside of a hollow cylinder w/ a rod in it

    Homework Statement Consider a hollow cylinder of radius 10 m., length 50 m., and charge 6 C., and a rod with radius 4 m., length 50 m., and charge -4 C. The rod is uniformly placed inside the center of the hollow cylinder. What is the electric field at radius = 15 m.?Homework Equations...
  10. burnst14

    Equilibrium of a Rod Problem: Find Minimum Distance x

    Problem Statement: As shown in the figure below, a uniform beam is supported by a cable at one end and the force of friction at the other end. The cable makes an angle of θ = 30°, the length of the beam is L = 1.50 m, the coefficient of static friction between the wall and the beam is μs =...
  11. K

    Rigid rod moving in potential field

    Hi, I'd like to write a program that "simulates" a rigid rod of length L moving in a potential field. The problem is in two dimensions. Friction is assumed to be negligible. The potential field and its gradient is known at every point of the two-dimensional domain. The "mass" of the rod...
  12. F

    Finding electric field of a bent uniform charged rod.

    1. Problem statement. 2. Known equations. E = k § dq/r^2 Lamda = Q/L 3. Attempt. I am having trouble figuring out the dq in this situation. I know that lamda = Q/L, and since those 2 are the variables that are changing I take the derivative of them so it looks like Lamda = dq/dL I...
  13. M

    What is the tension at point A below the x-z plane?

    So I am thinking about this problem, and what I don't understand is how at that point A, it is below the x-z plane, but it is not given how far below it is. If I knew, I could solve for the tension in the y-direction and set it equal to the weight. I must be able to use c and 8 in. to get me...
  14. N

    Finding the magnitude of the electrostatic force from a thin rod

    Homework Statement The figure shows a uniformly charged thin rod of length L that has total charge Q. Find an expression for the magnitude of the electrostatic force acting on an electron positioned on the axis of the rod at a distance d from the midpoint of the rod...
  15. C

    Elastic energy of a bent steel rod

    Homework Statement [Math. for Physicists, M. Stone Problem 1.4] Assume that a rod of length L is only slightly bent into the yz plane and lies close to the z axis, show that the elastic energy can be approximated as U[y]= \int_{0}^{L} \frac{1}{2}YI(y'')^2 dz Homework Equations It is...
  16. M

    What is the fundamental frequency of an aluminum rod?

    Homework Statement A longitudinal standing wave can be created in a long, thin aluminum rod by stroking the rod with very dry fingers. This is often done as a physics demonstration, creating a high-pitched, very annoying whine. From a wave perspective, the standing wave is equivalent to a...
  17. B

    How Does Moving an Iron Rod Affect Ammeter Readings in a Solenoid Circuit?

    Homework Statement A solenoid with a large number of turns of wire is connected in series with an ammeter and a battery. An iron rod is moved towards the solenoid at constant speed. What will happen to the reading on the ammeter (A) as the rod moves closer to the solenoid, before...
  18. T

    Elastic collision between rod and ball

    Homework Statement A rod of mass M is lying on a flat frictionless surface. A small ball of mass m and velocity v collides with the rod in the center at the rod at right angle to the rod. The collision is elastic. Homework Equations a) Where is the axis of rotation for the rod...
  19. Saitama

    Particle sliding on a thin rod

    Homework Statement A particle of mass m is free to slide on a thin rod. The rod rotates in a plane about one end at constant angular velocity ##\omega##. Show that the motion is given by ##r=Ae^{-\gamma t}+Be^{+\gamma t}##, where ##\gamma## is a constant which you must find and A and B are...
  20. R

    Why aren't the wheels on my car/bike connected?

    In this problem, the left wheel is connected via a slot and consequently I don't see how the wheel would undergo any motion at all until such time that the rod moves all the way to the edge of the slot because before this time, the joint can just undergo rotational motion to compensate for the...
  21. N

    Uniform rod pivoted off-center

    √ωHomework Statement A uniform rod of mass 1.2 kg and length 1.2 m is pivoted in the horizontal position as shown (black point). The rod is at rest and then released. The acceleration due to gravity is g = 9.8 m/s2. Part 1. Find the rotational inertia of the rod relative to the axis...
  22. siddharth23

    Tension in different parts of a rod pivoted at1 end & rotating in HP

    I read that if a bar is pivoted at one end and is rotating in a horizontal plane, the tension at a specific point decreases as you go away from the pivoted end. Only inference I could draw from this is that the centrifugal force, which is the cause of tension, increses as you go towards the...
  23. J

    Time period of a pendulum consisting of a rod and bob

    Homework Statement How should I find the time period of a pendulum which is made up of a rod of length l fitted with a bob of radius r at its one end and the other end being pivoted to the wall? 2. The attempt at a solution Actually having problem with calculating...
  24. A

    Determining β in the L-Shaped Rod Problem

    Homework Statement The position of the L-shaped rod shown is controlled by a cable attached at point B. Determine the angle, β, in terms of θ.The Attempt at a Solution From the FBD attached, I was able to get: β = tan-1(\frac{0.24sinθ - EF}{0.24cosθ+0.32}) How can I determine what EF is...
  25. K

    Finding Ratios of Velocities After Impulsive Force on Rod of 3 Equal Masses

    Homework Statement Three equal masses are attached to the ends and midpoint of a light uniform rod, which lies on a smooth horizontal plane. One of the end masses is struck by an impulsive force perpendicular to the direction of the rod. Find the ratios of velocities of the three masses...
  26. R

    What will be the cross section area of rod?

    If a metal rod of 20 cm is charged with 10 μC, then what should be its cross section area so as to prevent electric discharge (electric breakdown) ?
  27. R

    Particle collides totally inelastically with a vertical free rod

    Homework Statement A particle of mass M moving on a frictionless surface with velocity ##V_0## collides totally inelastically with an uniform vertical rod of mass M and length L. After immediately the collision, what is the center-of-mass velocity, the moment of inertia about the...
  28. AJKing

    Young's Modulus: Vibrations in a rod

    Homework Statement From A.P. French, question 3-10. I'm having trouble decoding part b. /Do not solve/ please help me find what it is asking. ------- A metal rod, 0.5m long, has a rectangular cross section of 2mm2. (a) This question provided me with information to calculate young's modulus...
  29. B

    Negative Rod and Negative Conductors

    Hello, I am trying to understand induction. If I have a negatively charged rod, and two negatively charged conductors, does no induction occur? or is the induction simply the movement of the electrons from the more negatively charged conductor to the less negatively charged conductor? or does...
  30. C

    B field inside solenoid as a result of iron rod

    Homework Statement Consider a solenoid with a time varying current and with a coil of wire placed around it. Suppose there is a soft iron rod inside the solenoid. My question is: What happens to the (induced) current in the coil of wire as a result? Homework Equations Faraday, magnetic...
  31. N

    Point mass strikes thin rod: angular momentum

    Homework Statement A point mass "m" moving at speed "v" strikes the end of a stationary uniform thin rod of length "l" and the same mass "m" at a right angle. The point mass does not stick to the rod; the collision is elastic. There are no pivot or anchor points. The system is floating freely...
  32. V

    A thin vertical rod sliding until it hits a lump of putty and rotates.

    Homework Statement A thin vertical rod of mass m and length d slides on a frictionless horizontal surface with velocity Vo to the right. It his and sticks to a small lump of putty and rotates about the putty at point O. (a) Find the angular momentum of the rod about O just before and just...
  33. J

    Center of mass of a slender rod with variable density

    Hi to everybody Homework Statement I´ll show the problem with a picture: Homework Equations L\overline{x}=∫xc ρ dl The Attempt at a Solution Well the total length of the rod is 1 feet, I only need to calculate the integral. The moment xc of a differential element of mass of the rod is...
  34. P

    Torque with sign attached to a rod

    Homework Statement a 54.8 kg uniform square sign, 2.00 m on a side, is hung from a 3.00 m rod of negligible mass. A cable is attached to the end of the rod and to a point on the wall 4.00 m above the point where the rod is fixed to the wall. Homework Equations The Attempt at a...
  35. A

    How to determine moment axis and direction on a rod in 3d

    if i have rod of a certain length. let point (a) on one end of the rod and point (b) on the other end. along the rod axially is the X axis, vertically Y axis and Z is the lateral direction.let force prependicular on x -axis at point (b) and move this force to point (a) which will create a...
  36. R

    Calculate force acting on a Rod with constant mass and varying length

    Hi all, This is my first post on this forum. Please state out anything that I have done that does not coincide with the forums rules. Homework Statement I have to derive the force acting upon a uncooked spaghetti piece which is being pulled upon by a mass attached to its center for an...
  37. F

    Calculating Resultant Force at a Pivoted Rod | Uniform Rod in Vertical Plane

    Homework Statement A uniform rod of length 1.6 m and mass 20 kg is free to rotate about a frictionless pivot at one end in a vertical plane. The rod is released from rest in the horizontal position. The acceleration of gravity is 9.80 m/s2. Homework Equations What is the resultant...
  38. B

    Heat Equation with cylindrical rod

    Hello, I am looking to apply to heat equation to a cylindrical rod and solving with explicit finite difference scheme. I have never worked with cylindrical coordinates before, what would be the best way to model this? I am having a hard time understanding the advantage of using cylindrical...
  39. M

    Archived Find the angular acceleration and velocity at the end of a rod.

    Homework Statement A uniform, straight rod with mass M and length L can rotate about a horizontal axis A in a distance L/4 from the rods end. Vi can disregard friction. Gravity is 9.81 m/s^2. (drawing included at the bottom) 1) Find an expression for the moment of inertia of the rod at point...
  40. D

    Effective potential of a particle sliding on an inclined rod

    Homework Statement Hey guys, Here is the question: A pointlike mass m can slide along a rigid rod of length l and negligible mass. One extremity of the rod is fixed at the origin O of an inertial system (x,y,z), and the rod forms a constant angle α with the z-axis. The rod rotates...
  41. J

    Balance of a metal rod problem.

    1. Homework Statement I am trying to determine the limitations to my experiment and thus how to improve them. The experiment's objective is to determine the mass of a metal rod. The rod is balanced every time another 1kg is added onto the end of the rod. This means that the rod cannot...
  42. J

    Help with Balancing a metal rod experiment.

    Help with "Balancing a metal rod" experiment. 1. Homework Statement I am trying to determine the limitations to my experiment and thus how to improve them. The experiment's objective is to determine the mass of a metal rod. The rod is balanced every time another 1kg is added onto the end...
  43. T

    Angular Oscillation of a rod in a circle

    Homework Statement A uniform rod moves in a vertical circle .Its ends are constrained to move on the track without friction.Find the angular frequency of small oscillation .Homework Equations The Attempt at a Solution Suppose the rod of length L moves in a circle of radius R . Let the...
  44. C

    A rod is 6 m long pivoted at a point 1.5 m from the left end. Two dow

    Homework Statement A rod is 6 m long pivoted at a point 1.5 m from the left end. Two downward forces of magnitude 50 N and 200 N are exerted on the left and right end of the rod respectively. At what distance from the pivot point must a third upward force of magnitude 300 N be exerted...
  45. U

    Emf induced by swinging rod in magnetic field (I got 2 answers?)

    Homework Statement Homework Equations The Attempt at a Solution Their answer assumes that the B-field is perpendicular to the velocity at all times, which is clearly not the case. And in the next part of the question, won't the answer be zero? since now velocity is parallel to B-field? (So...
  46. J

    Moment of Inertia of a Rod with Two Uniform Masses Attached

    Homework Statement A uniform thin rod with mass 4.59 kilograms pivots about an axis through its center and perpendicular to its length. Two small bodies with a mass of 0.543 kilograms, are attached to the ends of the rod. What is the length of the rod such that the moment of inertia of the...
  47. T

    A bullet hits a rod; find the angular velocity

    Homework Statement A uniform rod of length L rests on a frictionless horizontal surface. The rod pivots about a fixed frictionless axis at one end. The rod is initially at rest. A bullet traveling parallel to the horizontal surface and perpendicular to the rod with speed v strikes the rod at...
  48. T

    Bug Jumps off a rod; what is the angular velocity of the rod

    Homework Statement A small 13.0g bug stands at one end of a thin uniform bar that is initially at rest on a smooth horizontal table. The other end of the bar pivots about a nail driven into the table and can rotate freely, without friction. The bar has mass 65.0g and is 120cm in length. The...
  49. S

    Torque and Equilibrium of a Rod

    Homework Statement Here's a diagram of a rod that's free to pivot about the point indicated. Is it possible to make the right end of the rod push down, by pulling on the left end of the rod? If so, show on the diagram the direction that you would pull on the left end of the rod, and explain...
  50. D

    Moment of inertia for a thin rod

    Homework Statement The thin rod shown has a length L = 100 cm, and a density that varies from 26 g/cm at the origin to 3 g/cm at the far end. Determine a) the moment of inertia about axis 1 (passing through the center of mass of the rod), and b) the moment of inertia about axis 2 (passing...
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