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. P

    Different young modulus of rod - Need a proper explanation?

    Homework Statement A rod is made up as shown [pic attached] Both have same cross-sectional area. Ep and En are Young modulus. The rod breaks when total extension = 3.0mm Greatest tensile stress that can be applied before rod breaks? Homework Equations Young modulus = stress / strain The...
  2. powerof

    Analyzing Forces and Torque of a Slipping Rod

    Homework Statement [/B] As a diagram any of the countless images on the internet serve well: Suppose the static friction was not sufficient to maintain the rod in a static equilibrium and it starts slipping/sliding. It has an initial angle theta with respect to the ground. Assume there is no...
  3. Q

    Moment of Inertia of a rod and two spheres

    Homework Statement A barbell that consist of a long thin rod of mass M and length L is attached to two uniform spheres on each end. Both spheres have mass M and (1/3)L. The sphere on the left is hallow (spherical shell) and the sphere on the right is solid. What is the moment of inertia for...
  4. H

    What is the error in the solution for Example 25.3.1(a) on page 11?

    Homework Statement The problem is Example 25.3.1 (a) on page 11 here: http://ocw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/angular-momentum-1/conservation-of-angular-momentum/MIT8_01SC_coursenotes25.pdf. Homework Equations 3. The Attempt at a Solution [/B] Here is...
  5. marcophys

    Behaviour of light thru a glass rod 'end to end'

    Pre-amble A glass rod with polished faces. Light goes in one end, and exits by the other end. We hear of light bouncing down fibre optics. What then happens with a glass tube, that has a rough ground inner and outer surface? Or worse... when a part of the inner diameter is 'hot melt enlarged'...
  6. L

    The moment of inertia of a rod that is rotating off the end of the rod.

    Is there a formula for the moment of inertia? A thin, uniform density rod is rotating about an axis that is off the end of the rod, so it looks a bit like this: ------- | (------- is the rod and | is the axis of rotation, so the rod is rotating out of the plane of your screen) I just have...
  7. S

    Bead sliding on a rotating rod

    Bead is at rest on a thin rod pivoted at one end. Bead is about a cm from the pivoted end of the rod. Rod now starts rotating with an uniform angular velocity w rad/sec. 1.What curve does the bead trace from the point of view of an inertial observer? Here what i think... solution of the...
  8. Davephaelon

    Niobium-titanium rod radioactive?

    I just purchased a niobium-titanium rod, that I assume was once used in an accelerator experiment. Is there any danger that it might have a hazardous degree of radioactivity, from exposure to synchrotron radiation, assuming it was on the outside curve of a particle accelerator...
  9. B3NR4Y

    Relative Speed of Two Masses Connected by a Rod

    Homework Statement The system shown in consists of two balls A and B connected by a thin rod of negligible mass. Ball A has three times the inertia of ball B and the distance between the two balls is ℓ. The system has a translational velocity of v in the x direction and is spinning...
  10. Satvik Pandey

    Find Velocity of Rod Center of Mass When Making 30° Angle with Horizontal

    Homework Statement A thin rigid rod of length ##l## is placed perfectly vertical on a smooth ground. A slight disturbance on the upper end of rod causes lower end of rod to slip along the ground and rod starts falling down. Find velocity of center of mass of rod when the rod makes ##30## with...
  11. K

    What happens to a rod when an impulse is applied and it's floating in space?

    1. a uniform rod of mass m and length l is placed horizontally on a smooth horizontal surface.An impulse is applied at one end perpendicular to the length of the rod. what is the velocity of centre of mass and angular velocity of rod just after the impulse is applied.
  12. Satvik Pandey

    Time of Fall for a Pencil Dropped at an Angle

    Homework Statement Estimate the time it takes a pencil of length L=10 cm to hit the ground if initially the pencil makes an angle of 0.001 rad with the vertical. Take the gravitational acceleration to be 10m/s2 Details and assumptions Assume that the pencil is just a thin solid rod with...
  13. N

    Gravitational Field of a Uniform Rod

    Homework Statement A thin uniform rod of mass M and length L is centered at the origin and lies along the x axis. Find the gravitational field due to the rod at all points on the x-axis in the region Picture adjunct Homework Equations My two question are: Why r is'not the difference between...
  14. M

    Why does a moving rod within a circuit generate an opposing current?

    So when you have a regular circuit with a voltage source on one end and a conductive rod that is free to move laterally on the other and you turn on the current, the rod will move either left or right depending on the current direction. What is causing this movement? Lenz's Law? So is the rod...
  15. M

    Electric field along a finite rod

    Homework Statement Homework Equations V = q/(4*pi*E_0*r), when 0 is taken at infinity dV = -E*dsThe Attempt at a Solution a. The total charge of the rod is given by Q = lambda*L So the potential at P is given by V = (lambda*L)/(4*pi*E_0*y) b. We can calculate the electric field by...
  16. W

    Electrostatic interaction energy between a charge rod and ring.

    Homework Statement Thin rod of the length l is placed with one of its ends placed at the center Oof the thin ring of radius R as shown, perpendicular to the plane of the ring. Rod is charged with total charge Q that is distributed along the rod’s length with the linear charge density...
  17. M

    What is the angular velocity that the rod will rotate

    Hello! I'm pretty much translating this question word by word, so if you have problem understanding something off of it, please, let me know and I'll try explaining it better. Homework Statement Two masses of similar mass M are connected by a rod of length 2a. the rod is rotating on a...
  18. L

    Magnitude of electric field 32m from a rod

    Homework Statement "A rod 55cm long and 1.0cm in radius carries a 4.4μC charge distributed uniformly over its length. What is the approximate magnitude of the electric field 4.0mm from the rod surface, not near either end? What is the approximate magnitude of the electric field 32m from the...
  19. M

    What is the formula for calculating steel rod bending in a mouse trap?

    Sorry this isn't really intro to physics, it's high school physics... I'm investigating the force vs angle of a mouse trap and I need to talk about the uncertainties one thing is that the lever (hammer/arm/part that hits the mouse) bends. So the angle isn't very accurate. What formula do I...
  20. 9

    Modelling a joint in a threaded rod, joint, nut and washer assembly

    I am trying to use computer modelling to see stress. I want to compare it to my hand calculation, which uses the frusta cone method to find the stiffness of the joint. This way, I can check my calculation in a conceptual way. The model includes a nylon insert nut, a threaded rod, a washer and a...
  21. J

    How Do You Calculate Electric Field Components of a Uniformly Charged Rod?

    1. Problem Statement A uniformly charged rod of length L and total charge Q lies along the x-axis as shown in in the figure below. (Use the following as necessary: Q, L, d, and ke.) (a) Find the components of the electric field at the point P on the y-axis a distance d from the origin...
  22. Chacabucogod

    Stress of a Rod with angular velocity

    As far as I understand a rod that has an angular velocity is static. Nonetheless, if we analyze a particle in the rod, this particle will be subject to a centripetal force that will be proportional both to the angular force and radius. Now I understand that the external forces and momenta...
  23. R

    How does a lightning rod work?

    Greetings community An engineer came to me seeking help today. He asked me to determining the height of a lightning rod If the radius of the protection zone was given. Assuming the roof of the building is completely flat, what would the height (h = ?) have to be for a given radius of 75...
  24. E

    Electrostatic induction - rod and sphere

    Homework Statement Hi all, need a little help on an electrostatic induction problem. A positively charged metal rod is brought near to a neutral metal sphere. What is the charge of the metal sphere and the rod when the positively charged rod touches the neutral sphere. Homework Equations...
  25. T

    Finding the Speed of a Wedge and Rod System

    Homework Statement A thin rod of mass m = 1 kg and length l=1m is placed along the hypotenuse side of a wedge lying on a frictionless floor having mass M =5kg and angle 60° . At t= 0 the system is released from rest. Both the objects are free to move .Find the speed of the wedge when the rod...
  26. K

    Formula for pull force of a ring magnet on a metal rod

    Hi, Can somebody give me the formula for pull force of ring magnet(permanent. not solenoid or electric) on a metal rod. Also is the formula for pull force by a solenoid given below correct. If not let me know the correct one for the below. Force = ((N x I)^2 x μ x A) / (2 x g^2) N =...
  27. Rugile

    Rotating rod - potential difference between the ends

    Homework Statement A rod of length L and made of conducting material is attached with a smaller non-conducting rod of length l to an axle, which is rotating at constant angular velocity ω (see attachment). Find the potential difference between the ends of the rod. Of what strength magnetic...
  28. blintaro

    Rotation of a rod about a fixed end

    Homework Statement A 1 m long rod, 200g, is hinged at one end and held out horizontally, then released. What is the speed if the tip of the rod as it hits the wall?Homework Equations Initial energy = final energy rotational energy = .5Iω^{2} gravitational potential energy = mgh kinetic energy...
  29. O

    Rotational motion magnitude question -- Rod mounted on a pivot

    I've attempted this problem several times and keep getting 14 rads as the answer but its not an available answer choice... any help would be greatly appreciated. The problem: A uniform rod (mass = 2.0 kg, length = 0.6 m) is free to rotate about a frictionless pivot at one end. The rod is...
  30. S

    Measuring Force on a Fishing Rod: Equation and Sample Problem

    I am looking into building my own fishing rod and am really lost on how to measure force exerted strictly on a pole as it bends. I think I'll have to use a strain gauge but I can't even find an equation to measure the force. Can anyone provide the equation, variables, and sample problem...
  31. M

    Torque in one end of a rod in free space

    Hello. I'm having trouble with determining the dynamics of a rod, when one of the ends has a torque applied to it. I've illustrated it in the figure below: There are no external forces except of the torque - so no gravity, drag etc. Also, the rod is assumed rigid. How will it behave...
  32. T

    Solving Spider on the Rod Problem Using Conservation of Angular Momentum

    Homework Statement Homework Equations The Attempt at a Solution Applying conservation of angular momentum w.r.t center O MvL/4 = (ML2/12+ML2/16)ω , where ω is the angular speed of (rod+spider) This gives ω = (12v/7L) The torque τ acting on the system when the spider is at distance 'r'...
  33. A

    Tie Rod Stress Analysis - Critical locations

    I'm faced with a problem where I need to cut the length of the rod body on a tie rod, however, I need to prove that this modification will not affect the entire structure seeing as how the critical points of stress on a tie rod exist at the clevis and end rod. How would I go about proving that...
  34. Z

    When Will the Rod Fall without Slipping?

    Homework Statement A uniform rod of mass M and length L is placed vertically on a flat surface. The coefficient of friction between the rod and the surface is μ. The rod is beginning to fall, initially without slipping. To describe the motion of the rod during this stage: (a) Write down the...
  35. V

    Energy conservation of a rod in free space

    Hey everyone, A meager pea brain (me) is in need of some help from you fine physics gentlemen. This is a concept I've spend a lot of time pondering on (more than I would like to admit). Imagine a rod of uniform density in free space. If you apply impulse onto the center of mass then it...
  36. Govind_Balaji

    Why is glass rod used in decanting?

    I always see in many books and articles. Glass rod is used for decantation. Why should we not pour the liquid just directly. I asked my chemistry teacher. She told me to experiment myself by decanting two identical heterogenous mixtures, one using a rod and other without one. Please tell me...
  37. Quarlep

    Gravitational Field Strength due to a Uniform Rod

    I am trying to learn Physics an dI am reading a booK about classical mechanics.I a stuck somewhere in there If you know a gravitational force to a uniform rod I saw there a x and dx Why we need them ? Thanks!
  38. A

    Uniform, semicircular rod of radius R and mass m in the center

    Homework Statement Pic: http://i.imgur.com/Ny4YAKf.jpg Rod has radius R, and mass M. Small mass has mass m. I have to find gravitational force exerted on mass m by rod and potential energy of the whole thing. Homework Equations The Attempt at a Solution So my idea is that...
  39. T

    Min Period of oscillation of a rod

    Homework Statement An iron rod of length L is hung at a common point with threads of length 'l' which are attached to the two ends of the rod. The rod is displaced a bit in the plane of the threads. What is the length of the threads if the period of the swinging of the rod is the least, and...
  40. J

    Solving for Angular Acceleration & Speed of Rod in Freefall

    Homework Statement Consider a uniform rod of mass 12kg and length 1.0m. At its end, the rod is attached to a fixed, friction-free pivot. Initially the rod is balanced vertically above the pivot and begins to fall (from rest) as shown in the diagram. Determine, a) the angular acceleration of...
  41. B

    Maximum tensile stress on rod with eccentric rotating tensile load

    I was solving this paper, but got stuck on this question, and it's been bugging me endlessly. I don't know what I'm missing. Here's the question: A rod of 20 dia is fixed to the ceiling of a roof on one end. A rotor of 50 kg mass is attached to the free end with bearings. The CG of the rotor...
  42. O

    MHB Scaled applied forces for an elastic rod

    am having difficulty in understanding this problem and frankly I don't know how to approach it, please assist on how to solve itThey say that an elastic rod is modeled as the half time[0,infinity). initially it is at rest. at the end point x=o, a force f(t) is applied then they give me the...
  43. D

    What is the net torque on a uniform rod rotating around a fixed pivot?

    The Attempt at a Solution Hello, I'm having trouble with energy in rotational motion. The question asks: Consider a uniform rod of mass 12 kg and length 1.0 m. At its end, the rod is attached to a fixed, friction-free pivot. Initially the rod is balanced vertically above the pivot and begins...
  44. U

    Thermal Diffusion Problem - Cylindrical Rod

    Homework Statement Part (a): Under what circumstances do these equations work? Part (b): Find Temperature as a function of x, in steady state. Part (c): Show heat loss is proportional to r^1.5 Part (d):Assume A = 0, show solution works, and find γ.Homework Equations The Attempt at a Solution...
  45. M

    Length change for a rod of two sections

    A rod is made of two sections joined end to end. The sections are identical, except that one is steel and the other is brass. While one end is held fixed, the other is pulled to result in a change in length of 1.20mm. By how much does the length of each section increase ? I understand that E...
  46. U

    Find the increase in the length of the rod

    Homework Statement A metal rod of length L at temperature of 0°C is not uniformly heated such that the temperature is given by the distance x along its length measured from one end when: T(x) = T_0 \sin (\pi x/L) Accordingly, points at x = 0 and x = L are also zero temperature, whereas at x...
  47. V

    Angular Acceleration of A rod with friction. Dynamics (General Plane)

    Homework Statement A 100 kg slender rod is lifted on the left end until the angle between the ground and the right end is 30 degrees. The right end is still in contact with the ground. The coefficient of friction between the rod and the ground is .5 and the length of the rod is 2.1 m...
  48. C

    Lagrangian of a falling rod

    Homework Statement A rigid rod of length ##\ell## and mass ##m## has its lower end in contact with a frictionless horizontal floor. Initially, the rod is at an angle ##\alpha_o## to the upward vertical when it is released from rest. The subsequent motion takes place in a vertical plane...
  49. G

    Conducting rod is free to move over a loop under influence of B field?

    Homework Statement The conducting rod ab shown in the figure (Figure 1) makes contact with metal rails ca and db. The apparatus is in a uniform magnetic field 0.800 T, perpendicular to the plane of the figure. If the resistance of the circuit abdc is 1.50 Ω (assumed to be constant), find...
  50. K

    Uniform rod resting against rough vertical wall supported by a string.

    Homework Statement Uniform rod AB with end B resting against rough vertical wall. Coefficient of friction between wall and rod is μ. Rod is 2m long and has mass 3kg. Rod is kept in limiting equilibrium by a light inextensible string, one end of which is attached to the end A of the rod and...
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