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. S

    Describing the circle of a uniform rod hit at one end

    I have a uniform rod laying on a table. A ball comes in and hits the rod making it move backwards but also rotating. Assuming that we are in a frictionless environment, how do describe the circle made by the rod?
  2. W

    Falling thin rod and angular speed

    Homework Statement A 1.80 m long thing rod is balanced vertically on its tip on the floor. It starts to fall and its lower end does not slip. What is its angular speed just before it hits the floor? Homework Equations 1/3ML^2 L=mvr The Attempt at a Solution When I first started...
  3. R

    Analyzing Falling Rod Motion: Angular Velocity and Tip Speed

    Homework Statement A long, thin rod of mass M and length L is standing straight up on a table. Its lower end rotates on a frictionless pivot. A very slight push causes the rod to fall over. As it hits the table, what are a)the angular velocity and b) the speed of the tip of the rod? I'm...
  4. A

    Calculating Coefficient of Linear Expansion for a Rod Using Temperature Change

    Homework Statement At 20° C, a rod is exactly 20.05 cm long on a steel ruler. Both the rod and the ruler are placed in an over at 250° C, where the rod now measure 20.11 cm on the same ruler. What is the coefficient of linear expansion for he material of which the rod is made? Homework...
  5. B

    Angular momentum: bullet through block with rod and pivot

    7. 0/10 points All Submissions Notes Question: SerPSE8 11.P.037. Question part Points Submissions 1 2 0/5 0/5 4/100 2/100 Total 0/10 A wooden block of mass M resting on a frictionless, horizontal surface is attached to a rigid rod of length script i and of negligible mass. The rod...
  6. B

    Rotational Momentum of Rotating Rod with Masses

    [b]1. A rigid, massless rod has three particles with equal masses attached to it as shown below. The rod is free to rotate in a vertical plane about a frictionless axle perpendicular to the rod through the point P and is released from rest in the horizontal position at t = 0. Assume that m and d...
  7. K

    Moment of Inertia of a rod at an angle

    A rod has mass M and length L. Calculate the moment of inertia of the rod about an axis which is passing through its center of mass and forming an angle \theta to the rod. I drew a diagram on an xy-plane where the rod is on the x-axis and the center of the rod is at the origin. Chopping the rod...
  8. M

    Internal field in a long narrow rod

    Homework Statement A long narrow solid rod has an atomic density 5 \times 10^{28}m^{-3} each atom has a polarizability of 10^{-40} . Find the internal field when an axial field of 1 V/m is applied.Homework Equations im not sure what formula to use but here's one: p = E_{loc} \sum_{r} n_j...
  9. I

    Falling rod which is fixed at the pin

    Hi I am trying to solve this problem. I already got the answer but have some questions. A long uniform rod of length L and mass M is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a vertical position, as shown in Figure P10.61. At the...
  10. G

    Rod with current and magnetic field

    Homework Statement A rod of mass m and radius R rests on two parallel rails that are a distance d apart and have a length L. The rod carries a current I and rolls along the rails without slipping. A uniform magnetic field B is directed perpendicular to the road and the rails, pointing...
  11. G

    Ball drops onto rod on a fulcrum and launches another ball into the air

    Homework Statement A 4.80 -kg ball is dropped from a height of 10.5 m above one end of a uniform bar that pivots at its center. The bar has mass 8.00 kg and is 4.00 m in length. At the other end of the bar sits another 5.10 -kg ball, unattached to the bar. The dropped ball sticks to the bar...
  12. M

    Conservation of momentum and a uniform rod

    Homework Statement The uniform rod (length 0.60 m, mass 1.0 kg) in Fig. 11-54 rotates in the plane of the figure about an axis through one end, with a rotational inertia of 0.12 kg·m2. As the rod swings through its lowest position, it collides with a 0.20 kg putty wad that sticks to the end of...
  13. JJBladester

    Determine force exerted on rod & reaction

    Homework Statement A conveyor system is fitted with vertical panels, and a 300-mm rod AB of mass 2.5kg is lodged between two panels as shown. Knowing that the acceleration of the system is 1.5m/s2 to the left, determine (a) the force exerted on the rod at C, (b) the reaction at B...
  14. D

    Electric Potential Of Charged Finite Rod

    Homework Statement A thin rod extends along the z-axis from z=-d to z=d, carrying uniformly distributed charge along it's length with charge density lambda. Calculate the potential at P1 on the z-axis with coordinates (0,0,2d). Then find an equal potential at point P2 somewhere on the x-axis...
  15. M

    Finding Moment of Inertia - Rigid Rod Plus Disc System

    Homework Statement Consider a rigid rod-plus-disc system Find the moment of inertia of the pendulum as it freely rotates about the point P. The rod has a length 0.62 m, and the disc has a radius half that. The pivot at P is a fourth of the way from the end of the rod. The rod has a mass of...
  16. P

    Finding the Acceleration of a Rod in an X-Y Plane

    a rod is vertically placed in x-y plane a slight disturbance is given to it so that it is inclined at an angle (90-a) with the horizontal. find the acceleration of the centre of mass i think that the path followed by the centre of mass would be elliptical so its acceleration can be gsina
  17. C

    Looking for opinions on connecting rod failure

    Unfortunately the piston has disintegrated so we are unable to use that to form an opinion on this failure. Please let me know your thoughts, thank you! http://www.maperformance.com/gallery/pictures/rodfailure1.jpg [PLAIN]http://www.maperformance.com/gallery/pictures/rodfailure2.jpg...
  18. P

    Rod shortening of General Relativity

    Hi Guys, Is there a simple formula (like lorentz equations for SR) for rod shortening ALONG THE RADIAL (geodesic) that depends on gravitational potential. I realize that this is a theoretical case without rotation of the mass etc. If possible this formula should apply to a point of reference on...
  19. M

    What Causes a Rod to Slip on a Moving Truck?

    we have a truck in our game we have a rod against the wall of that truck, and we know the acceleration of truck when the rod start slipping... we just want to know what is acceleration and of rod when it start slipping.
  20. K

    Lagrangian Equation of motion for rod on pivot in gravitational field

    Homework Statement I am trying to get an equation of motion for the following (seemingly simple) setup. You place on a rod on a pivot. The rod's centre of mass is precisely over the pivot. Think of balancing a ruler horizontally on your finger. Gravity, of course acts downward. The...
  21. R

    What is the equilibrium angle of a rod in a hemispherical bowl?

    Homework Statement A hemispherical bowl is fixed with its rim in a horizontal plane. Into the bowl is laid a rod of length equal to the diameter of the bowl. The rod is uniform. There is no friction at either point of contact. Find the angle between the rod and the horizontal when the rod...
  22. C

    Why are con rods failing in modified Honda CRF450 engines?

    Hi, I am an amtuer engine builder working on offroad race motorcycles. On the Honda Crf450 engines I have been working on, I have been having a large number off con rods failing in numerous ways. I have had the the con rod snap right below the piston with no sign of bearing failure. I've...
  23. O

    Rock On Rod Stewart: Am I a Universe-Rule-Changer?

    Experiment 1: I have a steel rod . I heat the rod to temperature T. As the rod heats up, it expands to length L. This makes me happy. I let the rod cool down and contract back to its original temperature and dimensions. Experiment 2: Now I place a heavy rock on top of the rod, and heat...
  24. A

    Max Diameter for a Steel Rod to Float on Water: Surface Tension Calculation

    Homework Statement Consider placing a short length of small diameter steel (specific weight =490 lb/ft^3) rod on the surface of water. What is the maximum diameter that the rod can have before it will sink? Assume the surface tension forces act vertically upward.Homework Equations volume of...
  25. T

    Solving for Net Torque on Uniform Mass Density Rod

    Homework Statement A rod has a uniform mass density of 0.05 kg/cm it has a moment of inertia equal to 0.1ML^2. The rod sweeps out an area equal to 0.25* pi meters squared in 4 seconds. If you apply a net torque of -1/16 Nm to the rotating rod, how many revolutions will the rod make before...
  26. P

    Combustion connecting rod failure (in cars)

    Hi all, I have this question from my friends and hope get the answer. Using your car with the oil is not sufficient, the connecting rod is the first to fail. Normally it burns both bearings or the smaller one (connecting to piston) burns first? I think there's a dilemma here: the bigger one...
  27. D

    Why derive electric field produced by a rod?

    Is there a practical utility to derive the electric field produced by a charged rod (and the 1/r dependence at great distance)? I know it can be useful to derive the electric field produced by a large plate since you can then show that the field between close parallel plates that are oppositely...
  28. D

    A Semi- Infinite Conducting Rod

    Homework Statement 25. A semi-infinite nonconducting rod (i.e. infinite in one direction only) has uniform positive linear charge density lambda. Show that the electric field at point P makes an angle of 45 degrees with the rod and that this...
  29. J

    Finding the new diameter of a metal rod after tensile loading

    Homework Statement A metal rod with a 0.5 inch diameter is subjected to a 2000 lb tensile load. Calculate the resulting diameter of the rod after loading. Assume that the modulus of elasticity is 10,000,000 psi, Poisson's ratio is 0.33, and the yield strength is 21,000 psi. Homework...
  30. Y

    Ehrenfest / rod thought experiment.

    This is new thread on an issue that was that getting slightly off topic in the original thread. Let's consider a slight variation of the Ehrenfest experiment. The fairly rigid carriages are all linked together by elastic couplings and are on a suitably highly banked track. As the...
  31. M

    Equilibrium temperature distribution for rod of 2 materials

    1. Determine the equilibrium temperature distribution for a one-dimensional rod composed of two different materials in perfect thermal contact at x=1. For 0<x<1, there is one material (c\rho=1, K=1) with a constant source (Q=0), whereas for the other 1<x<2 there are no sources (Q=0, c\rho=2...
  32. C

    Length contraction and rod falling thorough a grate ?

    If i have a rod of length L at rest . And there is a hole up ahead that is L/2 and I move the rod at a velocity which will contract it to half its rest length. Will the rod fall into the grate? Well I think that from the rods point of view its still its rest length and it would appear...
  33. B

    Moment of Inertia of 2-Spheres Connected by Rod

    Homework Statement What is: Moment of inertia of two solid spheres, radii each r[0], attached by massless rod which is also of length r[0], so that the distance between the two solid spheres' centres is "3*r[0]"? The axis of rotation could either be 1) through both spheres and along the...
  34. G

    Exploring EM Diffusion and Scattering by a Rod: Analytical Possibilities

    [EM] Scattering by a rod Hello everyone :) I'm interrested by the diffusion of an electromagnetic field by a rod with rectangular section i.e. a parallelepiped with one infinite dimension. Does anyone know if that's already been done ? If it is even possible analytically ? Thanks in...
  35. C

    Why is the length L divided by 2 in physical pendulum calculations?

    physical pendulum--thin rod Why do you have to divide the length L by 2 in these cases? The explanation that's provided in my book says "the distance L between the pivot and the center of gravity is .5 the length L." This makes no sense whatsoever. The length should be the same regardless of...
  36. J

    What is the Angular Speed of a Falling Rod?

    Homework Statement A rod of length L and mass M is pivoted about one end. The rod is released from rest in a horizontal position, and allowed to swing downward without friction or air resistance. When the rod is vertical, what is its angular speed w? Homework Equations Moment of Inertia...
  37. T

    Conducting rod through a magnetic field

    There is this conducting rod being moved to the right a constant speed v by a mechanical force F along 2 parallel , smooth, and horizontal conductors in a uniform vertical magnetic field of flux density B. The question is why is the speed constant although its being moved by a force ,F...
  38. K

    Relative velocities at ends of rod

    This isn't any kind of homework question. It's a design problem for a mechanical device I'm building. Two surfaces at right angles to each other, e.g. the corner of a room. If I place a rod across the corner with a wheel on each end and push one end (A) towards the corner (B), the other end...
  39. R

    Finding Angular Acceleration of Uniform Rod

    Homework Statement A uniform rod of length 0.750 m and mass 1.20 kg is pivoted at one end by a smooth pin as shown below. The rod is released from the vertical position and given a slight nudge to release it from the vertical position of unstable equilibrium...
  40. xortan

    Heat transfer through a steel rod

    Homework Statement Hello everyone I am studying for my finals and this question has me stumped. The ends of a cylindrical steel rod are maintained at two different temperatures. The rod conducts heat from one end to the other at a rate of 10 cal/s. At what rate would a steel rod twice as...
  41. M

    Determining Acceleration of Collar P on Rod AB

    [b]1. The collar P slides outward at a constant relative speed u along rod AB, which rotates counterclockwise with a constant angular velocity of 2π/3 rad/s. Knowing that r=10 in when θ=0° and that the collar reaches B when θ=90°, determine the magnitude of the acceleration of the collar P...
  42. B

    Calculating Power: Torque on a 20 Kg Rod Pivoted at 6m | 500 Rad Rotation

    A 20 Kg slender rod pivoted at its center has a length of 6 m. A motor applied a torque of 2400 Nm on the rod to turn it from rest. (a) Find the average power by the motor when the rod rotates an angle of 500 rad. _____________________ (b) Find the instantaneous power of the motor at the...
  43. U

    Finding angular acceleration of 2 masses on a rod

    Homework Statement A uniform rigid rod with mass Mr = 5.9 kg, length L = 2.9 m rotates in the vertical xy plane about a frictionless pivot through its center. Two point-like particles m1 and m2, with masses m1 = 5.7 kg and m2 = 1.8 kg, are attached at the ends of the rod. What is the...
  44. M

    Torque of a uniform rod being pivoted.

    Homework Statement A uniform rod 1.1 m long with mass 0.7 kg is pivoted at one end, as shown in Fig. 9-46, and released from a horizontal position. Find the torque about the pivot exerted by the force of gravity as a function of the angle that the rod makes with the horizontal direction. (Use...
  45. P

    Rod shortening - physical reality?

    Hi Guys, I seem to have gone in circles YET AGAIN! When discussing the expansion of the Universe I was told by friends that masses and objects do not expand with space because the forces within the mass are so much stronger than the inflationary force. When discussing General relativity we...
  46. A

    Conducting Rod in Electric Field

    If an uncharged conductor, a metal rod say, is placed in a uniform electric field E, parallel to the field (see figure), does it develop a potential difference between its two ends? If so, how is the potential difference related to the field E?
  47. F

    What is the integral of a thin rod's electric field?

    Homework Statement We have a thin rod of length 10 cm uniformly charged with a total charge of + 40 nC . A small glass bead charged to + 6 nC is located 4 cm from the center of the rod. What is the force on the bead? Homework Equations E = integral of K dq /r^2 and Q = lambda L and...
  48. D

    A neutral metal rod in a uniform magnetic field

    Homework Statement A neutral metal rod of length 0.35 m slides horizontally at a constant speed of 9 m/s on frictionless insulating rails through a region of uniform magnetic field of magnitude 0.6 tesla, directed into the page as shown in the diagram. Before answering the following...
  49. J

    Calculating Mass of a Long Thin Rod

    Homework Statement A long thin rod lies along the x-axis from the origin to x=L, with L= 0.750 m. The mass per unit length, l (in kg/m) varies according to the equation l = l0 (1+1.110x2). The value of l0 is 0.500 kg/m and x is in meters. Homework Equations stated in equation The...
  50. L

    Calculating electron mobility in a rod

    Studying for final, this is one of the suggested questions, I have no idea how to approach it. Homework Statement A cylindrical aluminum rod of 2 mm in diameter and 5 cm in length has a thermal conductivity of 237 W m-1 K-1 at 300 K. Calculate the electron mobility in the rod if aluminum...
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