Rod Definition and 1000 Threads

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. Titan97

    Thermal expansion of a rod with variable alpha

    Homework Statement The coefficient of linear expansion of a rod of length 1 meter (at 300K) varies with temperature as ##\alpha=\frac{1}{T}##, where T is the temperature. Find the increment in length when the rod is heated from 300K to 600K Homework Equations $$\Delta L=L\alpha \Delta T$$ The...
  2. annoyingdude666

    Why infinite conducting rod - Gauss's Law , uses lambda?

    hi, i still don't understand why infinite thin-walled cylindrical shell or conducting rod use lambda rather than sigma ? lambda = C/m ,,, sigma = C/m^2 i mean when we look at conducting rod, the charges inside the conductor is zero, so the charges spread on the surface of conducting rod(have...
  3. MusWolf

    Electric field at (x,y) from uniformly charged rod.

    Homework Statement A thin rod carries a charge Q distributed uniformly over its length L , and is situated on the x-axis between x=±L/2. Find the electric field at an arbitrary point (x, y). (You will have to do separate integrals for the x and y components.) Homework Equations ∫dE=∫kdq/r2...
  4. mattbeatlefreak

    How Do You Calculate the Electric Field of a Nonuniformly Charged Rod?

    Homework Statement A thin rod of length 2ℓ has a linear charge density that is λ0 at the left end but decreases linearly with distance going from left to right in such a way that the charge on the entire rod is zero. What is the magnitude of the electric field along the rod's axis at a...
  5. J

    What is the Charge on the Farther Half of the Rod?

    I'm totally confused what the question is asking. I do not know how to start... please help A charged sphere with 1×108 units of negative charge is brought near a neutral metal rod. The half of the rod closer to the sphere has a surplus charge of 2×10^4 units. What is the magnitude of the...
  6. C

    Rod rotating about pivot with spring

    Homework Statement Consider the following classic problem: we have a rod in the vertical position with a pivot at its midpoint and a spring attached to the bottom of the rod, perpendicular to the rod. The is rotated through a small angle theta to the vertical, and released. Find the period of...
  7. C

    A rod falling on a frictionless surface

    Homework Statement Consider a massless rod of length $L$ with a small mass $m1$ attached on one end, and $m2$ attached on the other end. The rod is initially in the vertical position at rest on a frictionless surface, with $m1$ on bottom and $m2$ on top. A small impulse is applied to the top...
  8. S

    Strain Energy in a Rod Question

    Unsure which dimensions to use to work out the force and strain energy here. I know that Force = yield strength * area Yield strength = 310 MPa Area, I'm unsure which radius to use. I assume 12 mm. For strain energy = (Force^2 * Length)/(2 * Area * Youngs Modulus) Unsure which length and...
  9. A

    Difference between Rotation Inertia of Rod V.S Cylinder

    A rod and Cylinder with a same axis of rotation relative to its body have different rotational inertia equation. WHY? Thanks in advanced.
  10. S

    Work Done by Spring on a Body Sliding down a rod

    1. The Question Unable to find the work done by spring on the object sliding down the rod as shown below: Homework Equations Work Done by Spring Force : -1/2 * KΔx2 --(1) where k = Spring Constant Δx = Change in Spring Length[/B] 3. Where the problem occurred While seeing the solution...
  11. Chrono G. Xay

    Center of Mass of Non-Uniform Rod Using Piecewise-Defined Function?

    How would one go about finding the center of mass of a non-uniform rod when its cross-section has been modeling using a piecewise-defined function? For a specific case let's use a drumstick, noting its volume as a sum of half of a sphere (the 'butt' end), a cylinder (the 'shaft'), the majority...
  12. A

    Sliding Rod and Rotating Disc Question

    Homework Statement A uniform rod AB of length L and mass m1 is connected by a pin joint to the center of a uniform disc of radius R and mass m2. The system is placed in a vertical plane (as shown in Figure 2) and released from rest with θ=45°. (a) Draw the free-body diagrams for the rod and the...
  13. (Ron)^2=-1

    Two masses attached by a rod orbiting around the Earth

    Hello guys! I hope you can give me a hand with this one Homework Statement A satellite consisting of two masses attached by a rigid-massless rod of length L, are orbiting around the Earth at a distance R from the centre of the earth. During the entire movement the rod stays oriented in the...
  14. Alettix

    Angular velocity of a rod - translational KE?

    Hello! :) When solving a problem, I had to calculate the angular velocity of a homogenius rod when it comes to vertical position, after being released from a horisontal position (the rod is fixed at one end). This is as usually done with energy conservation, using the rotational energy of the...
  15. I

    A rod in free fall with varying length

    Suppose you have a weightless rod with at the endpoints two masses. This is a special rod whose length varies in time as a function L(t). If I consider this rod in free fall my intuition is that this rod will rotate for suitable L(t). However, I want to write down the equations of motions for...
  16. B

    Acceleration at the tip of a rotating flexible rod

    Hello,I have a setup which has a flexible rod that is rotated by a motor. The motor has encoder unit on it which gives the position in quad counts. This we can easily convert to degrees or radians. I have made many tests and the readings are perfect. So I used the plot of the position values and...
  17. ft92

    Longest Wavelength of Standing Wave on Clamped Metal Rod

    Homework Statement An otherwise free metal rod of length L = 67-cm is clamped at a point L/18 from one end. A standing wave is set up on the rod. What is its longest possible wavelength? The Attempt at a Solution where do I go wrong? thanks
  18. L

    How hard must you hit a rod for it to swing up 180 degrees?

    Homework Statement A thin rod, 0.79 m long, is pivoted such that it hangs vertically from one end. You want to hit the free end of the rod just hard enough to get the rod to swing all the way up and over the pivot. How fast do you have to make the end go? Homework Equations P(change in...
  19. B

    Dynamics - Pulley System with Rotating Rod

    Homework Statement At the instant shown, the rod R is rotating about its centre of rotation with ω=3.8rad/s. mA=10kg; The pulley, with mP=8.7kg and RP=0.2m, may be modeled as a uniform disc. The rod, with mR=4.1kg and L=0.8m, may be modeled as a thin beam rotating about one end. g=9.8m/s ²...
  20. W

    Direction of tension of metal rod

    Homework Statement the metal rod is supported by another metal rod at one end . The metal rod is supported by another metal rod at the end. so , the direction of tension of metal rod is acted upward , right ?( this is the initial prediction) But , i was told that the tension that we get from...
  21. M

    Connecting rod failure Hyundai Veloster 1.6

    I purchased this car new 2013, 29,999 miles and the dealer has been the only one who worked on it. We use synthic oil. After driving the last 100 mile at 60 mph the engine stopped. I had it towed to the dealership. The lower end of #4 con rod was sticking out of the Aluminum block. The...
  22. V

    How can the motion of point A be determined in this system?

    Homework Statement Homework EquationsThe Attempt at a Solution When string joining B is burnt , the forces acting on the rod are its weight , and tension in the left string ,both being vertical ,the acceleration of its COM would be vertical . Hence option A is correct . Now how should...
  23. Multiple_Authors

    Insights Can I Send a Signal Faster than Light by Pushing a Rigid Rod? - Comments

    Multiple_Authors submitted a new PF Insights post Can I Send a Signal Faster than Light by Pushing a Rigid Rod? Continue reading the Original PF Insights Post.
  24. V

    How Do You Calculate the Angular Speed of a Rod?

    Homework Statement Homework EquationsThe Attempt at a Solution If I interpret "magnitude of displacement of CM per sec " as Velocity of CM ,then Horizontal Impulse provided to the rod = J ##J = MV_{cm}## Angular impulse about the CM = JL/2 ##\frac{JL}{2} = I \omega ## ,where ##I =...
  25. T

    A plastic rod 1.9 m long is rubbed all over with wool

    Homework Statement A plastic rod 1.9 m long is rubbed all over with wool, and acquires a charge of -6e-08 coulombs. We choose the center of the rod to be the origin of our coordinate system, with the x-axis extending to the right, the y-axis extending up, and the z-axis out of the page. In...
  26. P

    What would the final charge on the rod be?

    I had a question. If a glass rod, with a charge of 5.4x108 C touched another insulator so that all of the excess electrons are shared equally. What would the final charge on the rod be? I don't understand how to reach the answer of 2.7 x108 C. Thanks in advance. :)
  27. ToonBlue

    Electric field insulating rod Question

    Homework Statement Homework EquationsThe Attempt at a Solution This is problem I have found online and this is the part I don't understand how they come up with this. How did they get this for the x component since y component cancel out due to being symmetry ?
  28. gracy

    What is the Work Done by a Heated Metal Rod?

    Homework Statement a metal rod of length "L",cross sectional area "A",young modulus "Y" and coefficient of linear expansion "α " is heated to "t" degree celsius .The work that can be performed by the rod when heated is Homework Equations work done by rod when heated=1/2 force exerted by...
  29. gracy

    Current in metal rod of gold leaf electroscope -- is it there?

    In gold leaf electroscope from the following video I have a doubt From time 2:11 to 2:14 flow of negative charge i.e flow of electron won't it cause current?
  30. Adoniram

    When does the bead fly off the rod?

    Homework Statement A rod of length L is fixed at one end, and rotates in the X-Y plane with angular velocity ω. (To be clear, it is sweeping out an area of ##π (L/2)^{2}##.) A bead starts at position ##r(0)=L/2## with ##\dot{r}(0)=0##. Find ##r(t)## and the time it takes for the bead to fly...
  31. G

    Electric potential at center of charged rod

    Homework Statement Find potential of a uniformly charged rod of length 2a Homework Equations -Superposition The Attempt at a Solution dV=\frac{kλdx}{r}, r=x V=λk\int\limits_{-a}^a \frac{1}{x}\mathrm dx=0 Potential at point B is zero. Is this correct?
  32. B

    Mathematical modeling of the deflection of a rod

    A rod is radially mounted on a motor shaft and provided with a flat end plate. By turning movement, the end plate will touch a pointed object, and the angle turned is measured.By the torque of the motor during acceleration and deceleration, a vibration and deflection happens on the rod. The...
  33. 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...
  34. L

    Find the angular acceleration of the rod

    Homework Statement Given: ##\mu_B=0.52## ##\theta=30^{\circ}## Weight- ##25## lb ##\omega=0## ## l=6## ft ##r_c=3\sqrt 2## radius of curvature. Homework Equations My Equations of motion are the following: ##\xleftarrow{+}\sum F_x=N_A\sin 60 - F_B=0## ##\downarrow{+} \sum F_y= N_A \cos...
  35. B

    Experiment of water defection with a charged rod

    Homework Statement A student designs an experiment to measure how electrically charged a plastic rod is. She knows a charged rod will deflect a stream of water from a tap. The student plans to measure the angle of defection of the water stream when she brings the rod towards it. She expects...
  36. Mnemonic

    Cylindrical Gaussian Surface around charged rod

    Homework Statement a) 21.4-nC of charge is placed on a 4.8-m long steel tube with a d = 5.9-cm diameter. What is the magnitude of the electric field as a radial distance of r = d / 3? b) What is the magnitude of the electric field as a radial distance of r = 20 d? I was able to determine the...
  37. K

    Ball hitting a hanging rod: Velocity and Energy Loss Analysis

    Homework Statement A rod of length L hangs on a nail. a ball of mass m hits and sticks to it. the rod rotates to angle θ. What is the velocity of the ball and what's the loss of energy. Homework Equations Kinetic energy of a rigid body: ##E=\frac{1}{2}I\omega^2## Angular momentum...
  38. C

    Induced voltage from a rod sliding on rods in a B-Field

    Homework Statement Two long rods with distance between them a=100mm, over those two rods there's another rod sliding, friction between them is negligible. The rods are placed in homogenous magnetic field whose B is equal 1T, with direction shown in the picture, between the rods there is voltage...
  39. S

    Offset crank slider mechanism connecting rod analysis

    Homework Statement A) Determine the value of the angle θ (measured from vertical) when the angular velocity of link AB a maximum. B) What is the maximum angular velocity of link AB. Homework EquationsThe Attempt at a Solution This is a part of a bigger question. I've managed to answer all...
  40. M

    Finding Acceleration and Reaction Forces in Rotating Thin Rod on a Hinge

    Homework Statement A thin rod of mass 0.620 kg and length 1.08 m is at rest, hanging vertically from a strong, fixed hinge at its top end. Suddenly, a horizontal impulsive force (14.2 i ) N is applied to it. (a) Suppose the force acts at the bottom end of the rod. Find the acceleration of its...
  41. andyrk

    Rotating Rod Tension: Variations with Rotation Angle

    Why does tension across a rod rotating horizontally vary when it is rotating about one end?
  42. A

    Comparing Coefficients of Thermal Expansion in Solid Rods

    Homework Statement the difference in length between an aluminium rod and a copper rof at 0 degreeC is 2cm. If they have the same difference in length at any temperature difference, what are the length of the 2 rods at 0 degreeC.? Al - expansivity = 20*10^-4 K^-1 Cu- expansivity= 15*10^-6 K^-1...
  43. K

    Angular Velocity and Acceleration of a Rotating Rod: Homework Problem

    Homework Statement A rod of length L and mass m which is free to rotate round it's edge is held, initially, horizontally. What are: the angular velocity and acceleration at angle θ The force at the nail (the axis) Homework Equations Torque and moment of inertia: ##M=I\alpha## The Attempt at...
  44. K

    Rod rotating, falling and hitting a mass

    Homework Statement A rod of mass M and length L is in the initial position at angle θ and pivoted at the lower end. It is released and at arriving to the equilibrium state it hits elastically a mass m that slides on a surface with the friction coefficient ##\frac{\mu}{L}x## What's the angular...
  45. B

    Angular Momentum of a Uniform Rod

    << Mentors have notified the OP to show their Attempt at a Solution >> 1. Homework Statement A uniform rod of length L1 = 1.5 m and mass M = 2.8 kg is supported by a hinge at one end and is free to rotate in the vertical plane. The rod is released from rest in the position shown. A particle of...
  46. T

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

    Homework Statement A uniform rod AB of length 3R weight W rests inside a hemispherical bowl with radius of R. Determine the angle corresponding to equilibrium. Homework EquationsThe Attempt at a Solution [/B] Moment about A: -1.5R*mg cos(theta)+B*AB=0 Sum Fx: Acos(theta)-mg sin(theta)=0 Sum...
  47. G

    Find electric potential at a center of charged rod

    Homework Statement Find electric potential at a center of charged rod with charge 'Q' and length '2a' if referent point is at infinity. Homework Equations Electric potential of a point charge: V=kQ/r Electric potential via electric field: integral (Edl) The Attempt at a Solution I used...
  48. E

    Thin Rod Gravitational Potential and Field Vector

    Homework Statement I am having a hard time understanding where to begin with this problem. Here it is: Consider a thin rod of length L and constant density n that lies on the x-axis with endpoints at x=0 and x=L. (i) Find a formula for the gravitational potential Φ = Φ(x) at the (variable)...
  49. omega5

    Rings on a rod: angular momentum conceptual question

    Homework Statement A uniform rod of mass 3.15×10−2kg and length 0.380m rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. Two small rings, each with mass 0.250kg , are mounted so that they can slide along the rod. They are initially held by catches...
  50. C

    Why the Shapiro delay is calculated with respect to the....?

    Why the Shapiro time delay is calculated with respect to the difference in coordinates and not with respect to the physical distance? I follow the discussion of Clifford (Theory and Experiment in Gravitational Physics) which uses isotropic coordinates and PPN approximation. To make more clear my...
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