Cable Definition and 629 Threads

A cable layer or cable ship is a deep-sea vessel designed and used to lay underwater cables for telecommunications, electric power transmission, military, or other purposes. Cable ships are distinguished by large cable sheaves for guiding cable over bow or stern or both. Bow sheaves, some very large, were characteristic of all cable ships in the past, but newer ships are tending toward having stern sheaves only, as seen in the photo of CS Cable Innovator at the Port of Astoria on this page. The names of cable ships are often preceded by "C.S." as in CS Long Lines.The first transatlantic telegraph cable was laid by cable layers in 1857–58. It briefly enabled telecommunication between Europe and North America before misuse resulted in failure of the line. In 1866 the SS Great Eastern successfully laid two transatlantic cables, securing future communication between the continents.

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  1. S

    Control cable failure and critical flutter speed margin?

    Hi everyone here! I'm a LSA and PPL pilot, working on my CPL, and I have some questions to those who have knowledge of the aeroelastic effects and flutter phenomenon. I would like to talk a little about aerodynamic flutter onset speed and flight control malfunction. It is known that freeplay...
  2. P

    How to determine the diameter of a cable

    A Cable that has a yield strength of 620 MPa and a safety factor of 3. This cable must be able to support 5 buckets which must be able to carry up 5,429.554 kg each. Bucket mass is negligible. Stress = Mass/Area Area = force/stress My attempt at a solution: Total weight 5 buckets must...
  3. C

    Normal strain of cable through arc

    Homework Statement See attachment Homework Equations eAB=(Lf-Lo)/(Lo) The Attempt at a Solution Ok, this is not for HW. I am preparing for a mechanics of materials class next semester. I don't understand when CB goes through the 0.3 degree arc, they say the height is still 300mm. Shouldn't...
  4. P

    Factors affecting speed of travelling waves along a cable

    I have a question concerning the speed of propagation of a traveling wave along a cable. If I have a cable and I move one end in a direction perpendicular to that of the length of the cable, it will generate a wave/pulse which will propagate along the cable with some speed. I imagine this speed...
  5. R

    What equations can I use to find the tension in this cable? Transverse pulse ?

    What equations can I use to find the tension in this cable?? "Transverse pulse"?? I know I'm given the following but I have no idea what equation to use...does anyone know? Mass: m = 0.180 kg Length: L = 4.20 m μ = mass (m) / unit length of cord (L) Time for 4 trips down and back: 0.845 s...
  6. B

    Stress on a beam supported by mass-less cable, friction at play, no angle given

    Homework Statement One end of a uniform 3 m beam, that weighs 15 N, is supported by a mass-less cable. The other end rests against the wall. The coefficient of static friction between the wall and the beam is μs=.5 Figure: http://i.imgur.com/Ad9R2.jpg?1 Determine the minimum distance x...
  7. Z

    How Much Light Can Fiber Optic Cables Carry?

    I am trying to design a system that will carry light for illumination along a fiber optic cable. I see that there are many thicknesses of fiber optic cable - however I am unsure of the purpose of this. I've never heard of a 'density' of light that you can put into a cable - is there such a...
  8. C

    Solving Cable Tension Problem with Given Angles and Mass

    Homework Statement Two cables are attached to a 16.00 kg mass, or 160 N (Our teacher told us to use 10 for gravity). The angle between the cable on the left and the ceiling is 48 degrees. The angle between the cable on the right and the ceiling is 22 degrees. Calculate the tension in the cable...
  9. D

    How do cables bend and curve when fixed at two points?

    Hi I have a cable that is fixed at 2 points, and I would like to model the curve that it bends as the two points move together and further away. In one scenario, the cable is fixed at both ends (one above the other) like a "C". In the other scenario, both ends are also fixed in clamps, but...
  10. C

    Carnival ride : chair swings from cable attatched to overhang, spinning on axis

    Homework Statement The chair is 10 m from the rotating vertical axis. The solid overhang stretches 6 meters from the axis. (making 4 m from end of overhang to chair on the radial axis). The chair spins at a constant speed at 1 revolution per 10 seconds. Find the angle θ the cable makes with...
  11. J

    Finding the unstretched length of a bungee cable

    Two men both weighing 150lb jump off a bridge using a bungee cord with stiffness k=80lb/ft. One of the men is attached to the cable and plans to release the other man when they reach the water 120ft below the bridge. Once there the connected man will let go of the unconnected man when they...
  12. J

    Cable tension force from applied force

    Hi, I am a bit confused about cables, because of multiple people telling me different things. The only times we've discussed cables/springs is when a force is applied parallel to the length of the cable. So say you had a cable tied to 2 fixed ends ------------------ , (great diagram eh) and a...
  13. N

    Determine the Reactions at O and the Cable Tensions

    Homework Statement The light right-angle boom which supports the 520-kg cylinder is supported by three cables and a ball-and-socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions. Homework Equations The Attempt at a...
  14. J

    Buy Cable Strain Relief | Mouser, Amazon & Beyond

    Where can I buy strain reliefs? All I could find on Amazon are 6,000 different kinds of RJ-45 booties, which are not what I'm looking for. Mouser is impossible for things like this unless you already know exactly what you are looking for. I quite like the strain relief used on the LeCroy...
  15. A

    Object suspended by two cables, what are the tensions of each cable?

    Homework Statement Consider there is a 634 N weight held by two cables that meet at a point above the weight. The left cable with tension T sub 2 makes an angle of 46° to the horizontal. The right cable with tension T sub 1 makes an angle of 40° to the horizontal. a) What is the tension in...
  16. R

    Find the tension in each cable Physics Problem -

    "Find the tension in each cable" Physics Problem -- Please Help 1. A 162.4-N bird feeder is supported by three cables as shown in the figure below. Find the tension in each cable. Left cable: __140__ N Right cable: __80__ N Bottom cable: __162.4__ N SOLVED! :D
  17. W

    Which method has better noise immunity for connecting a PLC to an office PC?

    Hi, I want to connect my PLC at the control panel board to my office PC. There are two ways available for me to connect it. One is by using RS485 and one is by ethernet cable. The main concern is the cable has to travel for a far distance, about 7.8meter and the environment is full of...
  18. S

    Why does every cable have 2 different tensions?

    Homework Statement I was recently introduced to the concept of non-massless cables. I am used to solving problems where the cable is massless, and therefore tension on both ends of the cable are the same. However, my TA mentioned that this is only true in 3 instances. 1. If the cable is...
  19. N

    Differential Gauss's Law & Coaxial Cable

    Homework Statement A long coaxial cable consists of an inner solid cylinder, radius a, and an outer thin coaxial cylindrical shell, radius b. The outer shell carries a uniform surface charge density σ. Find the uniform volume charge density ρ that the inner cylinder must have in order that...
  20. F

    Modes and numerical aperture of a fiber optic cable

    Hello Forum, the numerical aperture NA of a fiber optics is given by the square root of the squared core index minus the squared cladding index. The NA indicates the angular ability to collect light from the outside of the fiber, i.e. the max semi-angle over which light will enter the fiber...
  21. N

    Magnitude of Cable Tensions and Compressive Force

    Homework Statement http://prntscr.com/fehze There's a diagram with a rough free body diagram implemented. Homework Equations This is what I'm really unsure about. The Attempt at a Solution Finding Compression at BC: mg*sin(60) = 8495N Tension AC = mg*cos(25) = 8890N Not...
  22. G

    First sem. calc physics: Cable tension (vectors and acceleration)

    So, I'm trying to understand how tension works between a cable. No, not homework. A book example. I have the answers. a = 0.679 m/s2 t = 12s So, I've seen the free-body diagrams. There is tension, sure, but the tension is in perpendicular directions. The book gives examples of tension in a...
  23. T

    Is Cable Length a Factor in Determining Coaxial Cable's Power Rating?

    I am trying to calculate the maximum power of a coaxial cable, based on heat transfer parameters and limiting temperatures of cable components. I've determined that a certain heat load on the conductor surface (in Watts per inch of cable) will put the dielectric above its operating temperature...
  24. A

    How many people needed to excite the lift cable to the 15th harmonic?

    ×Homework Statement A lift cable has mass per unit length 4kg/m. The lift has mass of 920kg (assume that the tension in the cable is provided solely by the weight it supports). When the lift stops at the 3rd floor, the distance from the top of the lift to the top of the cable is 4.6m. Assuming...
  25. E

    Can a thermocouple be used as a power cable?

    I am trying to find out if type K thermocouple is capable of transmitting power from an external power supply to a camera and some lamps attached on the end. I have 3 pairs of thermocouples. One pair for the camera supply. One pair for the video output. One pair for the lamps. I have tried...
  26. L

    Could a coaxial cable be used for electric current instead of radio signals?

    http://en.wikipedia.org/wiki/Coaxial_cable http://en.wikipedia.org/wiki/Poynting_vector Could a coaxial cable be used for electric current instead of radio signals? 'For example, the Poynting vector within the dielectric insulator of a coaxial cable is nearly parallel to the wire axis...
  27. K

    Find tension force of a cable and components of reaction force of pivot

    Homework Statement Please see attached photos. I've been drawing and re-drawing diagrams but I'm at a loss. For part a, I've tried a right triangle using the top cable as the hypotenuse. I've tried the force equation (ƩF=ma) but I don't think that's right. I just can't get a start...
  28. K

    Finding angle of cable when pendulum is at its highest point

    Homework Statement Please see attached photo. It is problem 54. My difficulty is that I am not sure if I marked out the correct forces in the work-force equation. Without the height, I can't find the angle. I was going to use the formula: Δx=radius (times) Δθ However, I'm not even sure this is...
  29. W

    Efficient Cable Calculation for Urgent Motor Circuit - Help Needed

    Good afternonn, these are the motor and circuit data: Motor power: 0.37kW, Nominal current: I= 0.8 A voltage: 415 V, cable length = 80m ambiant temperature: 50°C Maximum voltage drop percentage =415*4% =16.6V According to the Bahraini Regulations: - temprature factor= 0.89 - core...
  30. N

    Finding the maximum tension in a cable

    I was trying to solve this question: In a scrap yard, a car of mass 1200 kg is suspended from a crane using an electromagnet of mass 1400 kg.When the electricity is turned off the car is dropped. Assuming the spring constant for the crane and the supporting cable is 3.5 MN/m, find the maximum...
  31. B

    Doubt regarding the Ethernet cable

    Today I am seeing quiet a number of home appliances or entertainment devices (Eg. NEST Module) plugged-in to the Ethernet cable. Since I don't have much knowledge on this topic I have a little doubt. Just consider the example of NEST. In case, I have a NEST device installed in every room of...
  32. P

    Conductance per unit length of a co-axial cable (Intro to Electromagnetics)

    Homework Statement Starting with: G = \frac{I}{V}= \frac{-\int_{s}\sigma\mathbf{E}\cdot d\boldsymbol{s}}{-\int_{l}\boldsymbol{E}\cdot d\boldsymbol{l}} Derive the conductance per unit length, G', of a coaxial cable by assuming a line charge of \rho_{l} on the center conductor...
  33. D

    How Do You Test Coax Cable Assembly Characteristics Using a VNA and Smith Chart?

    I need to test a coax cable assy for loss, resistance (AC&DC?) capacitance and inductance? Using a VNA in smith chart mode, how is it done? Do I sweep the coax (S11) with the other end open, shorted and then terminated? I know sweeping S21 will give me the loss @ freq of interest. Its the...
  34. W

    Mastering the Solar System Design: Calculating Cable Loss

    i doing the solar system design. seem like everything is on track now, but just the cable loss i not really know how to calculate, can anyone help me. i has formula on this (resistance on the cable (Ω/km)x length of the cable(L) x current of the solar panel(A)). for the equation above , is...
  35. W

    Calculating DC Cable Loss for Solar System Design

    I'm doing the solar system design now . so far seem like everything is on track, but now i face a problem on the DC cable loss. is that has any formula to calculate the dc cable loss, i has using this formula is (losses of the cable (Ω/km)x length X current produce by the solar panel...
  36. B

    Which diameter of two core cable?

    Hello all, First time here and first time posting. Just like to say a quick hello before getting started... Due to the rise of solar PV panels being installed before the Feed in Tariff was cut earlier this year (in the UK) I've been thinking about the cable losses that these incur...
  37. S

    Static Equilibrium: A 1380 N uniform boom of length ℓ is supported by a cable

    Homework Statement A 1380 N uniform boom of length ℓ is supported by a cable, as shown. The boom is pivoted at the bottom, the cable is attached a distance 3/4ℓ from the pivot, and a 3604N weight hangs from the boom’s top. Find the tension of the cable. here is a picture of the diagram...
  38. Greg Bernhardt

    Cable companies to encourage pirating again

    It's amazing how clueless these guys are! I cut the cable cord 3 years ago and will never go back. I'm still super ticked I can't get ESPN3 unless I get a cable subscription. http://www.nypost.com/p/news/business/tv_in_real_dime_ph0GiKk7rC9agDUEkHae2I
  39. wukunlin

    What sort of cable connector is this?

    I don't think this is technical enough to post it in EE so I'm hoping someone in my project my supervisor bought this thing, it's power supply uses a cable shown in the attached image, problem is it is about a foot long. For the sake of a tidier work space we are trying to find an extension...
  40. T

    How to calculate tension in a cable

    If an aircraft is flying straight and level and drops a load but it remains attatched to the aircraft by a cable (hung load), how do I calculate the tension in the cable. I know the aircraft speed, the weight og the load and the length of the cable. Thanks
  41. K

    How do I calculate the cable tension for a 14 degree suspended drawbridge?

    (not a physics person so hope my description is clear enough) bridge mass = 3150 Newtons (center of mass is in center) length = 5 meters cable is attached to wall 3 meters straight up from bridge hinge cable is attached to bridge 3.5 meters from hinge situation: bridge is...
  42. B

    Where can I find reliable cable properties for lock-in amplifiers?

    Hey all, I'm doing an investigate into lock-in amplifiers and am looking for a book, or journal, which has a collection of properties/ characteristics for cables? For example, I'm particularily looking for a reliable source to quote the speed of propagation of a particular co-axial cable...
  43. J

    Tension in the cable of the lift

    Homework Statement The tension in the cable supporting a lift moving upward is twice the tension when the lift moves downward. What is the acceleration of the lift? Homework Equations The Attempt at a Solution i think its only conceptual but still please show me the way how to...
  44. Femme_physics

    Suspension cable statics calculus problem

    Homework Statement http://img706.imageshack.us/img706/7156/mecx1jpg.jpg Homework Equations http://img837.imageshack.us/img837/6987/equationsr.jpg The Attempt at a Solution I find myself with 2 unknowns, 1 equation. http://img708.imageshack.us/img708/4281/mecx2.jpg
  45. D

    CAT3- CAT6 differences in category of cable

    For general information, I would like to explain the differences between CAT3- CAT6 cabling. If you were to lay a twisted pair of any cabling, you would find that the twists per inch matched the category. CAT3; 3 twists per inch. CAT6; 6 twists per inch etc... Then is the issue of CATe cable...
  46. Femme_physics

    Resultant vectors in cable and beams

    I know that when I have cable connected, the resultant vector of each cable will point at the direction of the angle it's connected in. http://img26.imageshack.us/img26/8454/wiresn.jpg BUT, suppose we switch all these cables to rigid body structures like beams. I cannot make the same...
  47. P

    Solve Tension on Cable Homework: Find T for Elevator Mass 1320 kg

    Homework Statement An elevator in a tall building is allowed to reach a maximum speed of 3.89 m/s going down. What must the tension be in the cable to stop this elevator over a distance of 2.70 m if the elevator has a mass of 1320 kg including occupants? Homework Equations Vfy^2 =...
  48. Y

    Basic question from non-engineer about power cable specifications and safety

    Let me start by stating up front that I am not an engineer, but as far as I could tell, this "outsider" question does not violate the forum rules. I searched (Google and this forum) for an answer, but couldn't find one, and was confident readers of this forum could probably help. My boss's...
  49. A

    Need help finding plug/socket cable connectors

    Hi guys, I'm working on a project (a micromouse to be specific), and need an easy way to connect and disconnect some wires. The picture below shows some connectors I took from a computer fan, but I really need connectors with 4 pins instead of two. Can anyone help me with what these are...
  50. S

    Horizontal cable with one vertical point force

    Homework Statement Hang a weight (F) from the middle of a horizontal wire of length L, attached on both sides. The wire has an effective modulus (E) and effective area (A). Find an equation for the new length of the wire LF. (NOTE: Do not try to solve for a form LF =, this is too hard)...
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