What is Cable: Definition and 628 Discussions

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. F

    What is the Magnetic Field Inside a Cylindrical Coaxial Cable?

    I have no idea where to start.
  2. R

    Tension and net torque in a cable

    Homework Statement In figure 12-34, a uniform beam of weight 500N and length 3m is suspended horizontally, on the left it is hinged to the wall and on the right end of the beam is a cable attached to support it. the cable is attached distance D up the wall from the hinge. The least amount of...
  3. J

    with this tension problem -- Mass on an accelerating cable

    Homework Statement A 35 kg mass is being raised by a cable with decreasing speed. At the instant the upward velocity has a magnitude of 1.6 m/s and the downward acceleration has magnitude of 1.2 m/s2, what is the tension of the cable? m=35 kg v=1.6 m/s a= -1.2 m/s2 g= 9.81 m/s2 Homework...
  4. CheesyPeeps

    Struggling Engineering Student Needs Help with Tension in Cable Homework

    Homework Statement Homework Equations ∑MA = 0, where A is the pin. Tx = Tcos150 Ty = Tsin150 The Attempt at a Solution I've drawn in the 100kN force of the beam's weight, and identified that ∑MA = 0. I attempted to find the moment arm, but really wasn't sure how do to it, or if it would even...
  5. D

    Why does my phone remain connected to its cable when being lifted by the cable?

    Hi everyone, I noticed something strange when I lifted my phone by its cable. My phone will remain connect to the cable for a few seconds before it disconnects and falls. I understand that an object wouldn’t move unless a force has acted upon it. The fact that the phone remained connected for a...
  6. S

    Static equilibrium: Find the tension in a support cable

    Homework Statement Homework Equations Σtorque = 0 Σfx=0 Σfy=0 torque= F r sinθ (θ is the angle between the r and the F)The Attempt at a Solution OKay, now i know how to solve this, but it's like i asked myself, how to know if this is a question that i am supposed to use Σfx=0 and Σfy=0...
  7. E

    Calculating Linear and Angular Motion in a Drum and Cable System

    Hi, I'm studying a hnc in mechanical engineering. One of the maths problems I have been given involves a drum and cable. It states the diameter(0.8m), mass (3kg), initial velocity (0m/s), time to descend (0.5secs) and distance traveled (0.25m) I need to find: A)final linear velocity of the...
  8. Another

    Problem about electric potential and power transmitted down a cable

    When to use ## V =-\int E ⋅ dl ## or ## V =\int E ⋅ dl ## ? When i use ## V =-\int E ⋅ dl ##. i can not show that P = IV because ##\frac{ln \frac{b}{a}}{ln \frac{a}{b}} ≠ 1## But the solution use ## V =\int E ⋅ dl ## I'm concerned about using "minus" .
  9. cpcoe

    AC vs DC servo motors in large scale cable robot design

    hi, I'm designing a 50ftx50ft, 8-cable Cable Driven Parallel Robot and am thinking this is a pivotal decision. the corner posts are 10ft tall and the machine should be able to lift 100lbs at least 5ft off the ground. traveling speed of the end effector is less important than accuracy but I'm not...
  10. S

    Does Light Travel Through Fiber Optic Cable Generate EMF?

    Does light traveling through a fiber optic cable generate any sort of detectable electromagnetic field? Please forgive the stupid question. It’s something that popped into mind recently and google hasn’t adequately answered for me. I’m not a scientist or physicist. :blushing:
  11. G

    Insulation test of a long cable

    In order to do some welding a long way from a power socket, I have made up a 200m long ‘extension lead’ from some 6mm2 armour cable. The cable is needed for another job later on. I have an test unit that: 1. Checks earth/ground bond with 8Vac and 25A. 2. Then measures insulation resistance...
  12. R

    How to calculate the cable size between QRM and transformer

    cable size calculation between QRM and 11kv to 400v transformer (1500 kva)
  13. G

    Powerline cable count and engineering question (HV power distribution lines)

    I have seen that typically most 110Kv and 330Kv lines around my place have not 4 wires on them (3 phases and one neutral) but rather 7 wires on them, which I suppose is 3 phases x2 which probably means two cables for each phase and a common neutral wire at the top of each post. Now is my...
  14. Cheesycheese213

    How do phone chargers work? (thin cable question)

    We're all told how circuits have to be closed and loop back to be able to have the electrons flowing and give things power, so is that the reason most outlet charges have two wires connected? If so, why are phone chargers only one wire, and how are they so thin? Thanks!
  15. B

    Calculating Resistance of Coaxial Cable with Isolator

    Homework Statement Coaxial cable has radius a of copper core and radius b of copper shield. Between there is an isolator with specific resistance ζ. What is the resistance of this cable with length L between the core and the shield? Homework Equations First, I tried to solve this like this...
  16. Ignitia

    Ampere's Law with a coaxial cable

    Homework Statement A portion of a long, cylindrical coaxial cable is shown in the accompanying figure. A current I flows down the center conductor, and this current is returned in the outer conductor. Determine the magnetic field in the regions (a) R ≤ r1, (b) r2 ≥ R ≥ r1, (c) r3 ≥ R ≥ r2, and...
  17. Physics345

    Space Elevator Cable: Physical & Chemical Properties

    Homework Statement a) research the space elevator concept. Consider the environment in which the cable must operate. Recommend two physical and one chemical property that the cable should have. Justify your choices. b) Based on what you have learned about bonding and forces in solids, which...
  18. B

    Refractive Index of Coaxial Cable

    Anyone know the refractive index of a standard coaxial cable and have a traceable source?
  19. A

    The magnetic field outside a coaxial cable

    Good day All, I have a confusion in my mind and i hope to clear it If we use the Amper law to calculate the magnetic field outside the cable, the value would be 0 because the electric current inside the amperian loop is equal to 0, but in case we apply the Biot savart law to calculate the...
  20. D

    Magnetic fields outside a shielded power cable

    I was recently having a discussion about magnetic fields outside of a shielded power cable. My understanding up to this point was shielded cables only shields electric fields and not magnetic fields which are associated with current flow inside a cable. For the shielding to shield magnetic...
  21. D

    How Is the Minimum Bend Radius of a Fiber Optic Cable Determined?

    If there is a fiber optic cable with a diameter d, the index of refraction of the cladding the cable is given, and so is the index of refraction core of the cable, how would you formulate an equation for the minimum radius of bend the cable can have? Thank you in advance.
  22. Marcus95

    Power Transmitted in a Coaxial Cable

    Homework Statement A coaxial transmission line consists of an inner cylindrical conductor of radius a = 1 mm and a cylindrical outer conductor chosen to make the characteristic impedance 75 ohm. The space between the conductors is lled with a gas which can stand a maximum eld of 105 V/m without...
  23. T

    Impacted on a Surface wave of a tension-ed Anchor cable

    I'm trying to figure out what happens to a tension-ed anchor line when encountered by a surface wave (transverse and longitudinal ) Assuming a 2 dimensional view, or that the cable is sufficiently wide that the wave cannot go 'around it' what happens to the path and speed of the surface wave...
  24. E

    Weight held by a beam and cable

    I've got a problem where a weight is being held to the side of a building using a beam and a cable. The weight is 336 pounds and the angle between the cable and the beam is 49 degrees. I need to calculate the tension of the cable and the force of the beam. I calculated the force of gravity as...
  25. G

    Energy Flow in Coaxial Cable with Linear Free Charge Density

    Homework Statement An infinitely long cylindrical capacitor with inner radius a and outer radius b carries a free charge per unit length of ##\lambda_{free}##. The region between the plates is filled with a nonmagnetic dielectric of conductivity ##\sigma##. Show that at every point inside the...
  26. F

    Ionized Gas Cables: Can You Buy Them?

    Hi! Does it exist cables using ionized gas / plasma as the conductor available to buy? Thanks in advance!
  27. P

    Suspending a Speaker: What is T in each cable

    1. The problem statement, all variables, and given/known data Homework Equations Assuming standard coordinates, Net forces in the x plane are 0, by The Attempt at a Solution I have worked out that \arcsin { \left( \frac { 1.4 }{ 3.1 } \right) } =\quad 26.8{ 5 }°\\ loud\quad...
  28. C

    Underground cable with electrical short

    Homework Statement A 10-km-long underground cable extends east to west and consists of two parallel wires, each of which has resistance 13 ohm /km. An electrical short develops at distance x from the west end when a conducting path of resistance R connects the wires (Fig. 27-31). The resistance...
  29. G

    Coaxial cable conductors with dielectric: polarization of charge

    Homework Statement Consider a coaxial cable which consists of an inner cylindrical conductor of radius R1, and a shell cylindrical conductor of radii R2 and R3. The 2 conductors are separated with a dielectric material of permittivity ε. Consider the length of the cable, ℓ, much larger than R3...
  30. B

    Determine a cable core diameter for RF current carrying loop

    Basic Question Alert ! (I need to brush up my basics and need your help) Problem Statement: I wish to make a current carring cable loop to generate a controlled magnetic field. http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html As I understand, the magnetic field generated depends...
  31. M

    Find the tension in the cable and the force the ramp exerts on the tires

    Homework Statement A 5000 kg car rests on a 32° slanted ramp attached to a trailer. Only a cable running from the trailer to the car prevents the car from rolling off the ramp (the car's transmission is in neutral and its brakes are off). Find the tension in the cable and the force that the...
  32. B

    Why does VFD cable data sheet show Inductance, Capacitance?

    Can someone point me to an understanding of why VFD rated cable include Inductance and Capacitance? For example, Belden cable 29504 shows impedance, inductance, capacitance between conductors, capacitance between conductor and sheild, and DC resistance. Is there a VFD motor calculation that is...
  33. C

    Calculating amount of sag and tension for 1/8 steel cable

    Thanks for reading, hopefully I am posting my first question in the correct area of the forum! I will list as many details as I have in hopes that someone will know how to calculate the amount of sag I will have and tension/force there will be. I am suspending a 1/8 steel cable horizontally...
  34. G

    A cube of side L=2 m is made of a cooper cable with 2mm^2

    Homework Statement A cube of side L=2m is made of a cooper cable with 2mm^2 of cross section area. 1) Find the electric resistance of one side of the cube. 2) Find the equivalent resistance in between the points A and B.
  35. J

    Find the tension in the cable and reactive forces at ground

    Homework Statement A 160-kg utility pole extends 12m above the ground. A horizontal force of 250 N acts at its top and the pole is held in the vertical position by a cable, as shown in the figure (I have attached the photo). 1) draw a free-body diagram for the pole 2) Determine the tension...
  36. M

    How signal is transmitted through RCA cable

    How signal is transmitted through only one wire (red) of simple RCA cable? What is use and how works ground wire (black)?
  37. Imager

    Network Cabling Testing (for home)

    I’m having some remodel work done on a couple rooms in my house. They will be adding a new CAT7 run and replacing the old coax (at least 20 years old). Is there any sort of “hack” I can do to test the speed of the new cables? The only thing I can think of is just moving my laptop around...
  38. X

    Calculate the power loss in electrical cable

    Hi I'm trying to calculate the power loss over an electrical cable. The information of the system is: Maximum current of 20.92 A per unit at 34.5kV The cable has the following properties: DC Resistance at 25 deg C (0.1672 ohms/1000 ft) AC Resistance at 25 deg C (0.1672 ohms/1000ft) The length...
  39. aatari

    Newton's Second law: Tension on Cable

    Hey guys is my solution correct for the question below? 1. Homework Statement Consider a 5.0 kg watermelon that is being accelerated at 2.0 m/s2 [up] by a cable. Find the tension in the cable. Homework Equations Fcable = m.a The Attempt at a Solution Fcable = m.a = 5.0 kg(2.0) = 10N
  40. swotty

    Torque to lift object by cable on a drum accelerating

    Homework Statement An object of mass 1000 kg is lifted by means of a steel lifting cable being wound round a drum of diameter 2.5m mounted on a horizontal shaft. The drum and shaft have a mass of 1000 kg and a radius of gyration of 1.0 m. What is the torque required to give the object an upward...
  41. gilakmesum

    How to charging the handphone without cable

    Please let us know how to make handphone charging use wireless charge?
  42. Nikhil N

    Current transformer for coupling noise into a cable

    I want to couple white noise to a communication cable. I am using a 50/5A CT. My idea is to connect the noise in the secondary and to couple that noise into the cable. I want to know will my idea work? Does the CT what I am using will be suitable?
  43. W

    Solving Cable Balance for T0 and T1

    Mod note: Moved from technical forum, so missing the HW template. Hello everybody and happy new year :partytime: Here is a solution for the following case. Do you agree with ? Thank you in advance for your answer The question is to give the values of T0 T1 and d in terms of g', L and G in...
  44. A

    Waves: fundamental frequency of taut cable

    1. Homework Statement The wire cable supporting the mast of a sailboat has a length of 12 m and a linear mass density of 350 g/m. When pushed sideways at its midpoint with a force of 160 N, the cable deflects by 9.5 cm. What is the frequency of the fundamental mode of vibrations on this...
  45. nothing909

    Cable Sizing: How External Factors Impact Section Area

    Homework Statement How does the method of cable installation and other external factors influence the required cable cross sectional area for a given circuit Homework EquationsThe Attempt at a Solution I've been searching for the answer for this for ages. I only find answer relating to types...
  46. S

    What is the tension in the lift cable and in the string?

    1. Part One: A mass M1 = 30 kg is suspended by a light string from the ceiling of a lift of mass M2 = 300kg. If the lift accelerates upwards at 1 m/s2, what is the tension in the lift cable and in the string? (g=9.8 m/s) Part Two: If the string breaks when subjected to a tension of more than...
  47. K

    Cable car with 2 cable arrangement

    Homework Statement The century-old ascensores in Valparaiso, Chile, are small cable cars that go up and down the steep hillsides. As the figure(Figure 1) shows, one car ascends as the other descends. The cars use a two-cable arrangement to compensate for friction; one cable passing around a...
  48. T

    Statics problem. Cable with distributed load

    Homework Statement can someone please help and explain to me how to do this problem? all the data is in the picture above. Homework Equations i am not entirely sure which equations i should use. i know one possible equation is T=((T_o)^(2)+(wy)^(2))^(1/2) The Attempt at a Solution with the...
  49. K

    Why is the tension in a massive cable always tangent to its portion?

    Homework Statement Why is the tension always tangent to the portion of the cable? The correct situation is on points A and B. Why can't be like on C and D? Homework Equations Newton's force-mass: ##F=ma## The Attempt at a Solution If i move the portion of the cable and examine, for...
  50. G

    Why can a capacitor get discharged through a (long) cable?

    Hi. If a plate capacitor is charged with some charge ##Q##, then there's a voltage ##U=Q/C## between the plates. The electric field between the plates is ##E=U/d##. Voltage is path independent, if I connect the plates with a cable of length ##l\gg d## the voltage across the cable is the same...
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