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. R

    Finding a 1.5 GHz Line Amplifier for RG59 Coaxial Cable Loss

    Hello. I 'm looking for a line amplifier schematics working around 1.5 GHz to compensate coaxial ( RG59/CU) loss behind a L.N.A
  2. P

    Power cable heat rise calculations

    We have a 90 deg C. rated PEX cable copper sized 1x185mmm2. This cable is to be used in 45 deg C environment (alone in air on a cable tray). We want to use it in intermittent operation where the cable will be loaded with 600 kW for 40 seconds, then nothing for 40 seconds. Then repeat. The...
  3. K

    Cable rotations formulae or method

    Hello, and thank you for your time. I observed a wire vibrating is good at blocking things trying to pass through their area. for example a rope spinning around can stop a tennis ball thrown through that area. obviously the speed of the rope allows it to "protect" an larger area than its gauge...
  4. A

    Tension in landing cable on an aircraft carrier

    Homework Statement [/B] Keep in mind this is a Top Gun-themed homework assignment. Cougar comes in for a shaky landing. His 20422 kg airplane traveling at 85 m/s strikes the deck at 3.5 degrees below the horizontal. Cougar's plane snags the landing cable stretched across the deck. The landing...
  5. R

    MRI Electromagnet Interference in a Figure-8 cable

    The prevailing wisdom is that coiling excess signal cable under an MRI magnet for storage in a figure-8 configuration will reduce or eliminate induced noise onto the cable from the pulsing fields from gradient coils. I am starting to doubt this, however. A quick diagram of a figure-8 looped...
  6. Valerie Prowse

    Equilibrium problem - Vertical beam, cable

    Homework Statement A uniform vertical beam of mass 40 kg is acted on by a horizontal force of 520 N at its top and is held, in the vertical position, by a cable as shown. a. Draw a free-body diagram for the beam, clearly labeling all of the forces acting on it. b. Calculate the tension in the...
  7. M

    What is the tension in the right cable?

    Homework Statement 2 cables are used to support a 24kg mass on a 1.6m long, 8kg uniform horizontal beam. The 24kg mass is 0.6m from the right cable. What is the tension in the right cable? Homework Equations torque = rFsinx The Attempt at a Solution Fy = ma = 24(9.8) = 235.2N Fx = ...
  8. T

    Engineering, Statics -- A pulley is free to move on the cable

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  9. Y

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  10. J

    Maximum impact force that a cable can withstand

    Homework Statement " A 1100 kg lift is suspended by a series of 24 steel cables of mean diameter 20mm. The cables are attached to the lift top and are arranged so that torsional vibration is minimised.If the cable is manufactured from steel with an elastic modulii of 185GN/m2 and elastic...
  11. M

    Calculating Power Loss in Transmission Cables

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  12. terryds

    Understanding Normal Force Direction in Leaning Ladder & Cable Beam Systems

    I know that normal force is a reaction force. http://www.sumoware.com/images/temp/xzhhpaacgkdktjna.png In the leaning ladder problem, the normal force is perpendicular to the floor and the wall. But, in the cable and beam problem, why isn't the normal force perpendicular to the wall ...
  13. H

    Experimental Design - Measuring Force Vector on Cable

    Hi All, I'm trying to design an experiment for measuring force along a cable. The cable is will be held in a persons hand and the other end will be fixed to a transducer to measure the force of tension. In order to account for the multiple force vectors, I thought of using a gimbal table or...
  14. T

    HNC Dynamics help please -- Hoist cable looped over a winding drum

    Hi guys I am looking for help with some formulas, its for hnc mech eng, the question is as follows a winding drum with moment of inertia 24 kg m2 and a winding radius of 0.6m is used to accelerate a loaded hoist with mass of 850kg at a rate of 0.8ms by means of a cable, frictional resistance can...
  15. S

    Torque Help -- Tension in a Hoist Cable

    Hi, I'm having a problem with 3. (b) (ii) here. I know that the frictional torque is 1500Nm and that from (b)(i) being 5055N I assume this is multiplied by 1.5M (drum shaft radius) which gives me 7582.5N. Do I have to calculate the angular acceleration of the drum from here, which could then...
  16. Adrian B

    Battery for power -- cable modem and wifi router during outage

    Let me start by saying that the point of this question is to figure out if I can do this with items on hand instead of buying a UPS. I have a cable modem and wireless router which require 12V 750mA and 12V 1000mA respectively. In the event of a power outage, I'd like to be able to manually...
  17. 1

    Electric Field and Potential Difference in a Coaxial Cable

    Homework Statement : [/B] Co-axial cable, relative permittivity, capacitance, internal energy A long straight co-axial cable of length 1 consists of an inner conductor of radius r1 and a thin outer conductor or radius r2. The dielectric between the conductors has a relative permittivity εr...
  18. D

    Work done by the tension on a cable

    Homework Statement A crane lifts a 1250 kg load directly upward with a constant speed through a vertical distance of 8 m. How much work is done by the tension in the crane cable? Homework Equations Im thinking its the work equation but this is were i got stuck W = m(as)The Attempt at a...
  19. L

    What are the different types of capacitance in a system of conductors and Earth?

    Anybody please help to tell me if there's a book or journal that clearly describe the definition and differences ( best if it comes with illustration or diagram) between these engineering terms: (1)partial capacitance (2)mutual capacitance (3)self capacitance (4)earth capacitance Thank you!
  20. arpon

    Find the Tension and Acceleration of Cable B in Picture 3

    [moderator's note: moved to homework forum so no template] In picture 3, A has touched the ground, so it has stopped. But B has a velocity upward. So in this situation, the cable is not straight. What will be the tension of the cable and what will be the accelertion of B in picture 3 ...
  21. arpon

    Tensions of cable over a pulley

    [moderator's note: moved to homework forum so no template] This is a frictionless ideal pulley. Are T_1, T_2, T_3 equal? If so, why? Please explain in details?
  22. N

    Magnetic field for coaxial cable

    Homework Statement https://scontent-b.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/10846336_1517298108546407_4211362504714893270_n.jpg?oh=2f11c165933554a0e4003b398c877004&oe=5542789C Homework Equations ∫B⋅nda = Iencμo Ienc=∫J⋅da The Attempt at a Solution For r < a: Ienc = I...
  23. S

    Solving Tension in Cable Homework Statement

    Homework Statement A vendor hangs an 8.6kg sign in front of his shop with a cable held away from the building by a lightweight pole. The pole is free to pivot about the end where it touches the wall, Homework Equations T*L*sinΘ = mgd where d is the distance from the sign to the wall and L...
  24. P

    What causes the magnetic field inside a coaxial cable?

    Hi. In this task we're asked to calculate the magnetic field inside the small cylinder (0>r>r1). The answer is zero, which I don't quite understand...Here is the picture: http://bildr.no/image/WTJ1VG5F.jpeg As the picture shows there's a current I going through the inner cylinder. Wouldn't this...
  25. B

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    Homework Statement Find approximate expressions for T1 and T2 that are valid when h/d << 1 and h/x << 1 Homework Equations T_{1} =\dfrac{mg\left(d-x\right)}{dh}\sqrt{1+\dfrac{x^{2}}{h^{2}}} T_{2} =\dfrac{mgx}{d}\sqrt{1+\dfrac{\left(d-x\right)^{2}}{h^{2}}} h^{2}...
  26. C

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  27. S

    Pin and cable supported by a beam

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  28. J

    Solving Mystery Electrical Cables: Seeking Advice

    Hello all. I am not an electrical expert here, just know enough to wire basic things at home (i.e. switches, outlets, etc)...so please be kind. My situation is this. We recently bought a new house and have found a couple of mysteries. The biggest one is that there are several electrical...
  29. H

    What is the tension in each cable holding up a 100kg Halloween decoration?

    Homework Statement A huge Halloween decoration of mass 100kg is suspended by 3 cables. Each cable is exactly 25m long and is attached to each of the three building equidistant from each other. Each cable makes an angle of 30 degrees with the side of the building to which it is attached. What is...
  30. S

    Mass in Equilibrium with Variable Length Cable

    Homework Statement Consider the diagram below. A 1000 kg block being suspended in equilibrium by cables c and a. Cable c is on a pulley which can vary the length of the cable. Write the constraints of equilibrium. Find the tension in each cable based on varying lengths of cable c between 1.2 m...
  31. M

    Having a doubt in breaker and cable selection

    hello i have got a 150A breakerMCCB and the cable connected is 95sqmm and load current is 135A is this correct or any changes is to be made? what will happen if the supply is given from 420v 3phase system
  32. vead

    How can I burn hex code to p89v51rd2 without a usb to rs232 serial cable?

    hello , I want to burn hex code from Laptop to p89v51rd2. but I don't have usb to rs232 serial cable laptop -aspire746 os- window 7 serial port microcontroller nxp89v51rd2 compiler - keil programer software - flesh magic com port 1 baud rate 9600 interface - none ISP max RS232IC...
  33. X

    Catenary shape of a towed underwater cable

    Hello, I'm designing a towed underwater vehicle (towfish) and I am having trouble with determining cable tension at the length of the cable at given depths and speeds. I have estimates of vehicle drag at speeds up to 4 m/s and the vehicle weight in water is known. Its really just the...
  34. D

    Help with voltage losses in cable question

    the 400kV circuit is then stepped down onto a 132kV circuit (Ratio 3:1) and is used to feed a 50km, 2 wire (Ostrich) cable circuit, calculate voltage loss in the cable run. and this a table that went with the question http://gyazo.com/a47c72d45a149cffa9d781ace8a2008d and the first question...
  35. J

    Static Equilibrium with a beam and cable

    Homework Statement A uniform vertical beam of mass 40kg is acted on by a horizontal force of 520N at its top and is held, in the vertical position, by a cable as shown in the attached picture. a) Calculate the tension in the cable b) Determine the reaction forces acting on the beam by the...
  36. B

    Resonant frequency of a coaxial cable

    What is the equation (and derivation of equation) to work out the resonant frequency of a coaxial cable? Given that the cable has a resistance, capacitance and inductance per meter which are known. Links and explanations are much appreciated Thanks :smile:
  37. Curieuse

    Cable car system : Tension in the pull cable

    Homework Statement Figure shows a section of a cable car system. The maximum permissible mass of each car with occupants is 2800 kg. The cars, riding on a support cable are pulled by a second cable attached to the support tower on each car. Assume that the cables are taut and inclined at θ=...
  38. T

    Power transported down a coaxial cable

    Homework Statement A long coaxial cable carries current I. The current flows down the surface of the inner cylinder (of radius a) and back along the outer cylinder (of radius b). Calculate the power transported down the wire. Homework Equations The Poynting vector is given by...
  39. C

    How Do You Calculate Tension in a Cable and Force on a Hinge?

    Homework Statement A 20 kg uniform beam 10m long is attached to a wall with a cable. The cable is attached to the middle of the beam at 90º to the beam. A box of mass 50 kg is suspended from the beam as shown. Determine the tension in the cable. Determine the force acting on the hinge at...
  40. R

    Potential Difference between conductors for a coaxial cable, conflict

    conflicting results. find the potential between the two conductors of a coaxial cable I have already found E... E = lambda / 2 pi r epsilon my question: What are the integration limits for finding the potential between the conductors? say we have a radius a (inner conductor)...
  41. Y

    Insulation Resistance in a coaxial cable of length L

    Homework Statement Determine the insulation resistance in a coaxial cable of length L, with conductivity, as shown in Figure assume that the current density J is radial direction. The Attempt at a Solution so i was wondering if this approach is correct, consider a sequence of...
  42. BrainMan

    Objects in equilibrium hinged platform with cable problem

    Homework Statement A hinged platform flagpole weighing 500 Newtons is supported in the horizontal position by a cable as shown in figure 4.35. Find the tension in the cable and the horizontal and vertical forces at the hinge. Angle ø = 30°Homework Equations ∑F=0 ∑T=0 T= F* the lever armThe...
  43. R

    Space elevator problem: how long is the cable?

    Homework Statement "Consider a cable, of fixed mass per unit length, which extends radially from just above the surface to a distance ηR measured radially from the center of the Earth. By determining the total force on the cable, or otherwise, find an expression and numerical value for η. At...
  44. MarkFL

    MHB Minimize Total Length of Cables: Estimate Minimum Value?

    Here is the question: I have posted a link there to this thread so the OP can view my work.
  45. J

    Tension in a catenary curve - Cable Camera

    Hi, my problem is this; I am designing a cable camera system to film downhill pursuits. I need to calculate how much tension is required to hang a cable over a 100m span with no more that 0.5m sag in the middle, when is it fixed at two point, both at the same hight. From the research I have done...
  46. K

    What Is the Electric Field of a Coaxial Cable?

    Homework Statement A long coaxial cable of length L consists of a cylindrical metal sheath of radius b surrounding a conducting wire with outer radius a. The sheath and wire are given the same charge per length +Q/L. Find the electric field in terms of distance r from the central axis of the...
  47. V

    What Is the Stretch of a Cable Under Load?

    Homework Statement A 1.25m diameter wrecking ball hangs motionless from a 1.75 cm diameter cable. The wrecking ball is solid and is constructed of steel (density = 7800 kg/m3). If the cable is 16 m long, how much does the cable stretch? For the cable use E = 175 GPa.Homework Equations δ=(FL/AE)...
  48. M

    Compute the distance x and tension of each cable

    Homework Statement The thin steel plate, weighing 82lb/ft^2, is being lifted slowly by the cables AC and BC. Compute the distance x and find the corresponding tension in each of the cables. [See attachments for Figure] Homework Equations Summation of X = 0 Summation of Y = 0 Moment=Rd...
  49. P

    What Causes the Velocity of a Cable Car to Change in the Rain?

    Hi, Homework Statement A cable car slides without any friction along a horizontal wire with initial velocity v0. The car is half filled with water and its mass (with the water) is m. At t=0 it starts raining (perpendicular to the ground). The rate at which water is collected in the car is k...
  50. X

    Length of coaxial cable, based on signal reflection

    Homework Statement We measured the time between a signal source, and it's reflection coming back through our probe after going through an open-ended coaxial cable. My teacher told us this: the cable has a polyethylene insulator between central wire and the grounding web, which has a...
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