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. I

    What caused the cable to break during the lifting of a 4500kg container?

    You've been called to investigate an accident in which a cable broke while lifting a 4500kg container. The steel cable is 2.0cm in diameter and has a safety rating of 50,000N. The crane is designed not to exceed speeds of 3.0m/s or accelerations of 1.0m/s^2, and your tests find the crane is...
  2. M

    What is the tension in the cable car's cable?

    The cable cars in San Francisco are pulled along their tracks by an underground steel cable that moves along at 9.5 mph. The cable is driven by large motors at a central power station and extends, via an intricate pulley arrangement, for several miles beneath the city streets. The length of a...
  3. wolram

    Corrosion on the cable fooled my test meter

    Yes i had two today, one was because corrosion on the cable fooled my test meter, the other was because a door swich knob was not in mechanical contact with the switch, two in one day is just not fair, i must be getting sloppy, as i have only had two others in my life ,but then i must...
  4. C

    Unlock the Secrets Behind Cable Channel Encoding

    Does anyone know why on some cable channels I didn't subscribe, I can still see something (with a lot of distortion and noise), while I can't see anything at all in some others? How are the signal modulated and encoded? Are they encrypted? How come some channels are encoded that I can still...
  5. N

    Calculating Tension in the Cable to Hold the Moon

    Q.Suppose the moon were held in its orbit not by gravity but by the tension in a massless cable. You are given that the period of the moon's orbit is T = 27.3 days, the mean distance from the Earth to the moon is R = 3.85 x 108 m, and the mass of the moon is M = 7.35 x 1022 kg...
  6. D

    Pigtail Antenna Cable: Can It Be Substituted With Coaxial?

    Can pigtail cable be substitute with coaxial cable?
  7. A

    Magnetic field of a coaxial cable

    The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, which is surrounded by an outer conductor, which is surrounded by another rubber layer. In a particular application, the current in the inner conductor is 1.86 A out of the page...
  8. E

    Coaxial cable - Signal on oscillosope?

    Hello all, I once wanted to plug two coaxial cables together (tv - antenna), and when I touched the coaxial cable coming from the antenna, I got an electric shock (a weak one, like if you get an electric shock if you are charged and touch metal). My questions: 1) Why did I get an...
  9. B

    Will the Tow Cable Hold During the Car Tow?

    The Problem: Your car breaks down in the middle of nowhere. A tow truck weighing 4000 lbs. comes along and agrees to tow your car, which weighs 2000 lbs., to the nearest town. The driver of the truck attaches his cable to your car at an angle of 20 degrees to horizontal. He tells you that...
  10. M

    Factors Affecting Ribbon Cable Performance

    Can someone give me some examples of factors that affect the performance of ribbon cable please.
  11. B

    Suspension cable exerts no net horizontal force on the towers?

    I've been trying to solve the following statics problem dealing with suspension bridges: Let d1=span length from tower to shore, let d2=mid-bridge span length (tower to tower). The main cable makes an angle of 24 degrees below horizontal to the top of the support tower on the d2 side and 30...
  12. J

    Calculating GPE and Power for a Cable Car Ride

    Hey just gettin a bit stuck on this question...i'll attempt to answer it, but it really doesn't look right to me. A cable car is used to carry people up a mountain. The mass of the car is 2000kg and it carries 80 people, of average mass 60kg. The vertical height traveled is 900m and the...
  13. S

    Cable tension statics problem

    1.) A uniform rod AB is 1.2 m long and weighs 16 N. It is suspended by vertical strings AC and BD. A block P weighing 96 N is attached at E, .3 m from A. The tension in the string BD is? http://img116.exs.cx/img116/2822/STATICS1.jpg I did: (.3m)(96N)+ (.9m)(16N) - (1.2 m)(x) = 0 x=36N...
  14. C

    Find Value of C for Catenary Cable | Trial and Error Method

    Can somebody teach me a better way to solve the equation of catenary cable to find the value of c? If there is no other better alternative, can you tell me how to estimate a value for the trial and error method. Thanks
  15. V

    Elevator problem with safety rails, spring, and a snapping cable->

    Elevator problem with safety rails, spring, and a snapping cable---> The cable of an 1800 kg elevator snaps while it is 3.7 meters above a spring with constant of k = 0.15 MN/m. Also, a safety guide rail device provides a 4.4 kN frictional force against the fall for the duration of the fall...
  16. C

    What is the tension force of each cable?

    Hello everyone. First I would just like to say how thankful I am that there is a forum for physics out here. Also I would like to prematurely thank anyone who is going to help me, it is greatly appreciated. Well I am in ap physics in high school, so this stuff should be cake for you guys...
  17. G

    Find Tension Between Sections of Cable?

    Figure 5-58 shows a section of an airplane cable-car system. The maximum permissible mass of each car with occupants is 3000 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 angle =...
  18. D

    What is the tension in the cable problem.

    An 800-kg car is being towed with a constant speed along a slope. What is the tension in the cable? Neglect all resistive forces. The slope it is on is 20 degrees and the angle that the truck is towing at is 30 degrees.
  19. G

    Calculating horizontal Wire Cable Load

    We've installed a 'zip line' and are trying to figure the maximum load it can safely carry. To date, it has handled, without complaint, 210 lbs. This is fine except over time an overload will obviously weaken the cable - we don't want to do that! The line is a 3/8th inch aircraft cable...
  20. E

    Determining Tension in Uniform Steel Cable

    A uniform steel cable of weight mg is suspended between two equal elevation points. Determine the tension in the cable (a) at its lowest point, and (b) the points of attachment. Judging from the problem, it seems that the tension in (a) and (b) is different. Is this necessarily so? If it is...
  21. P

    Hook Up Two Computers With Cable Modems for One Broadband Account?

    I am wondering if it is possible to hook up 2 computers, with 2 separate cable modems, under the same broadband account. I already have broadband, and want to hook a second computer. I figured an easy way to do this, without running CAT 5 all over the place, and not hassling with wireless...
  22. A

    Cable that holds the elevator got disconnected

    say u r in a elevator, and suddenly the cable that holds the elevator got disconnected and u r falling to the ground while standing,and dropping really fast from 15th floor. you would die right ? this is the question.. just before the elevator crashes on the surface what if you jump ? would...
  23. C

    How much has the cable stretched?

    A truck is pulling a car out of a ditchwith a steel cable that is 9.1 meters long and has a radius of .5cm. When the car just begins to move the tension of the cable is 890N. How much has the cable stretched? converted .5cm to .005m area of the wire A = pie*r^2 Y = 20E10 (steel) used the...
  24. F

    Finding Cable Tension Components with Given Angles

    ive been wrestling with this for an hour and a half, and all I've got it Theta y and Fy. a tree is being supported by cables. the tension in cable AB is 4.2 KN. all it gives me to go on is 2 angles. it 40 deg toward z axis from x axis. and the cable makes an angle of 40 deg with the ground...
  25. wasteofo2

    Man sues cable company becuase his wife's fat, kids lazy, and he smokes/drinks.

    http://www.wisinfo.com/thereporter/news/archive/local_14044768.shtml "Timothy Dumouchel of West Bend wants $5,000 or three computers, and a lifetime supply of free Internet service from Charter Communications to settle what he says will be a small claims suit." "“I believe that the reason...
  26. Juntao

    Calculating Cable Length and Stretch for Uniform Iron Beam in Static Equilibrium

    Picture is attached. The above figure shows a uniform iron beam of mass 254 kg and length L = 3 m. The cable holding the beam in place can take a tension of 1300 N before it breaks. (You may ignore the small mass of the cable in this calculation.) ====== a)What minimum length of the...
  27. M

    Inductance of a triaxial cable

    Hello, I'm a new member of the forum. Are there any good sources of information available that contain (and explain) inductance calculations for various symmetrical (but unconventional) geometries? I'm interested in a triaxial conductor that is similar to a coax in geometric make-up, but...
  28. P

    What is the tension in the cable

    4) A rescue helicopter is lifting a man (weight- 822 N) from a capsized boat by the means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 1.10m/s^2? (b) What is the tension during the remainder of the rescue when he is pulled...
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