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. M

    Coaxial cable; current problem

    Homework Statement Type P241B coaxial cable has an inductance of 0.4 μH/m and a capacitance of 40 pF/m. The diagram below shows a 100 m length of this cable connected to a battery and switch at the sending end and a 50Ω resistor at the receiving end. (a) If S is closed, what initial current...
  2. H

    What is the tension in the cable?

    Homework Statement Problem's pic: http://i92.photobucket.com/albums/l18/bonbons06/steelBeam01.png Steel construction beams, with an industry designation of W12 × 22, have a weight of 22 lb per foot. A new business in town has hired you to place its sign on a 4.0 m long steel beam of this...
  3. S

    Finding the Electric Field in a Coaxial Cable with Volumetric Charge Density

    Homework Statement Consider a coaxial cable that consists of inner/outer conductors of radii a and b, and it is filled with electron cloud with volumetric charge density of ρv = Υ/ρ [C/m3] for a < ρ < b. If outer conductor is +Vo [V] more positive than inner conductor, find E field between...
  4. W

    The first transatlantic telegraph cable

    I think it's amazing that by 1860s the industrial revolution was advanced enough to make huge commercial projects possible: http://en.wikipedia.org/wiki/Telegraphy That was 150 years ago.
  5. S

    Polarization of Coaxial Cable with Compound Dielectric

    Homework Statement A coaxial cable of circular cross section has a compound dielectric. The inner conductor has an outside radius a , which is surrounded by a dielectric sheath of dielectric constant K_1 and of outer radius b . Next comes another dielectric sheath of dielectric constant...
  6. D

    Work lifting cable and work pumping water

    so i know that when there is a cable hanging from say a building that is taller than the length of the cable and you want to find the work done lifting half of the cable, you have to split the integral up since each "small piece" of rope in the first half gets lifted up a variable amount while...
  7. J

    The influence of crossing angle on amplitude in cable to cable coupling

    Homework Statement Hi all, I have this project i have to write but i am having trouble getting the necessary materials to aid my writing. The project topic is the influence of crossing angle on amplitude in cable to cable coupling. It is a magnetic coupling problem and i am supposed to design...
  8. A

    How Do You Calculate Tension in a Cable Connected to Springs?

    Homework Statement http://img163.imageshack.us/img163/7491/staticsk.jpg Those weird squiqqles are supposed to represent springs. Not exactly an artist :D Homework Equations F = kx The Attempt at a Solution After drawing a fbd and breaking the tension into x and y components...
  9. D

    Critical angle inside cable

    A fiber optic (n = 1.5) is submerged in water (n = 1.33). What is the critical angle for light to stay inside the cable? i am so confuzed. this is the final question of my paper and i am stuck on a couple questions before this so it is obvious i would get this. i just need a start please.
  10. N

    Calculate the capacitance per unit length of the cable

    Homework Statement The coaxial cable from a television or other device has an inner conductor with diameter of 1 mm and the shield of diameter 5 mm. Assume a plausible value for the dielectric constant (3 ≤ κ ≤ 5) of the dielectric separating the two conductors and calculate the capacitance...
  11. M

    What is the tension in the cable of a descending cable car with a counterweight?

    Homework Statement The 2020 kg cable car shown in the figure descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1850 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are...
  12. L

    Fibre Optic cable vs Copper wire

    Is the fibre optic cable cheaper than copper wire for transmission? I believe there is still loses in a fibre optic cable. As the critical angle of glass is 42 degrees, thus about 50% of the signal would be lost. Is that true?
  13. G

    String waves on a cable car and free falling.

    Homework Statement You're riding a cable car from Bogota up to Monser- rate. During your ride there is a small earthquake that sends vertical, transverse waves propagating along the cable. The cable's tension is T, its linear mass den- sity is u, and the wavelength of the wave is...
  14. R

    What is the Attempt at a Solution?

    Homework Statement If the outer conductor of a coaxial cable has radius 3.5 , what should be the radius of the inner conductor so that the inductance per unit length does not exceed 55 per meter? Homework Equations The Attempt at a Solution 1.385
  15. M

    Cable Pulling a Car: Drawing FBD

    Homework Statement A 1010 kg car is held in place by a light cable on a very smooth (frictionless) ramp, as shown in the figure . The cable makes an angle of 31.0 degrees above the surface of the ramp, and the ramp itself rises at 25.0 degrees above the horizontal. Draw a free-body...
  16. T

    Calculating Work and Speed of Elevator with Broken Cable

    Homework Statement An elevator cable breaks when a 798 kg elevator is 28.9 m above a huge spring (k = 8.00 multiplied by 104 N/m) at the bottom of the shaft. (a) Calculate the work done by gravity on the elevator before it hits the spring. I got 226009 which is right (b) Calculate...
  17. M

    Shuttle, cable and satellite

    A satellite was connected to the shuttle by a long, conducting cable, the satellite being in the higher orbit. As the shuttle orbited through the Earth’s magnetic field, an e.m.f. was induced in the conducting cable. The shuttle, cable and satellite were all moving through the ionosphere...
  18. K

    Support reaction on pulley due to cable. Help needed

    Hi and greetings from new member. A problem brought me to these forums and i am hoping someone will be able to explain what is going on here. I am working on this project, for which i need to design a truss/frame to support a load. So i came up with this design (diagram attached)...
  19. Loren Booda

    Can cable companies determine viewership?

    Is it possible for TV cable companies to count the households tuned into, say, the Super Bowl or particular commercials?
  20. A

    Cable theory - calculating cable length using graphs

    Homework Statement Using a simulation program I must determine cable length (lambda), area specific conductance (Gm) and internal resistivity of a cell. The program allows you to inject a current (in uA) and change the electrode distance from the centre of the cell. The simulator...
  21. Y

    Calculating Tension on 500kg Beam Supported by Cable

    Homework Statement A 500 kg beam is free to pivot about its lower end and is supported by a horizontal cable at its upper end, as shown in the figure. (figure has angle 35 degrees between beam and the wall) Assuming the mass of the beam is uniformly distributed, what is the tension in...
  22. N

    Refraction and fiber optic cable diameter

    Hello there, I'm wondering if there is any restricting reason why fiber optic cables are not made thicker. Regardless of the practical applications, is there any reason you can't make a fiber optic cable that is only 2m long but 2cm thick (compared to the normal 0.0125 cm thick)? Does width of...
  23. N

    What is the relationship between the length and height of a cable?

    Hi, everybody, I really hope you can help me out with this one. I work for an outdoor facility, and we were just replacing our zip cable. Due to major safty issues, we need to get it at the exact height it used to be at, and that's kind of tough. After a few trial-error sessions, we...
  24. R

    Find the tension in the cable linking the two carts.

    Homework Statement Two 1kg carts and a 500g weight are linked with cables. One of the carts sits on a 15° ramp, while the other is on a horizontal surface. See diagram. Find the tension in the cable linking the two carts. i attached the picture. Homework Equations im not sure, but i think...
  25. S

    How does a superconductivity cable achieve zero resistance?

    Well. I have the image of the question. http://img99.imageshack.us/img99/6834/question5.png Question b)ii). I know that the total resistance of the cable is 0 even though the copper itself still has resistance. I just want to know how the combination of the Superconducting filaments...
  26. L

    How Much Tension Holds a Snowboarder Airlifted by a Helicopter?

    an 1800kg helicopter with a cable and harness is rescuing an injured snowboarder. the harness and snowboarder have a mass of 78.0kg what is the tension in the cable when the snowboarder is being flown to safety at constant velocity while hanging in the harness? I am completely lost on this...
  27. A

    Finding Tension and Forces in a Cable-Supported Sign System

    Homework Statement A sign is supported by a uniform horizontal boom of length 3.00 m and weight 80.0 N. A cable, inclined at an angle of 35 with the boom, is attached at a distance of 2.38 m from the hinge in the wall (see figure below). The weight of the sign is 120 N. What is the tension...
  28. H

    Elevator Cable Forces question

    Homework Statement A block, mass m, slides down a frictionless incline making an angle theta with an elevator floor. Find its acceleration relative to the incline when: a) elevator descends at a constant speed b) elevator ascends at a constant speed c) elevator descends with a constant...
  29. D

    Finding tension of a cable on a beam

    I am unsure of how to go about this problem, because whatever I tried wasn't right. So if anyone could help me by going step by step through it, showing all equations and numbers used, and then showing me the answers so I can make sure I get the same thing, I would appreciate it. A uniform...
  30. T

    Finding the tension in the cable

    Homework Statement A ski gondola is connected to the top of a hill by a steel cable of length 580 m and diameter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 19 s for the pulse to travel the...
  31. T

    Calculating Force and Direction of Cable AB

    Homework Statement cable AB is 13m long , and the tension in that cable is 3900N Determine (a) the X,Y and Z components of the Force exerted by cable on the anchor B (B)The angles alpha,beta and gamma defining the direction of the Force http://www14.0zz0.com/2009/11/06/12/666835222.jpg...
  32. R

    Work Question involving Cheese, an elevator, and a cable

    Homework Statement •••23 In Figure 7-34, a 0.250 kg block of cheese lies on the floor of a 900 kg elevator cab that is being pulled upward by a cable through distance d1 = 2.40 m and then through distance d2 = 10.5 m. (a) Through d1, if the normal force on the block from the floor has...
  33. R

    Equilibrium angle and cable tension between collars

    Homework Statement There are two collars hanging on a vertical frame made up of two smooth rods (see attached for figure). If the mass of collar A is 8 kg and the mass of collar B is 4 kg, determine the equilibrium angle \alpha and the tension in the cable between the collars. Homework...
  34. A

    Finding Cable Tension in Elevator w/ Initial Velocity

    Homework Statement An elevator with a small initial upward velocity being raised by a cable. The tension in the cable is constant. Find the magnitude of the tension in the cable. Be certain that the method you are using will be accurate to two significant figures. Acceleration=10 m/s^2...
  35. G

    Cable Tensions at points, help.

    Homework Statement Compute the cable tension at the midpoint, (L/2), the quarterpoint (L/4), and support for a 1600 foot span with a sag at the midpoint of 100 feet, when the cable is loaded with 10 kips/foot spread uniformly along the horizontal line. Homework Equations The...
  36. K

    What is the tension on the elevator cable?

    Homework Statement An empty elevator of mass 2.7x10 (3) kg is pulled upward by a cable at an acceleration of 1.2 m/s (2) a) What is the tension in the cable? b) What would be the tension in the cable if it was accelerating downward at 1.2 m/s (2)? c) What would be the tension in the...
  37. D

    Calculate Force AB & Angle Support System

    Hi, I been trying to do this exercise, visually it looks very basic but I just need some guidance, thanks in advance :).Homework Statement Calculate the Force AB in Cable and the angle(theta symbol) for support system shown. Point A pinned and Point B connected as a cable at an angle( not...
  38. M

    How Do You Calculate Cable Tension in a Balancing System?

    Homework Statement hello i have a problem with this question. the cylinder shown in fig1 has a mass of 10 kg. if theta = 45 and the system is in eqlibrium determain the tension in cables ca, cb. Homework Equations all i want is the equations and a guide to the i.e what each...
  39. S

    Solving Cable Tension and Moment Magnitude Problem

    Homework Statement...
  40. C

    Thermal Conductivity in a Copper Cable

    Hi all I'd like to heat up a mile of buried copper cable to roughly 100 deg C. The centre core is 80mm dia solid copper with impregnated paper insulation. Maximum spot temp is 150 deg C. I can expose the core at each end and clamp on a heating element. I've got plenty of time =...
  41. N

    Space Elevator Vehicle: Acceleration After Cable Release

    Say you have a space elevator 47000 km* long (well past the point where centripetal acceleration cancels out gravity) There is a vehicle traveling up the cable with a pretty high velocity, and instead of braking it just shoots off the top. (assume the counter weight allows this) At the...
  42. M

    How can we calculate the current (I) if we have cable with 25 mm size for 480V?

    dear engineer, how can we calculate the current (I) if we have cable with 25 mm size for 480V? and are there any other parameters we should know to calculate the current. (for plant project purpose)
  43. M

    Simple quesiton involving Tension of a cable supporting a beam

    Homework Statement Determine the tension in the cord if the weight is 90kg The Attempt at a Solution The tension is the same throughout the rope apparently so; ∑Ma=0 = T(2) - (4/5)T(4) - 882.9N(5.5) T= 933.383N... would that be the force in the cable then? i don't have to worry...
  44. P

    Energy stored in a cable? (A Level CW)

    Energy stored in a cable?? (A Level CW) Why is the energy stored in a steel cable used for towing gliders so small? And is there an equation that could show this?
  45. D

    Elevator cable Tension problem

    Homework Statement An elevator cable can stand a maximum tension of 19000N before breaking. The elevator has a mass of 520 kg, and a maximum acceleration of 2.16 m/s^2. Engineering safety standards require that the cable tension never exceed two-thirds of the breaking tension. How many 65-kg...
  46. J

    Dermining moments caused in tension of cable

    Determine the moment created about the support leg at "A" caused by the tension in the cable of 12.3kN. (see attachment for diagram)
  47. T

    Solving for Tension in Elevator Cable: 2300 kg, 50 m, 12 m/s

    Homework Statement An elevator and its load have a combined mass of 2300 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 12 m/s, is brought to rest with constant acceleration in a distance of 50 m. Homework Equations The Attempt at a...
  48. B

    Charge inside and outside coaxial cable

    I'm attempting to teach myself some electrostatics, so that I'll be prepared when I head back to school full time. Homework Statement Determine the electric field inside the inner conductor, between the conductors, and outside the conductors of a coaxial cable when the inner conductor is...
  49. N

    Cable to be used for the suspension bridge

    Homework Statement The cable to be used for the suspension bridge can safely support a tension of 40 MN.  Calculate the shortest length of the cable that can be used to construct the bridge.  Calculate the corresponding value of h. (Neglect the issue of safety factor). L = 72...
  50. 0

    Can anyone tell me what triax cable is good for.

    Can anyone tell me what triax cable is good for. As far as I understand it, it is unbalanced so you cannot use it for differential transmission, and I don't understand how there is supposed to be a difference between single and double shielding.
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