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.
Dear Readers,
I am trying to build a Schering bridge to measure capacitance change for my research. I need to reduce the cable (line) capacitance to a minimum. I am using an ac 4V (rms), 250 KHz supply.
I tried to use two separate coaxial cables to connect the capacitor plates. The signal...
Homework Statement
A crane consists of a crane arm which is held in place and moved by strong steel cables.
The crane arm is a truss structure, which is a rigid framework of quite thin steel beams welded together, forming many triangles.
The cables are made of steel and they are not one...
Homework Statement
A piece of machinery of weight W is temporarily supported by cables AB, AC, and ADE. Cable ADE is attached to the ring at A, passes over the pulley at D and back through the ring, and is attached to the support at E. Knowing that the tension in cable AB is 300 N, determine...
This question BUGS me
I've tried it a whole lot of times, my teacher explained it to me at least 2 times but he came up with the wrong answer.
I had a couple class mates explain it but it was an Extremely long/condusing way of doing it.
I know the x components are equal so there is no x...
Homework Statement
A uniform cable of weight w hangs vertically downward,supported by an upward force of magnitude w at its top end. What is the tension in the cable (a) at its top end; (b) at its bottom end; (c) at its middle? Your answer to each part must include a free-
body diagram...
how can a single copper cable carry all the different frequencies and prevent them from interfering with each other and destroying data? (I posted this question in the physics forums because it has to do with waves and frequencies)
Homework Statement
If we put a compasd UNDER a cable..
Will that effect on the compass ?
I WANT THE ANSWER AS SOON AS POSSIBLE
Homework Equations
The Attempt at a Solution
Is it possible to design a cable with properties (Capacitance and Inductance) to reduce the number of components needed for the PI filter? I know I can design a cable to have a specific capacitance and specific inductance, but I am not sure if or how i would get these to work with the pi...
Hi All,
I'm trying to come up with a proper method of naming cables in our machine.( we develop vending machines.)
Currently I am using the following structure for cable names:
Host-Target-cable Type
for example: IPC-NAC-D ; which is Industrial PC - Note Acceptor - Data Cable
But...
http://img154.imageshack.us/img154/165/integrallll.jpg
After working it out myself, I have the logarithim part equal to:
[ln b - lna] + [ln c - ln b] = [ln b/a + ln c/b] = ln c/a (Not sure about this statement!)
I don't understand where the c^2 and ab came from with this integral...
Hello,
I am trying to put together a fitness machine that used up to fifteen pulleys. Is there anybody here that is an expert in this field or knows someone who is? I am willing to pay a reasonable consulting fee if they can help solve my problem.
Thank you,
Edmond
Hello,
I have a project for my diploma.And i have some questions. If someone can help me
i would be very pleased.
I have to know what the cables resistance ( σ ( N/mm2)) is,i mean, how big a force, do i need for cut the cable's plastic?I have a disc (it should be the knife), when it turns...
Hi all, I am doing a paper on the space elevator. On the wikipedia site it states that a climber would be far better off on a stationary cable rather than having a cable pulling the climber since "the cable to be significantly wider at the center than the tips". Why does the center have to be...
A 10-m long cable has a "No Hippos in the Pool" sign weighing 25-N suspended from the middle of the cable. The cable stretches by 2.5 cm. What is the strain in the cable?
I know strain is ΔL/L0, but don't really know how that plays out in this scenario. If you could give me the first step or...
Homework Statement
In the pulley-cable system shown, the acceleration of block A, x(double dot), varies with time, t(in seconds), as given by the expression x(double dot) = 2t m/s2. initially the two blocks are 5m apart and both are stationary...
Dear all engineers,
I would like to know the method of calculation the size of the cables, and what the perimeters needed to do this calculation.
also, I would like to know how to get the seqmm cable size if we have AWG cable size And vice versa.
thank you
Homework Statement
Two weights attached to a uniform beam of mass 56 kg are supported in a horizontal position by a pin and cable as shown in the figure.The acceleration of gravity is 9.8 m/s2 .
What is the tension in the cable which supports the beam? Answer in units of kN...
Homework Statement
A 4.2 m long uniform post is suspended by a cable having a tension of 1 700 N.
Homework Equations
What is the mass of this post?
The Attempt at a Solution
I figure there are 2 forces acting in a clockwise direction (the mass of the log on each side of the...
Homework Statement
A uniform 20-kilogram beam is supported in a horizontal position by a pin and cable as shown in the figure. Masses M1 and M2 are suspended from the beam. If M1 = 40 kg and M2 = 20 kg, what is the tension in the cable?
Homework Equations
Unsure
The Attempt at a...
Homework Statement
a mass of 18kg is supported at the end of a horizontal beam hinged to a vertical pole, a cable at 32 degrees with the beam is attached to the pole to support the mass.
Find the force on the cable, beam, and pole.
Homework Equations
f=ma
The Attempt at a...
1. 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. What would the...
Homework Statement
If the maximum tension that a cable can safely withstand is 9000N and the maximum upward acceleration of the elevator is 1.00 ms2, how many 80kg passengers may be safely carried in the elevator?
(The mass of the cable is negligible)
Homework Equations
F=ma
T=mg...
Homework Statement
A steel cable is suspended between 2 fixed points that are 10m apart. A force of 12N pulls down at a point 6 m from the end of the cable (ie: the other part of the cable will be 4m). Find the tension in each section of the cable
Homework Equations
The Attempt...
Homework Statement
Figure 5-60 shows a section of a cable car system. The maximum permissible mass of each car with occupants is 2800kg. 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...
Homework Statement
Our teacher just posted this question online. We have less than an hour to figure it out. Can someone help point me in the right direction.
Your team has devised an orbiting “drop cable”
system that creates an induced EMF by moving a cable through a
magnetic field...
Homework Statement
A 15 meter beam jutting out of the side of a building is held by a hinge (at the wall) and a cable at 10 meters from the wall. The angle between the beam and the cable is 60 degrees and the mass of the beam is 250 kg. If a 1000 N object is located on the beam, 7 meters...
Hello,
My online research has revealed international standards to calculate steady state ampacity of power cables (e.g. IEC 60287), as well as some software programs (Lineamps) and FEA calculations to predict thermal resistance and ampacity of power cables.
My question is how to...
On my mouse cable, there is a blob of plastic which coils the wire once around, I don't know what the material is that encompasses it.
Someone said it was for to stop UHF flashback. What does this mean? I also have it on loads of electrical appliances..
Cheers
Philip
Hi,
I´m looking for a table for stranded steel cable mechanical properties where I could find for a particular diameter of cable (and possibly strand arrangement) which is the corresponding yield strengh.
Or do I necessarily have to go for ASTM A1023 standard to get this data?
Thanks.
Homework Statement
A coaxial cable consists of two long, concentric, perfect conductors. The inner conductor is a right circular cylinder of radius a, while the outer conductor is a thin, hollow annular cylinder of inner radius b.
Suppose a half-infinite length of such a coaxial cable...
Consider a coaxial cable with inner radius a and outer radius b. The potential difference between the inner and outer conducter is V. How can it be shown that the electric field at a distance r from the inner conducter is given by:
E = \frac{V}{r ln\frac{b}{a}}
Any help would be much...
Homework Statement
Hi all.
I have the following expression, which relates the incoming amplitude with the reflected amplitude at a point x = L in a coaxial cable:
A_{\text{reflected}} = \frac{R-Z_0}{R+Z_0}A_{\text{incoming}}.
Here R is the resistance at the point x = L and Z0 is the...
HI
why underground cables take continuous relatively high charging currents, while overhead line take less charging current
Underground cables have a better voltage regulation than overhead lines due to the lower inductance (how) formula please
Homework Statement
The beam is 4.0 m long and has a mass of 14.0 kg. If the beam makes an angle of 41.0 degrees with the wall, what is the tension in the cable?
The attachment is the picture to go along with visualizing the problem.
Homework Equations
sum forces = 0
sum torqes = 0
The...
Homework Statement
An elevator weighing 2.00 X10^5 N is supported by a steel cable. What is the tension in the cable when the elevator is accelerated upward at a rate of 3.00m/s^2? (g=9.81m/s^2)
Homework Equations
I realize this is probably a very simple problem, but neither my textbook...
A shop sign weighing 255 N is supported by a uniform 145 N beam as shown in Fig. 9-54. Find the tension in the guy wire. Find the horizontal and vertical forces exerted by the hinge on the beam.
How do we measure cross-sectional area of a cable (obviously circular)?
For example, diameter of a cable as measured from vernier caliper was 19.5 mm. If we apply A = pi(3.14) r2, answer is 298.49 mm square but tag on said cable is showing Area = 10mm square?
Please explain.
I work for a contractor and we're currently discussing drains on the roof of a building, and whether they should have electric cable heating around them. It gets cold here and snow does accumulate on the roof. Under what circumstances should cables be used and not? Pros / cons?
Homework Statement
Compare sound waves to waves in coaxial cables a.k.a. T.E.M.
I really have no idea how to answer this question. I've been researching and researching, and so far i can't find any information about WAVES for coaxial cables. Any help?
Thanks.
Homework Equations...
Homework Statement
http://smg.photobucket.com/albums/v68/jumpboyb/?action=view¤t=scan0001.jpg"
Pretty much looking for a general equation for capacitance of a coaxial cable per meter length.
given:
-a diagram (click link)
-two radii
-dielectric material
-outer conductor is...
Homework Statement
A train consists of a caboose (1000kg), a passenger car (2000kg), and an engine (2000 kg). If the train has an acceleration of 5.5m/s^2, what is the tension connecting the cable between the passenger and the engine.
a) 27.5kN b) 16.5kN c) 11kN d) 5.5kN e)none of the...
Homework Statement
Ok guys my first ever post so be nice!
Im doing an experiment using a wind tunnel looking at the effects of vortices on cables. Basically the experiment willconsist of 2 vertical cantilever beams supporting a cable between them (So if you like it looks like a portal...
Hi, recent EE graduate, I'm working on a project for myself. I dealt with mostly controls, signals, and digital stuff, and not enough electromagnetics or RF so I am pretty clueless here.
If I were to radiate the full electromagnetic spectrum from dc to visible light onto a copper cable...
Homework Statement
The ramp of a ship has a weight of 200lb and a center of gravity at G. Determine the cable force in CD needed to just start lifting the ramp, (i.e., so that the reaction at B becomes zero.) Also, determine the horizontal and vertical components of force at the hinge at A...
Tension help?
Consider the 59 N weight held by two cables. The left-hand cable is horizontal.
What is the tension in the cable slanted
at an angle of 51◦? Answer in units of N.
What is the tension in the horizontal cable?
Answer in units of N
Homework Statement
A coaxial cable consists of two very long cylindrical tubes, separated by linear insulating material of magnetic susceptibility χm (see Figure). A current I flows down the inner conductor and returns along the outer one, in each case the current distributes itself...
Homework Statement
http://members.shaw.ca/code/statics.bmp
Homework Equations
The Attempt at a Solution
I'm having a tough time getting started with this one. Obviously W= 196.2N and AD = 0.425m
Do I need to do a force-couple system?
Thanks much!
Steven
I have a 45kW VSD drive with pf of .9 and FL amp of 75A, I have a 350m run from the MCC to the VSD itself and I'm trying to calculate what size cable I need so that I don't exceed the specified voltage drop of 3%. The line-line voltage where the motor is to be placed is 400V and the cable...
a large wrecking ball is held in place by two steel cables
http://img378.imageshack.us/img378/3994/yf0543ei1.jpg
if the mass m, of the wrecking ball is 4000kg, what is the tension Tb in the cable that makes an angle 37 degrees with the vertical?
F=T + W = ma
i drew my FBD
i tried...