how ship anchor works?
104843
That's an interesting question.  Large ships use a navy anchor with pivoting flukes that can sink into the seabed and hold on.  The bow of the ship is specially designed to house the heavy anchor when hoisted.  An anchor windlass lowers the anchor using heavy chain from the chain locker.  The end of the chain is attached (bitted) to the chain locker.  If the windlass fails (poor brakes?) the last link over the side is the bitted end, giving rise to the old saying "the bitter end" which can whip around killing anyone nearby!  After lowering the anchor to the bottom, additional chain must be played out so that the pull on the anchor will be at a gradual angle and the ship will rotate around the anchor in a wide circle, for example if the tide or winds shift.  Therefore, far more chain is needed than the actual depth.  When the anchor is taken in, the ship pulls nearly directly over the anchor and wave action plus the powerful windlass pull it free.\n\nA second popular anchor for use at moorings is the mushroom anchor that is round and curved like cutting a hole out of a large sphere.  The mushroom anchor therefore looks like the top of many common mushrooms.  This anchor settles under the muck and silt on the harbor bottom and forms a vacuum under the anchor when pulled on.  A rubber suction cup works because the atmosphere is pressing on the cup at about 14.7 PSI reguiring a 14.7 pound fource to break the suction of a one square inch cup.  A mushroom anchor resists being pulled up with a force of 14.7 pounds per square inch of area because of the atmospheric pressure plus the weight of the water above the anchor.  The water exerts a force of one atmosphere for every depth of about 34 feet.  Therefore a mushroom anchor at a depth of 34 feet is like a suction cup at two atmospheres or 29.4 pounds per square inch times the area of the anchor.  Often to pull up a mushroom anchoor from the sea, a barge (or large boat) is placed over the anchor and all slack is taken up at low tide.  As the tide comes in it will raise the boat and anchor unless the boat is too small in which case the boat will be dragged under unless cut free!  The anchor may contain hole in its disk to help break suction and to aid in cleaning it with a hose.
423448
Usually they are there to improve the visibility of the wire and grab your attention.  You don't want a tall sailboat going under low wires do you?
192296
This is basically correct.  You will find the "stars" on older brick homes.  There is a rod or rods that run through the house essentially to hold it together.  The star on the outside is a decorative way to hide the end of the rod and to provide the anchor points.
36877
TO make sure there is no BUGS/Glitches in the software its like when u build a boat ... gotta make sure it floats before sending it out to sea
145631
The 'How Stuff Works' website has a really good explanation.  You can find it at http://home.howstuffworks.com/question420.htm
196335
A ship can float on water because the desity of the ship is less than that of the water arround it.  When I speak of the Density, I speak of the ship as a whole.  The materials can be much more dense than water including steel or even Concrete.  What matters is what is in the ship.  If there is mostly air or something light in the ship, the average desity of the ship is very low and the ship will float high in the water.  If there is a lot of heavy cargo, the ship will float low in the water, unless too much cargo is loaded that is too heavy, then the ship could actually sink.\nWhen the ship is sitting on the water, it is displacing a certain amount of water.  The surrounding water then places pressure upon the ship pushing inward and upward.  The ship, not weighing as much as the water that is displaced is held up by this pressure.  If the wieght of the ship becomes more than what is displaced, then the ship will sink.
467716
When you sail, you cut across the wind at an angle. The more you turn into the wind or sheet in the sail, the faster you go. To get back where you started from you 'tack' into the wind at a sharp angle, then turn the other way in a zig-zag pattern. The sail tries to push the boat back but the hull and keel cut into the water so you actually move into the wind
255649
If the mooring buoy has a pad eye or provision for a quick-release shackle hook up, then by all means use it. It was designed for those small crafts.\n\nIf still uncertain that the mooring buoy has a pad-eye provision, and if you have a rope tied to your boat, use the other end and make a lasso-type knot and secure this beneath the mooring buoy. loosen this when you disengage.
142000
ok first off i'd like to point out that the navy uses 3 things that fit into the general category you are talking about\nrope (line)\nSteel cable (wire rope)\nChain (chain)\n\nit depends on what you are using each for.  i'm assuming now that you mean to tie off to the pier?  if not then please note it in the add details section.\n\nok the navy uses lines and sometimes wire rope to tie off to the pier however it is almost exclusively lines.  now if you are asking if one is stronger than the other than it depends on the size and material you are  talking about.  generally here's the breakdown and i'm not going to type in all of the increments cuz i really don't feel like it.\n\nusuallly the navy uses nylon lines as opposed to polypropylene and manila (marline) now a days though they are now trying to switch to kevlar (i'll get to that later)\n\nthese are the break pounds ratings for line vs wire rope\n\n       nylon......wire rope\n1/2"   6400.......18700\n1"     25000......72800\n1 1/2" 53000......160000\n2"     92000......278000\n2 1/2" 140000.....424000\n\nacross the board the wire rope is stronger yes but now look at it this way.  the navy uses 2 1/2" lines to tie off ships to the pier at 140000 lbs the wire rope equivalent would be 1 1/2".  now per 100 feet the line weighs 149 lbs\nthe wire rope weighs 360 lbs  its a matter of being able to handle the lines a 360 lb line is just to bulky and heavy also the mooring operation is very complex and wire rope kinks and twists in ways that tend to make it not easy to handle.  thats just for beginners now you have getting underway.  if pearl harbor happened again you think you're going to want to mess with 360 lbs of wire rope in a big tanged mess in order to get underway.  NO  you cut the lines loose.  then you have the issue of lines doing what is known as PARTING.  this is where the line (line here meaning MOORING LINE be it line or rope) breaks.  with nylon line you can install what is known as a tattle tale.  it is a smaller piece of line that is spliced into the line as the line stretches (and it WILL) if it is going to part.  the tattletail's will pop first giving warning to relax the line quickly or get the hell out the way.  when a nylon line parts it whips back like a rubberband at faster than the speed of sound it WILL KILL PEOPLE if they are in the WRONG place at the WRONG TIME.  now a rope whan it parts.  first you won't know it's coming cus there is very little stretch to a rope so no tattletail. second if you tried to put in a tattletail it would weaken the rope. now here's the kicker when a rope parts.  it not only snaps back but it also becomes in escence a shrapnel grenade.  there is no right or wrong place to be when a rope parts. IT WILL GET YOU.  and if it doesn't kill you.  you AIN'T GONNA BE HAPPY! remember i mensioned KEVLAR Lines?\n\nthe navy is switching to them cuz A: they weigh about the same as the Nylon does B: they are stronger C: you can put a tattletail in them without weakening them and D: when they part they simply drop down into the water. they don't snap back and kill people.  this is of course just the basics i'm not mensioning the myriad other reasons like chemical exposure rust etc etc...
1005012
Maybe it has something to do with grounding. If a ship is in the ocean and not touch anything then there is no reason for the current to go up right?
552666
For a simple answer look up how a plane propeller works.
241884
There are maritime stabilizers that “stabilize” a ship to dampen it’s natural tossing on rough seas.\n\nThere are aviation stabilizers, such as the horizontal stabilizer that is part of the tail empenage that controls the vertical axis of the airplane in conventional flight.\n\nThere are chemical stabilizers that “stabilize” a substance, preventing it from changing composition, such as the commonly used “STABIL” that is placed in gasoline fuel tanks to prevent the fuel from decomposing.\n\nJohnny
34167
Ur... I thought the question was HOW, not "WHY":\n\nYou draw arrows for each force.  They start from a point, an go in the direction of the force.  You draw them to scale so they are proptionately long for the different forces.\n\nSay you have a boat doing 20 mph due west, against a current 10 mph due north.  Where will the boat end up in 1 hour?\n\nScale:  1" = 10 mph\n\nDraw a line to the left (West) 2" for 20 mph\nDraw a line up from the same starting point, 1".\n\nTo find the end point, draw paralleles so that it makes  four-sided figure.  A line draw from you origin to the point across the diagram will tell you  the resultant force (from length of the line) and the bearing or direction it will go.\n\n(Its easier when you draw it, believe me)
684710
A piece of iron has a density greater than water. Thus it will sink when the weight of the volume of water displaced by the piece of iron is less than the weight of the piece of iron. If iron is shaped, or used to make a ship,  the iron ship will float if the total volume of water displaced by the part of the ship in the water weighs more than the total weight of the iron used to make the iron ship. Thus, the upward force of buoyancy is greater than, or equal to,the downward force of gravity and the ship stays afloat.\n\nThis is called Archimedes's principle of buoyancy and it is fundamental to the design of all ships and heated air balloons.TWH
80144
Center of gravity of the displaced liquid is the center of bouyancy. The (resultant) weight of the vessel acts at the center of gravity(downwards) and the (resultant) bouyant force acts at the center of bouyancy upwards.\n\nIt is better to have the center of gravity lower than the center of boyancy. for stabality. The lower it is the more stable.\n\nThis is because, if the vessel is tilted, the weight and the bouyant force make a couple. This can be against the tilt or with the tilt. If center of bouyancy is lower than center of gravity, it will tilt more. And vice versa.\n\n YOu can find this out by drawing small diagram of the forces.\n\nAlso you can try this. \nTake a pencil. \nhold it vertical but little tilted. \nnow assume, the bottom end is center of bouyancy and top end is center of gravity.\n\nso, push up form the bottom and push down form the top. You will see that the pencil becomes horizontal. i.e you ship sinks.\n\nIf you assume the opposite - take the top to be the center of bouyancy. Pull the top up and the bottom down. The pencil straightens. YOur ship stabalises.
1133022
It theoreticaly should not be too dificult to solve using vectors.  I am not going to solve it because I would prefer having exact values to work with, but basicaly, what you would need to do is find the complete distance, also make a graph where you find the time intersect of the torpedo and boat, and work with the x/y components to figure out what would be the ideal inclination.  It is a complex problem where you must work with more than one vector system, but it is doable if you work in parts.
1171048
The magnetic field around there from a large area of material under the sea bed creates a magnetic and electro-magnetic field so strong that as a plane the navigation system would warp as if the plane was hit by thunder. Losing the navigation makes it crash into the sea bed and smash up on the under sea surface.\nThe ships would lose navigation and the ship would be stuck in the water until a storm comes along. This storm would swipe through the water and reach the ship and quite literaly sink it. The magnetic field shifts in that area like a sunspot would on the sun and imagine this area is a Earthspot rather than a sunspot.\nThe US government hide the truth as it would block the transportation and financial movement around the shipping and transport area. Also effecting the Bermuda islands.