What is Ship: Definition and 247 Discussions

A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying goods or passengers, or in support of specialized missions, such as defense, research, and fishing. Ships are generally distinguished from boats, based on size, shape, load capacity, and tradition. In the Age of Sail a "ship" was a sailing vessel defined by its sail plan of at least three square rigged masts and a full bowsprit.
Ships have supported exploration, trade, warfare, migration, colonization, and science. After the 15th century, new crops that had come from and to the Americas via the European seafarers significantly contributed to the world population growth. Ship transport is responsible for the largest portion of world commerce.
As of 2016, there were more than 49,000 merchant ships, totaling almost 1.8 billion dead weight tons. Of these 28% were oil tankers, 43% were bulk carriers, and 13% were container ships.

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  1. M

    Tracking a Space Ship: Will an Asteroid Hit the Target?

    This problem is a sample flight path of a ship in space. Its path is described by the line r(t) = (-1+t)i + (2-t)j An asteroid has the starting point (0, 5, -1) and a heading vector of 2i + j + 3k Ship x = -1 + t j = 2 -t z = 0 asteroid x = 0 + 2t y = 5 + t z = -1 + 3t The...
  2. S

    Propeller of a ship - construction

    Hi guys I am into construction things, I have learned to construct many things now i am into propellers so can anyone tell me how to construct/ design a simple basic working propeller. How to construct the blades, at what angle, pitch thickness, etc etc... any e-book or site where i can i find...
  3. S

    Space ship traveling time from tail to nose help

    Homework Statement question Solution Homework Equations given in the problem The Attempt at a Solution i did the question exactly like how they did it. expect i did not add the length contraction of 923m to 1000m, then find time.. what i did was find the speed with respect...
  4. S

    Why do astronauts feel weightless inside a space ship and centrifugal force?

    Hello everyone, Ok so I read that the reason they are in free fall is because they are going in a circle like this , and the Earth curves away from them at the same time or something, could anyone explain it to me simply. Also why don't astraunauts get pushed to the periphery of the...
  5. T

    News What were the consequences of Israel's attack on the Gaza Aid Flotilla?

    I'm sure you've all heard about it - a substantial group of people, most of them being peace advocates and the like - have been attempting to ship some food, tents, concrete and other supplies to gaza via a completely peacefull convoy. Of course, Israel's military doesn't like this, and...
  6. L

    Travel time for a space ship at relativistic speeds

    Hi I'm writing a science fiction novel, and I'm trying to figure out how to make an approximation on the travel time of a hypothetical spaceship traveling at relativistic speeds. Given the following: The spaceship is capable of accelerating at a constant 1G, until it reaches a top speed of...
  7. M

    Why don't some online stores ship abroad :/? Mail forwarding service?

    I recently came across Flipkart books, an Indian bookseller that has, fantastically, some very expensive and difficult to locate physics books for almost suspiciously cheap. I checked around online and it seems that most people that had ordered said they haven't had any problems. So I gleefully...
  8. R

    Is it possible to create a ship that won't sink/be destroyed by waves?

    Is it possible for a large ship, say 100 meters long at least, be sufficiently protected that the pressure exerted by any possible waves is not enough to rip the vessel apart? Would this require new structural materials such as the carbon group, because current materials would have to be too...
  9. P

    How was this Naval ship raised?

    I was just doing my rounds on internet news and I came across this picture of a recently sunken South Korean naval ship being raised. http://www.foxnews.com/world/2010/04/25/skorean-minister-torpedo-likely-sank-warship/?test=latestnews Does anyone know what type of vessel is used for doing...
  10. J

    Calculating Doppler Shift with Ship Sonar and Moving Targets

    Homework Statement The sound source of a ship's sonar system operates at a frequency of 23.0 kHz. The speed of sound in water is 1482 m/s. What is the difference in frequency between the directly radiated waves and the waves reflected from a whale traveling straight toward the ship at...
  11. M

    Can Propeller Efficiency be Calculated from Scratch?

    Now i am doing study on vessels propeller efficiency which i can determine the best time to do propeller polishing.Do anyone have any idea on how do i calculate this propeller efficiency
  12. J

    At what speed will stern of ship pass pier?

    Homework Statement The longest passanger liner ever built was the Fracnce, at 66,348 tons and 315.5m long. Suppose its bow passes the edge of a pier at a speed of 2.5m/s while the ship is accelerating uniformly at 0.01m/s^2. At what speed will the stern of the ship pass the pier...
  13. C

    Rocket ship speed and relativity

    ok I know that nothing with mass can travel at c but i have to ask this question. if I am in a rocket ship traveling at .5c and another rocket ship is traveling at .5c in the opposite direction then am I traveling at c relative to him . Probably Galilean transformations don’t work in this...
  14. O

    Buoyancy of ship, volume displaced, and tension of crane (in/out) of water

    A crane lifts the 18,000kg steel hull of a ship out of the water. The density of steel is known to be 7.8 x 103 kg/m3, while that of water is 1000 kg/m3. A) While the steel hull is fully submerged in the water, what is the volume of water displaced by the hull? I really have no idea how to...
  15. I

    Static equilibrium ship problem

    Homework Statement You are on a pirate ship and being forced to walk the plank. You are standing at the point marked C. The plank is nailed onto the deck at point A, and rests on the support 0.75 meters away from A. The center of mass of the uniform plank is located at point B. Your mass is...
  16. W

    Vector displacement between ship and plane

    [b]1. A radar station locates a ship at range 17.3km and bearing 136 degrees clockwise from north. From the same station a rescue plane is at horizontal range 21.5km, 153 degrees clockwise from north, with elevation 2.20km. The vector displacement from plane to ship can be written in the form...
  17. U

    Solving for Distance: Ship A and B at 4pm

    Homework Statement At noon, ship A is 150km west of ship B. Ship A is sailing east at 35km/h and ship B is sailing north at 25km/h. HOw fast is the distance between the ships changing at 4:00pm. Homework Equations ?? The Attempt at a Solution I was able to draw a picture of the...
  18. J

    Plane to Ship Displacement (using component method)

    Homework Statement A coastguard station locates a ship at range 15.4 km and bearing 123° clockwise from north. From the same station a plane is at horizontal range 19.4 km, 150° clockwise from north, with elevation 2.06 km. What is the vector displacement from plane to ship, let i represent...
  19. P

    Magnitude and direction of ship relative to ground

    Homework Statement At the entrance of Ambrose Channel at New York harbor, the tidal current at one time of the day has a velocity of 4.2 km/h in a direction 20 degrees south of east. Consider a ship in this current; suppose that the ship has a speed of 16 km/h relative to the water. If the...
  20. F

    Magnetic acceleration of a ship in space (hyper-particle-acceleration?)

    Magnetic acceleration of a "ship" in space (hyper-particle-acceleration?) ok...was taking a shower and suddenly I imagined something that I thuoght was pretty neat. Now, I am way into sci fi and such, but imagine for a second that if funding and resources was not a problem, that a magnetic...
  21. C

    Calculating Impact Force for Aircraft Landing on Carrier Ship

    Homework Statement An aircraft is landing on a carrier ship in the middle of the Pacific. When the aircraft’s jump cable catches to stop the plane, the aircraft is traveling at 110 mph with the front of the plane 3 feet off the deck of the ship. If the assumption is made that the cable...
  22. C

    Captain of a Ship: Nautical Engineering School Options

    Is there another name for the course of being a captain of a ship? is it nautical engineering? Any school in mind dat i can go to in the near future?
  23. L

    Question on Ship Motion: Calculating Mass, Force, and Submersion

    Homework Statement A ship which is at rest,is connected to land by a chain.The ship is powered by 2 propellers.When the ship is moving ,the 2 propellers push the water backward with velocity 20ms-1,relative to the earth.density(dw)of seawater is 1000kgm-3.Total mass of the ship(M)is 2*107kg...
  24. Buckethead

    Speedy ship flies through the sun

    If a ship was traveling from afar toward our sun at 99.9999... C and skimmed the outer shell of the sun and continued on, would it burn up? From inside the ship, the trip through the shell might take a billionth or trillionth of a second, hardly enough time for the interior of the ship to heat...
  25. B

    Projectile Motion: Safe Distances from Enemy Ship

    Homework Statement An enemy ship is on the western side of a mountain island. The enemy ship can maneuver to within 2500 m of the 1800 m high mountain peak and can shoot projectiles with an initial speed of 250m/s. If the eastern shore line is horizontally 300m from the peak, what are the...
  26. T

    Do Amazon.com ship unreleased items early?

    When ordering something unreleased from Amazon.com, do they take shipping into account so that you'll receive it as close to the actual release date as possible? Or do they ship it on the release date?
  27. O

    Ship traveling cal word problem i keep getting the wrong answer

    At noon, ship A is 10 nautical miles due west of ship B. Ship A is sailing west at 16 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 4 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.) Note: Draw yourself a diagram...
  28. D

    What force is required to rotate a space ship?

    Hi, I was researching the force required to spin a space ship. There is an old thread here but I'm not quite understanding the post. https://www.physicsforums.com/archive/index.php/t-151000.html To move a spaceship forward we have something like F = ma. 1000 kilogram space ship...
  29. X

    Calculate the distance of the ship from the island

    Homework Statement This is a pretty challenging question... if someone could solve it and confirm my answer I would appreciate it. The survivor of a shipwreck lands on an island which is 3000 m from a vertical cliff. He sees a ship anchored between the island and the cliff.A blast from the...
  30. J

    Special Relativity: space ship

    Homework Statement In the far future, a spaceship is traveling from Earth to Saturn at 0.1c when it receives a terrorist threat. The crew learns that a bomb will go off in 3 hours. To prolong this time, the captain accelerates the ship to 0.7c. How long do they have to find the bomb now...
  31. T

    Accelerating a space ship to light speeds

    Homework Statement This question basically tries to investigate the feasibility of using a rocket engine to acclerate a spaceship to relativistic speeds, as with any rocket engine fule is ejected at high velocity and spaceship accelerates to conserve momentum. only that in this situation, the...
  32. R

    Gravitational Forces on Ship Stranded Near Black Hole

    Homework Statement A ship in the shape of a cylinder has length 100m, and mass 1000kg with occupants. It has strayed too close to a black hole with mass 100 times greater than the sun (100*2.0*10^30). The nose of the ship is pointed towards the black hole and is 10km from the center of the...
  33. R

    Is this kind of ship drive possible ?

    I am a member of a hard-science science-fiction group. Many authors in our group are striving to make a realistic science fiction scenario that is physically possible. At the moment we are discussing whether this ship drive idea is possible or not. But few among us are real physicist...
  34. K

    Ship and Dock - Special Relativity

    Homework Statement A relativistic ship is undergoing testing in a station. This involves it flying through a station at speed v/c = (3/4)-1/2, corresponding to the lorentz factor, gamma = 2. Once inside the dock, laser doors simultaneously close at each end. After 1.54 x 10-6s, the testing is...
  35. D

    Speed of ship as fraction of speed of light

    Homework Statement Jane gets in her spaceship on her twenty-fifth birthday and flies to the star Vega at a constant velocity v. She is just turning age 31 when she reaches the Vega system. What is the speed of her ship, as a fraction of the speed of light c? Homework Equations...
  36. V

    What is the relative velocity of a person running on a ship to the shore?

    Homework Statement A ship is traveling at 8.0 m/s at an angle of 50 degrees north of east relative to the water. The water moves at 3 m/s due south relative to the shore. a- Determine the velocity of the ship relative to the shore. b- A person running along the deck of the ship moves at 2...
  37. M

    Building a Flying Ship: Calculating Necessary Horsepower

    im working on a ship that can fly; simple yes . well having a little trubble tring to found out how mutch HP is needed to lift one pound in the air. I am making the engine my self i can't really give to mutch information at this point in time becouse I am still working on the frame work for...
  38. P

    Relation ship between temperature and wats

    Hello there: I need to calculate the expansion (area) of the tungsten when current and voltage is applied in it as conductor. Manuel
  39. M

    Matter-antimatter ship in GR clock paradox - fuel consumption

    hi, recall the familiar round trip - it's more or less the same as in this arXiv article (http://arxiv.org/PS_cache/physics/pdf/0604/0604025v3.pdf) - round trip with acceleration g. me and my friends were wondering the following: imagine that the passenger abroad the rocket travels for 4...
  40. C

    Solve the Ship & Rope Problem: Find Time for Rope to be Wet

    So this one should be simple to solve with some maths. There is a boat of height 15 metres (measured from sea-level) and there is a rope hanging from its deck so that the distance from the sea-level is half the third of the boat's height. It is given that the sea-level is rising at the...
  41. M

    Finding Speed of Ship S: A Vector Question

    Question A ship S is moving with a constant velocity (-2.5i + 6j)Km\h. At time 1200, the position vector of S relative to a fixed origin 0 is (16i + 5j) Km. a) Find the speed of S Attempt No idea, there may be a slight irony in me not being able to do a simple vector question as I...
  42. R

    Can a Particle Accelerator in a Space Ship Reveal Its Motion?

    Referring to fig 1 I have a particle accelerator in a space ship. The accelerator part is a point A and the particles are accelerated to point B. The velocity of the particles is measured by the observer at D and the energy input is measured by a meter at E. All of the points and the...
  43. L

    Position of a ship in a new dimension

    i need some help here, say if there's a ship, no matter how it steers, it will always end up at the starting point, becauses it is in a new dimension, but how do i go about explaining it? thanks!
  44. KenJackson

    Artificial gravity in spinning space ship conumdrum

    In discussions, and novels, about deep space missions, we frequently read of the plan to spin the spaceship to produce artificial gravity. This intuitively makes good sense. But would it work in a ship that is very, very, very far away from any stars or other matter? That is, if the ship is...
  45. V

    What is the speed of the missile, relative to ship B?

    Two spaceships, named A and B, are flying toward each other with relative speed .80c . The captain of ship B knows that ship A uses 2-m-long missiles. She measures the length of the first missile, once it has finished accelerating, and finds it to be only 0.872m long. What is the speed of the...
  46. K

    Questions About Dry Dock Ship Launching Answered

    Hi! I saw from youtube clips that dry dock ship launching use these wooden(?) contraptions. Do they cause damage to the paint coat of the ships? Thanks
  47. S

    Floating Ships: Engineering a Vacuum-Filled Chamber in the Atmosphere

    How big would a vacuum-filled chamber need to be (built with currently existing materials) in order for it to displace enough of the atmosphere so it starts floating? Think about it, such contraptions would work like ships, except they don't float on water this time, but up high in the...
  48. S

    Can You Determine the Weight of a Ship Using Fluid Dynamics and a Volume Meter?

    so your company has built an enormous ship and it is being lowered into a large pool to test if it can float... another company has contacted you to buy your ship and they want to know how much the ship weighs... your company has spent all its money building the ship and you can't afford a...
  49. wolram

    Question for arildno about raising an ancient ship

    Some time ago i saw a prog about raising an ancient ship, it sank on its maiden voyage in your part of the world, do you know of this, was it raised?
  50. wolram

    Alien star ship explosion

    http://www.nasa.gov/centers/goddard/news/topstory/2007/intergalatic_shot.html Solid proof that aliens are about, this must have been a warp core breach.
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