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. Psinter

    Old Engineering: A ship that moves by harnessing the power of fire?

    This is bothering me way more than it should. Ever since I saw the following image: http://i.imgur.com/iUZsw3Cl.jpg?1 (This is a fraction of a set of pictures that contains other cool people with quotes that would be considered "ignorant" nowadays. All credit goes to the original author. I have...
  2. A

    Can you see inside a space ship moving at the speed of light?

    Lets pretend I am in a spaceship and I am moving at the speed of light. There is a light bulb at the center of the ship. I understand that velocities don't simply add together, and the formula is v_{3}=\frac{v_{1}+v_{2}}{1+\frac{v_{1}v_{2}}{c_{2}}}. So the light would not be moving in your frame...
  3. PsychonautQQ

    Special Relativity and Ship Problem

    Homework Statement A ship is traveling at .8c, and sends a message to Earth to saying he's fine. 15 minutes later he realizes he made a typo and sends another message. How long does it take for the second to message to arrive at Earth after the first one arrives? Homework Equations...
  4. F

    How much water is needed to float a ship

    Hi all.Some time ago there was a post regarding the the title of this post. ie is it possible for a ship to "float" in a mere few liters of water. I can not find the thread now. Does Admin have a link to this discussion please. Thank you
  5. Z

    Decelerating a Constantly Accelerating Ship

    This is simply a thought experiment. Say that I had a spacecraft capable of constantly accelerating or decelerating at a rate of 1g to 3g. I want to hit a target 20 light years away. How would I know where along the way to turn the ship around if I wanted to end at my destination decelerating...
  6. G

    (Almost) Black Hole = Fast Space Ship?

    Hello, I am new to this forum! I have only just completed my first physics class, but I like to learn about some of the more advanced topics in physics on my own time. I was watching a video about black holes and I noticed a part of the video that stated "any matter that enters this...
  7. E

    Artificial gravity ship: Floor?

    The other day, I was learning about creating "artificial" gravity by building a gigantic circularly shaped ship which would revolve at a frequency such that the centripetal acceleration coincided with the acceleration due to gravity g (analogous to the shape and movement of earth). I can...
  8. R

    How Does A Ship Float on A Glass Of Water

    Homework Statement How Does A Ship Float on A Glass Of Water other than that he didnt gave me any details or it is really possible for a ship float in a glass of water in concept of density and buoyancy it's just our first week in class and i don't really have any idea PLEASE HELP !
  9. D

    Buoyant Force of a ship and water

    Homework Statement Consider a ship that is floating in fresh water. The bottom of the ship is a depth of (df) below the surface. If the same ship is floating in sea water, the bottom of the ship (ds) below the surface. Given that the density of sea water is greater than the density of fresh...
  10. M

    Conservation of momentum problem regarding a missing mass of a ship

    Homework Statement After a malfunction, an astronaut escapes from a doomed spacecraft by using an escape pod that is blown off of the ship. The small explosion sends the pod flying away at 34.9 m/s, while the main ship moves in the opposite direction at the speed of 1.89 cm/s. If the...
  11. K

    Find period of astronaut when Normal force of ship = normal force on earth

    Homework Statement If the gravitational acceleration at Earth's surface is given by: g = GMe/Re^2, show that the period of rotation of a spaceship needed to make an astronaut feel the same normal force on the ship that they would feel on Earth, when it is given by T = √[(4pi^2)(Rs)(Re^2)/GMe]...
  12. W

    MHB Ship problem,related time change

    A ship sailing west at 9am with velocity 20km/h. after one hour another ship sailed from the same port with velocity 40km/h at 60 north of west . find the rate of increase of the distance between the two ships at 11am Can someone please show me how to solve this? i have no idea
  13. M

    Acceleration of Space ship with thrust

    New to the forum looking for Acceleration of Space ship with thrust The first stage of a space vehicle consumed fuel and oxidizer at the rate of 1.90 104 kg/s with an exhaust speed of 3.45 *10^3 m/s. (a) Calculate the thrust produced by this engine. I got 65550000 N this answer was...
  14. V

    Protecting cruise ship in harbor against hurricane?

    Hi folks, Some people allegedly claim it is better to have a cruise ship out in the ocean rather than in harbor during a hurricane. I don't quite believe it however. I can imagine a cruise ship slamming against docks and getting damaged, but in the ocean it could easily overturn and sink...
  15. W

    Relating speed and engine horsepower of a ship to water resistance

    Homework Statement The aircraft carrier John F. Kennedy has mass 7.4*10^7kg. When its engines are developing their full power of 280000 hp, the John F. Kennedy travels at its top speed of 35 knots. If 70% of the power output of the engines is applied to pushing the ship through the water, what...
  16. D

    Understanding Results from a Relativistic Star Ship Calculator

    Hello, first time poster here! I am trying to understand some results I am getting from this "Relativistic Star Ship Calculator". This site sets up the question I'm trying to answer exactly like I imagined it should (thanks to The Forever War). From the description: The star ship...
  17. H

    A ship, earth, and a missile. Which time gests dilated and why?

    Homework Statement "A hostile spacecraft approaches your outpost on a distant planet at a speed of 0.3c. When it is at a distance of 3.0*10^{7} km you launch a missile at the enemy with a speed of 0.5c. How much time will elapse before the missile hits the enemy spacecraft as seen in...
  18. G

    Consciousness and the Ship of Theseus

    I'm sure many of you have heard of the ship of Theseus. If not, http://en.wikipedia.org/wiki/Ship_of_Theseus "The ship wherein Theseus and the youth of Athens returned [from Crete] had thirty oars, and was preserved by the Athenians down even to the time of Demetrius Phalereus, for they took...
  19. vibhuav

    Tiny rocket in Galileo’s ship to detect motion

    Let’s consider Galileo’s description of relativity of motion using the example of a moving ship. The ship is at rest and made to accelerate extremely slowly for a few minutes, and then moves at a constant velocity. When the ship is moving at some constant velocity, the contents of the ship will...
  20. T

    Choosing the Right Point to Start Building Your Ship

    Lets say you want to quickly pick points in order to nail some wood together to build a wooden ship. You can use one line to pick numerous points, or you can pick 1 precise point using two lines on a flat surface that is 2 dimensions. You can use various angles in between these two lines, or...
  21. A

    Would a relativistic ship really need much shielding?

    Hi all, It doesn't seem that a relativistic ship traveling in deep space would need much shielding due to particles at rest in the space frame, appearing relativisitc now in the ship's frame. Here's the calculation I did: Let's imagine a ship the size of a space shuttle traveling with γ of...
  22. C

    Volume of water a ship must displace to float

    Homework Statement What volume of water must a ship that masses 2.00x10^5 kg displace to float? Homework Equations density = mass/volume density of water = 1.00x10^3 The Attempt at a Solution 200,000/1000 = 200 m^3 im guessing that in order to float you must displace your own...
  23. A

    References for a Lightspeed Ship

    I searched this site and could not find any referances for what a good lightspeed ship would look like. Does anyone know of any good books or references on how to design ships that travel near light speed? Here's a few things I do know people speculate on: It would be sleek. Stationary...
  24. S

    Calculating Length of Ship B in Frame Ref A

    Homework Statement -------------->Va Vb<--------------- FRAME REF A FRAME REF B -------------------------------------------- Stationary frame ref C An observer using the frame Ref A, calculate the length of ship B and the time it takes for the whole of ship B to pass by...
  25. J

    Solving A-B-C Ship Journey with Motorboat

    a ship A is traveling due east at a speed of 8m/s and a ship B is traveling due south at 10m/s. At an instant when A is 3km from B in a direction 060 a motor boat leaves A and travels in a straight line to B with speed 14m/s 1) show it reacges B in 500 seconds 2)if upon reaching B the motor...
  26. F

    Ship and Iceberg - Speed of sound question

    Homework Statement 17.While cruising the North Atlantic in a fog, a ship blew its horn, and received an echo from an iceberg 4.0 s later. The temperature of the air was 5°C, the temperature of the iceberg was 0°C, and the temperature of the water was 2°C In order to calculate the distance...
  27. S

    Why Didn't the Ship Sink When a 15kg Bird Landed on It?

    Why the ship does not sinks? A ship is loaded in such a way that even if a single coin is loaded on it more, the ship will sink. However, after it travels some distance in sea, a bird weighing 15 kg dies and falls on the ship but the ship does not sinks. Why?
  28. N

    Related rates and sailing ship

    Homework Statement At 9 a.m ship A is 50 km [E] of ship B. Ship a is sailing [N] at 40 km/h and ship B is sailing [S] at 30 km/h. How fast is the distance between them changing at 12 am? Homework Equations x^2 + y^2 = z^2 dz/dt [t=3h] = ? db/dt = 30 km/h da/dt = 40 km/h The...
  29. S

    Conservation of Momentum involving a space ship blowing up into three pieces

    Homework Statement A spaceship of mass 2.30×10^6kg is cruising at a speed of 5.40×10^6m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 5.20×10^5kg, is blown straight backward with a speed of 2.20×10^6m/s. A second piece, with mass...
  30. H

    Why do iron ships float in water?

    If you drop an iron nail into water it sinks. But a ship made up of iron floats in water. Please explain this to me.
  31. S

    Motion into direction ship problem

    Homework Statement You are the navigator of a ship at sea. You receive radio signal from 2 transmitters A & B which are 100 Km apart, one due south of other. The direction finder shows you that transmitter A is at a heading of 30 degree south of east from the ship. while transmitter B is due...
  32. S

    Nuclear powered cargo ship question

    I was doing some internet research on the idea of using nuclear reactors for cargo ships, and a couple of sites I found discussed the possibility of building fast cargo ships (> 30 knots) that would run on nuclear power so that they wouldn't face the economic difficulties with fuel price. E.g...
  33. S

    Space ship design idea, how to approach with out air resistance

    ok so here is what i was thinking when a spaceship enters the atmosphere the reason for the high impact velocity is that the air is spinning at 66000mh AND that to keep an orbit you need certain speed with is different from the Earth's rotation... now if you slow down/speed up to match...
  34. T

    In order to float, how much water must ship displace?

    Homework Statement A ship that has a mass 10 million kg must displace how much fresh water in order to float? A. 10 million N B. 9.8 million N C. 98 million N D. 980 million N Wrong Points Earned: 0/1 Correct Answer: A Your D Homework Equations p=f/a density=rho...
  35. 1

    Work/energy/kinematics rocket ship problem

    Homework Statement A rocket of initial mass of 2.85x10^6 kg is on the surface of the earth. if the initial acceleration is .20g, what is the required thrust? if the fuel is burned at a rate of 14,500 kg/s, with what speed is it ejected from the rocket? Homework Equations The...
  36. DaveC426913

    Age Ratio of Ship and Boiler

    The ship is twice as old as the boiler was when the ship was as old as the boiler is. What is the ratio of their ages? I do believe I have solved this (without Googling) and have uploaded my answer online with a timestamp of 10:35PM 4/27/2011 (i.e. before I posted this). Let me know...
  37. D

    Could a bullet shot from a spaceship orbiting Earth escape the planet?

    This question should be fairly simple, I think. What happens when you are in a spaceship orbiting around Earth and you shoot a bullet out the window right towards earth, i.e. towards Earth's center of gravity, assuming the mozzle velocity is much smaller then the orbital speed of the space...
  38. H

    Large ship propulsion. (Orion revisited)

    Colony ship propulsion Hello. I've identified a huge problem in my novel and would appreciate any help. Short version: How much mass can you safely move, given 100-200 years travel time, to a nearby star system using the world's nuclear stockpile for pulse propulsion? This would be...
  39. L

    Ship wing. Do they have to be Delta?

    I'm designing a new spacecraft model, but it does not use Delta wings, like most ships do. I need them to be efficient, because my ship is kinda large. (It's like a hybrid of a rocket, and the Space Shuttle), and so I have two questions: 1) My craft's wings look like really tall right...
  40. B

    Kinematics - Packing falling from plane to ship type problem.

    [PLAIN]http://img600.imageshack.us/img600/1236/kinema.jpg Focusing on the plane first: When the package is let go, it has a Vy of V, no acceleration, so y=Vy*t In the z direction: a=-g Vz=-gt z=.5H-.5gt^2 In the x direction: x=0 Now for the ship: Given is Vs=Vx=U-at...
  41. G

    Fuel Consumption of a Ship Traveling at Near Light Speed

    Imagine this scenario: An "airplane" that runs on some type of fuel, let's say, liquid, reaches 90% of the speed of light. Once it achieves this speed, will the ship require less fuel due to time dilation, the same amount of fuel due to time dilation, or more fuel to maintain a constant...
  42. M

    How Fast is the Distance Between Two Ships Changing at 4:00 P.M.?

    Homework Statement At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km h and ship B is sailing north at 25 km h. How fast is the distance between the ships changing at 4:00 P.M.? Homework Equations The Attempt at a Solution I did it using geometry and...
  43. A

    Momentum conservation? stranded in space push on something to get to ship

    Homework Statement You have a 99 kg mass and are stranded away from your ship, at rest, next to a giant 1800 kg ball of space doody. You push on the doody giving it a speed of 0.11 m/s directly away from the ship. Seven-and-a-half seconds later you come into contact with your ship. What was...
  44. H

    Special Relativity Ship Problem

    Homework Statement A ship (attached to reference frame S') passes us (we are standing in reference frame S) with velocity = 0.920c. A proton is fired at speed 0.975c relative to the ship from the front of the ship to the rear. The proper length of the ship is 775 m. What is the temporal...
  45. B

    How far into the water a ship sits (buoyancy, draft)

    Homework Statement Consider a large cargo ship, with a steel (density = 7.5g/cc, 7500kg/m^3) hull. If I ignore the mass of the front and back of the ship, how far into the water (height) will the ship sit? Homework Equations density = m/v Force(buoyancy) = (density of fluid)(volume...
  46. P

    Ship at Sea, Apparent Weight Problem

    Correct? Please let me know if my logic is off. Thank you =] Given Problem At the bow of a ship on a stormy sea, a crewman conducts an experiment by standing on a bathroom scale. In calm waters, the scale reads 180 lb. During the storm, the crewman finds a maximum reading of 234 lb and a...
  47. J

    Whether the boy can catch the ship? relative velocity

    Homework Statement see upload file Homework Equations The Attempt at a Solution consider relative velocity and show that boy can go back to origin. thanks!
  48. P

    To find out forward force of a ship

    Homework Statement the mass of a ship is 15000kg. force of friction is 12000n acceleration is 2m/s2. find resultant force and thn the forward force Homework Equations resultant force = mxacc 15000x2=30000 The Attempt at a Solution unable to calculate the forward force but think...
  49. M

    Star ship acceleration physics

    Homework Statement The Starship Enterprise returns from warp drive to ordinary space with a forward speed of 56km/s. To the crew's great surprise, a Klingon ship is 120m directly ahead, traveling in the same direction at a mere 24km/s. Without evasive action, the Enterprise will overtake and...
  50. B

    Related Rates Ship Distance Problem

    Please answer this, it's so hard. Problem: At 12 noon, ship A travels due west at 100 knotsshiop B. After 4hours, ship B leaves the same port on the direction N30'W at 80 knots. How fast is the distance between two ships changing at 8PM in the same day? Reply please.I can't solve it...
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