Ship Definition and 247 Threads

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. A

    A ship leaves the island of Guam and sails 285km at 40 degre

    <Moderator's note: Moved from a technical forum and therefore no template.> Is this right? Click on the image for the full question and my answer.
  2. Const@ntine

    Wave Confluence: Ship & Radiotowers (Check Needed)

    Homework Statement A ship floats across the coat, at a distance d = 600 m from it. The radio of the ship receives simultaneously signals of the same frequency from RadioTowers A & B, which are L = 800 m apart. At Point G (Γ), the two waves confluent in a strengthening way, where G's (Γ)...
  3. D

    Applying Bending Stress to a Model of Ship Section

    Good Afternoon. My name is Dimas M. Rachman, i am an undergraduate student majoring in Ocean Engineering/Naval Architecture. I am currently working on my final project. I need to model the effect of bending stress "inside" a plate of ship's deck with Ansys Workbench. Here is a review about...
  4. M

    MHB Ship A & B: Find Min. Speed to Intercept

    ship A is traveling at 30 km hr^-1 in a direction 60 degrees E of N. Ship B is 20 km east of ship A traveling at a constant speed. find the minimum speed of ship B to intercept to intercept ship A i know there distance in the j direction must be the same but when i let 30cos60=xsiny it does...
  5. Buckethead

    B Time dilation of an orbiting ship

    I'm sure this has become a tedious question, but wasn't able to ween out an exact answer through searching. A ship orbits an asteroid using retro rockets to maintain an orbit. The gravity is insignificant and can be ignored. A clock on the ship will tick more slowly than a clock on the...
  6. Kara386

    How far will the ship travel after the engine stops?

    Homework Statement A ship's engine supplies power of 85MW, which propels the ship of mass 5.3×106 kg across the sea at its top speed of 11##ms^{−1}##. The frictional force exerted on the ship by the sea is directly proportional to its speed. If it starts at top speed and then travels in a...
  7. Seth Newman

    Ship Bobbing in the Ocean (Frequency Problem)

    Homework Statement "SpaceForce One" is a perfectly spherical ship of mass 2.5·10^6 kg and Radius 42 meters bobbing up and down in calm seas on Earth At what frequency does SpaceForce ship bob? Homework Equations None explicitly given. The Attempt at a Solution We approached this problem in a...
  8. vansrv8

    I Energy contained in fuel in speed of light ship

    Hi, Simple question. if a ship is getting close to the speed of light its momentum (mass) will continue to increase requiring more energy to propel faster. The fuel in the ship will also gain energy and mass as it accelerates. at C it will require infinite energy because it will have infinite...
  9. ckirmser

    Trip to Space -- Can ship with 1g acceleration escape Earth?

    In another forum, the question was raised, "could a ship with 1G acceleration escape the gravity well of a planet with 1G gravity?" A popular response is, if the craft is aerodynamic, it could accelerate laterally until it reached escape velocity and then manage to get to space. I don't...
  10. Spinnor

    Listen to a steel ship just built in 1943, what do I hear?

    Saw a movie for free on YouTube, "Away All Boats" At minute 4:44 an old timer listens to the ship and hears "her" talking. An ex ship captain explains to the old timer that the sound he hears are built up stresses from welding in the newly constructed ship being released. Has anyone ever...
  11. P

    I feel like a ship without a rudder

    Hello everyone! this is pi day born as in pi day born. Like most of you i also am a student of physics. I am almost done with my undergraduate studies with the final exam to start in weeks. But, I was pretty unfortunate to take any real education in the course of my 4 year university journey...
  12. A

    Relative velocity ship problem intuitively

    Homework Statement Two ships A and B are 4 km apart. A is due west of B. If A moves with uniform velocity of 8 km/hr due east and B moves with a uniform velocity of 6 km/hr due south. Calculate 1) the magnitudeof the velocity of A in relation to B 2) the closest distance apart of A and B...
  13. R

    How would i find the velocity of the ship relative to earth?

    Homework Statement A ship sets sail from Rotterdam, The Netherlands, heading due north at 7.00 m/s relative to the water. The local ocean current is 1.50 m/s in a direction 40.0º north of east. What is the velocity of the ship relative to the Earth? Homework Equations Vr=Vs-Vc r=relative...
  14. Tone L

    I Roll Angle of a Ship: Simple Equation Explained

    I have been on the hunt looking for a precise equation that gives you the angle that a ship is displaced along its x-axis (roll). There is a somewhat simple equation:Roll angle (Θ) : Θ = Acos( ωt+ φ)------where A is the amplitude of the wave, ω is the frequency and φ is the phase chage. So...
  15. D

    The Movement of Electricity in a Space Ship

    Hello. I am an occasional poster here with little background but a big interest in the mental experiments (ME) of Einstein and others. Of particular interest to me are factors related to what I call the Classic Spaceship Mental Experiment. [mentor's note: a link to an unacceptable reference...
  16. L

    Ship draft (draught) word problem buoyancy

    Homework Statement ship arrives from the Atlantic to the Baltic sea. How much does the draft of the ship deepen due to the saltyness of the water... density of atlantic water = 1027kg/m^3 density of baltic water = 1005kg/m^3 at these depths the crosssectional area of the ship can be assumed...
  17. caters

    Writing: Input Wanted Can Humans Survive on a Generation Ship with Alien Protocols and Dinosaur Mates?

    In my most recent story, the aliens have built a generation ship for humans to travel on. These humans are traveling to a planet that has dinosaurs originally from Earth that survived as species. The planet itself is 200 light years away and the ship is traveling at .5 C. I have designed it so...
  18. W

    Calculate sailing ship drag, or anyway any drag of any shape

    Hello there, I'm trying to write a sailing model simulator (for ships with sails) i got buoyancy force and gravity force calculated so far. Before i go any further i need to tell you how i am calculating anything, and what is my ship exactly. First of all i am making that on a phone, it looks...
  19. evinda

    MHB Calculating the Angle between Ship and Rock

    Hello! (Wave) A ship that is at the position $(1,0)$ of a chart ( with the north at the positive direction $y$) "sees" a rock at the position $(2,4)$. Which is the vector that connects the ship with the rock? What angle $\theta$ does this vector form with the direction of the north? I have...
  20. DHF

    Writing: Input Wanted Designing a space ship and with the dust shield

    Hello everyone, I am designing a ship for my sci fi story and I need input regarding the shield. I am trying to make my story as hard sci fi as I can get away with. The story takes place a few centuries from now and details the first expedition to Alpha Centuri. The ship will have a cruising...
  21. C

    A rocket ship leaves earth at a speed 0.6c. When a clock....

    Homework Statement A rocket ship leaves Earth at 0.6c. The clock of the rocket says 1hr has elapsed. (a.) According to the earth clock, when was the signal SENT? (b.) According to the earth clock, how long after the rocket left did the signal arrive BACK on earth? (c.) According to the rocket...
  22. D

    Help My Extraterrestrial Friend Arrive to Madrid's New Year's Eve Party

    I have a friend of mine which is an extraterrestrial. She travels in a ship around the Milky Way. She was likely in the Solar System, and she wants to attend tomorrow New Year's Eve at Plaza del Sol in Madrid, Spain. Her last communication was that she had faced a violent cosmic ray storm, and...
  23. K

    What happens to an object in a free-falling ship?

    The answer to this question should be obvious, but I want to make sure. I'm writing a quiz containing difficult general-science questions. One of the questions is: "You’re in an unpowered spaceship that’s going around the Sun in a very off-kilter (i.e., highly eccentric) orbit. Just as your...
  24. novaprime

    Ship to ship combat with an unknown invader

    I'm writing a short story (which if holds true to form is going to turn into a hundred page mini book). Basically it's set along the border of two human nations in space. Aliens are known and there is some trading and visitations, and some wars. The story is following a captain of a heavy...
  25. TyroneTheDino

    Conservation of Momentum of astronaut leaving ship

    Homework Statement An astronaut is pushed from her ship at a velocity of 2m/s. Her weight including her tool belt is 120kg. Remembering Newtons 3rd law, she takes 5 seconds to decide to detach her belt and throw it away from her. The 20kg tool belt leaves her suit as she throws it in front of...
  26. S

    Calculating Ship Time w/ Varying Acceleration in Relativity

    My only experience with special relativity has been in an introductory Modern Physics course. In that course I think we mostly used constant velocities or if we did do anything with accelerating objects the acceleration was constant or changed very few times (you can just add the few changes.) I...
  27. K

    Tubular space ship rotates and falls

    Homework Statement A spaceship has a shape of a hollow tube with outer radius R1, internal radius R2 and mass "M". it rotates at angular velocity ω0. it has 4 short, mass less legs. In it there is a bar of radius "r" and mass "m". it can be moved instantly to any distance "a" from the center...
  28. R

    Container stack height on a ship: Mechanical strength

    In the photo of a container ship cargo seems stacked 12 high. I do know that there's lateral supports etc. that are not visible in the figure, yet the vertical load, isn't that transferred downwards to the bottom container? Or is there some way to support the stack at an intermediate point so...
  29. 1977ub

    Clocks Within Each Ship in Bell Spaceship Paradox

    I believe length contraction always makes more sense when integrated with reminders of relativity of Simultaneity. Let's say the engines are at the back end of each rocket. For the viewer "A" in the initial frame, they begin moving and continue accelerating simultaneously, and clocks next to...
  30. hgducharme

    Calculate acceleration of a ship fired from a cannon

    Homework Statement Jules Verne [/B]In his novel From the Earth to the Moon (1866), Jules Verne describes a spaceship that is blasted out of a cannon, called the Columbiad, with a speed of 12,000 yards/s. The Columbiad is 900 ft long, but part of it is packed with powder, so the spaceship...
  31. Razorback-PT

    Why does the Discovery ship from 2001: ASO need an airlock?

    I was wondering if this is a mistake in the movie. Notice how those pod doors open directly into space. What happens to the air when those doors open? Is it still in the realm of possibility that this room functions as an airlock? Why the need for the second smaller airlock then?
  32. B

    Can a Ship Enter a Harbor? Calculating Depth Using h(t) = 3 + 2sin(0.5236t)

    Homework Statement h(t) = 3 + 2sin(0.5236t) h = depth in meters (water) t = number of hours after 7 1) A certain ship can only enter the harbor if the depth is 4.5m or more. For how long can this ship stay at the harbor? Homework EquationsThe Attempt at a Solution I tried getting both of the...
  33. W

    MATLAB Generally, How the ship motion is calculated base on MATLAB?

    Generally, How the ship motion is calculated base on MATLAB?
  34. W

    Viscous Hydrodynamic Forces and Ship Velocity: An Analysis

    The viscous hydrodynamic forces will increase with increase of the velocity of ship？ Can the viscous hydrodynamic forces be neglected if the velocity of ship is small　？
  35. W

    The Role of Nonlinear Hydrodynamics in Ship Leaning & Capsizing

    Can the nonlinear hydrodynamic be ignored in the process of a ship leaning slowly， and the ship capsized ultimately. Thanks！
  36. W

    Can you tell/give me any websites about ship hydrodynamics？

    Can you tell/give me any websites about ship hydrodynamics？ Thanks！
  37. T

    Could a person do this? -- Push a cruise ship by hand

    I was watching a program on the worlds largest cruise ship, the Oasis of the Seas. It displaces 243000 tons. They we're discussing the sophisticated maneuvering systems and I got to thinking. Let's say the ship is docked, within a foot of the dock and untethered. If I sat down with my legs...
  38. T

    A Space Ship with 3 main power sources

    I'm building a spaceship and making a movie where a long spaceship is encased in laser shielding that doubles as laser propulsion. Plutonium is 1 power source ideally between the sun and target star. The movie is titled The Finish Line. Clear pipes around the ship are filled with water and...
  39. E

    Ship Mounted Coilgun Measurements

    In the story I am currently working on, a weapon commonly used on ships is a sort of coilgun. I want to create a ratings system for these coilguns and want to know the range of ampule-turns that would be used in large coilguns (barrel diameters range from six inches to two feet).
  40. K

    What is the Average Velocity of a Ship and the Velocity of the River Current?

    Homework Statement A ship goes from A to B at v_1=10 km/h and from B to A at v_2=16 km/h Find: (1) the average velocity of the ship, and (2) the velocity of the river current. Homework Equations v_{avg}=(v_1+v_2)/2 v_{AC}=v_{AB}+v_{BC} The Attempt at a Solution...
  41. G

    Space ship angular deceleration

    I am programming an addon for a space game/simulation (Kerbal Space Program) and I am looking for some help with a bit of physics. The part I need a little help with is related to attitude control. If the ship is rotating, is there a mathematical way to calculate when it needs to begin to...
  42. S

    A rather large interplanetary ship

    Right, this is for the same universe as the "Two Planets" thread. To reiterate the backstory, the star system was colonized by an interstellar human civilization at some point in the future, but that civilization fell, the colony worlds were set back to the bronze age, civilizations rose, and...
  43. M

    Is it possible to tell whether ship is moving or not?

    Consider a hypothetical bus drifting along at a uniform speed in the vacuum and a hypothetical insect which crawls inside the bus without any physical contact with it. I think in a moving bus the insect suffers lot of crashes, which can be used to know whether the bus is in motion or not...
  44. M

    MHB Finding the Distance Between Buoys: A Cruise Ship Balcony Problem

    Not really sure how to do this problem. I'm not even sure where the angles are. 5. The balcony of a cruise ship is 25m above sea level. A person standing on the balcony sees two buoy’s in the water below. The first buoy is situated directly east of her at an angle of depression of 32°. The...
  45. R

    Two entangled particles One on Earth, the other on a space ship

    First off I'd like to say my understanding of physics isn't very good, so I'm sorry if this question is a non sequitur. Suppose we have two entangled particles, one on Earth, and the other on a ship that is traveling away from Earth at near to light speed. According to quantum...
  46. D

    Rocket ship conservation of mometum

    Homework Statement Interstellar Spaceship An interstellar spaceship with initial mass Mo is at rest at the edge of a small, spherical nebula (gas cloud). At t= 0, the engines begin to fire, ejecting gas out the back at constant speed u relative to the rocket. The mass of the rocket decreases...
  47. T

    Ship Berthing Energy Forces On Piles / Fenders

    I am looking into the forces as a result of berthing energy from a ship on a pontoon. The situation i am looking at is a simple pontoon of about 10 m long with mono piles on each end. I am assuming a ship impacts the pontoon at mid span between the piles. The pontoon has fendering on its...
  48. D

    How much force is required to stop a space ship?

    Homework Statement A spaceship is accelerating at ##1000# m/(sec per sec). How much force is required from the backthrusters to completely stop the spaceship? Homework Equations The Attempt at a Solution Let's assume the spaceship has mass ##m## and no mass is lost when firing...
  49. gfd43tg

    What is the Weight of the Capsized Battleship Oklahoma at Pearl Harbor?

    Homework Statement The battleship Oklahoma was attached at Pearl Harbor by Japanese dive bombers. The ship was hit by multiple torpedoes and capsized (rolled 180 degrees so the bottom of the hull pointed straight up). The final orientation of the ship had 20 percent of its height above the...
  50. M

    How to ship catalytic material into the US

    Hi all, Have any of you ever sent materials such as catalysts overseas? Very much appreciated Marcio
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