Ships Definition and 84 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. Biosyn

    How Do Cruise Ships Manage Their Water Supply?

    Do cruise ships store clean water aboard in tanks or do they use desalination systems? Or do they take on water from their destination ports? I did a search online and I couldn't find any reliable sources. Is it any different on an ocean liner?
  2. T

    Finding Theta: Aiming a Gun Between Two Ships

    Homework Statement Two ships are traveling parallel to each other in opposite directions with seed v1 and v2. One ship fire on the other. At what angle should the gun be aimed at the target ship in order to make a hit if the shot is fired at the instant when both vessels are on the straight...
  3. nearc

    Another two ships relativity question

    I wanted to double check my calculations an interpretation of relativity. Thanks in advance. Two identical ships leave the same point at the same time traveling .999C and travel a 100 light years each but leave on paths that are 10 degrees apart. If the passengers where to compare their...
  4. S

    Question about 2 ships - vectors?

    Homework Statement Ships A and B leave port together. For the next two hours, ship A travels at 35 mph in a direction 20° west of north while the ship B travels 10° east of north at 40 mph. (a) What is the distance between the two ships two hours after they depart (in miles)? (b)...
  5. A

    Could not complete my project on ships

    hi every one I'm new here so i am confused as to where to post this topic but i guess this is the right place. I am having a science project in my school and I am building a ship that could go a particular distance and return to the same spot again.There are restrictions that I cannot use...
  6. H

    Comparing Ropes Released from Ships A and B in Relative Motion

    Suppose we have two ships A and B in uniform motion according to each other(A claims B to in motion and B claims A to be in motion). Let each one of the objects have a roll of rope on it (let us call the ropes a-> for A's rope and b-> for B's rope). Now when the ships were initially close to...
  7. nearc

    Simple relativity question [two ships]

    two identical ships launch on parallel paths r distance apart. the are completely alone [nothing to affect them gravitationally [but themselves]]. once they reach some velocity v [they both reach the same velocity at the same time [everything is identical]] they turn off their engines and...
  8. J

    Is it Ethical to Condemn Unborn Generations to a Life on a Generation Ship?

    With our present level of knowledge the only possible way for humans to leave the Solar system would be “Generation Ships”, large relatively slow spaceships that would take several generations to reach their destination. Even if such ships could be constructed, is it morally acceptable to...
  9. A

    Relative Velocity of Two Ships: When Is Their Separation Least?

    Hi, I'm having difficulty with this problem, and was hoping whether someone could lend me a hand? After being provided with this info; Ship A is located 4.0 km north and 2.5 km east of ship B. Ship A has a velocity of 19 km/h toward the south and ship B has a velocity of 40 km/h in a...
  10. D

    How Do Ships A and B Move Relative to Each Other?

    Two ships, A and B, leave port at the same time. Ship A travels northwest at 19 knots and ship B travels at 28 knots in a direction 40° west of south. (1 knot = 1 nautical mile per hour; see Appendix D.) (a) What is the magnitude the velocity of ship A relative to B? 35.181 knots (b) What...
  11. T

    Time & Bearing of Ships A & B 120 Miles Apart

    Two ships, A and B, leave port at the same time. Ship A travels northwest at 29 knots and ship B travels at 39 knots in a direction 40° west of south. After what time will the ships be 120 nautical miles apart? What will be the bearing of B (the direction of B's position) relative to A at that time?
  12. J

    Are Airships Making a Comeback for Cargo Transport?

    Has anyone seen the recent new in the last couple of years about the comeback potential of the Zeppelins or Airships? There seems to be a good argument about the efficiency of these ships in regards to cargo transport. I can see the environmental impact and perhaps the construction costs and...
  13. J

    Effect of water displacement on gravitation pull between ships

    I calculated, using Newton's formula F = GmM/r^2, that the gravitational attraction between two large, full oil tankers whose sides are touching would be 1,331 lb., given the mass of each ship as 6.5 x 10^8 kg, distance between their CG's of 69 m, G = 6.674 x 10^-11 N(m/kg)^2, and 1 N = 0.2248...
  14. J

    Ships, locks and potential energy

    Hello! I have been pondering about potential energy and ship locks. Big ships tend to have great mass but are also, hopefully, able to float. So I am wondering if the water in a lock gets compressed by the ship's force of gravity? If not, you could raise the ship by pumping water into...
  15. J

    Why Can't Space Ships Use Propellers or Jets for Manoeuvrability?

    The question is why space ships cannot use propellers or conventional airplane jets to move in space?
  16. B

    Ships in Distress: Who Will Reach First?

    Homework Statement A ship in distress sends up flares that are visible to two other ships. The athabasca notes that the flares are a N41 degrees E of its position. The Britiannia, which is 12.7 nautical miles due east of the athabasca sees the flares at a bearing of 310 degrees. will the...
  17. J

    How Do Ships A and B Move Relative to Each Other?

    Homework Statement Two ships, A and B, leave port at the same time. Ship A travels northwest at 22 knots and ship B travels at 29 knots in a direction 40° west of south. (a) What is the magnitude the velocity of ship A relative to B? (b) What is the direction of the velocity of ship A...
  18. D

    News Iranian speedboats threaten US ships.

    These boys in the speedboats just about got themselves lit up: http://www.foxnews.com/story/0,2933,320587,00.html" I believe the US showed a fair bit of constraint in this situation. It looks to me like they had the right to take out those speedboats but didn't. What would have been the...
  19. Evo

    News US, Japan eye China after ships barred

    Seems China is sending signals, but what is the message? http://news.yahoo.com/s/ap/20071130/ap_on_re_as/china_us_navy
  20. M

    Solving the Ships P and Q Problem

    Two ships P and Q are traveling at night with constant velocities. At midnight,P is at point with position vector (20i + 10j) km relative to fixed origin 0. At the same time, q is at the point with position vectro (14i - 6J)Km. Three hours later, P is at point with position vector (29i + 34j) Km...
  21. B

    Ships A & B Separating: A Math Problem

    Homework Statement Ship A travels at 10 knots on a due north course and passes a buoy at 8am. Ship B, traveling on a due east course passes the same buoy at 10am. How fast are the ships separating at 12 am? Homework Equations The Attempt at a Solution I'm not familiar with knots...
  22. N

    Cable connecting the two ships homework

    Homework Statement A tugboat of mass m pulls a ship of mass M, accelerating it. Assume that water friction on the two vessels' is negligible. If the force acting on the tug's propellar is F, what is the tension, T, in the cable connecting the two ships (Variables: F, M, m)...
  23. quasar987

    Buy "I am interested in buying" at a Better Price - Ships to Canada!

    I am interested in buying http://www.amazon.com/dp/0198500483/?tag=pfamazon01-20 but I find the amazon price a little high! Do you know of a place that ships to Canada that might have this title for sale? Thx.
  24. P

    Two cargo ships (Fluid Mechanics)

    Problem: Consider two identical ships, one loaded with a cargo of cork (which floats), and the other empty. Which ship displaces more water? My answer: V=V m_1>m_2 and, \rho_1=\frac{m_1}{V} \rho_2=\frac{m_2}{V} so, \rho_1>\rho_2 \rho_1 displaces more water because the mass added...
  25. D

    When Will Ships P & Q Be Closest to Each Other?

    A ship P is traveling due East at 30 km/h and a Ship Q is traveling due South at 40 km/h. Both ships keep constant speed and course. At t=0 they are each 10 km from the point of intersection of their courses and moving towards the point. Iv found the co-ordinates of Q relative to P at...
  26. A

    Co-Accelerating Ships: Explaining the Problem

    I'll describe the problem in my own words. The co-accelerating ships problem: -There are two identical spaceships which are initially at rest in "lab-frame". -These two ships perform IDENTICAL acceleration procedure. -The ships are launched simultaneously in the lab-frame...
  27. P

    So two ships leave earth in opposite directions

    This has probably been answered before, but I couldn't find it online. So two spaceships leave Earth in opposite directions. Suppose they are both traveling away from Earth at .4c. From one of the ships, how fast would the other appear to be moving away? And then, same question, except...
  28. O

    Space Ships faster than light.

    Dear Michio Kaku. I wanted to ask a question about traveling in space with a space ship. If a spacecraft emits a dense electron field around itself extended out to space in all directions from the craft, Wouldn't this electron force field (Electrons themselves) allow the material of the...
  29. E

    What Is the Strongest Material for Constructing Spaceships?

    What is the highest tensile strength material known to man? can we use for builsing a spaceship or o neil habitat? I think it has to be titanium based, but what is it. Is it possible to alloy titanium with something exotic like ---- e.g uranium? No?
  30. C

    How fast is the distance between two ships changing?

    Hello all I need help with the following question Two ships A and B are sailing away from the point O along routes such that angle AOB = 120 degrees. How fast is the distance between them changing if, at a certain instant OA = 8 mi. OB = 6 ,i., ship A is sailing at the rate of 20 mi/hr...
  31. L

    When should a coastguard cutter start out to intercept a ship?

    Hi, I have this question which I am having trouble with A ship is steaming parallel to a straight coastline, distance D offshore, at speed v. A coastguard cutter, whose speed is u (u<v) seta out from port to intercept the ship. Show that the cutter must start out before the ship passes a...
  32. Q

    How Do You Calculate the Distance and Relative Speed Between Two Ships?

    Ships A and B leave port together. For the next two hours, ship A travels at 35.0 mph in a direction 25.0 degrees west of north while the ship B travels 80.0 degrees east of north at 30.0 mph. What is the distance between the two ships two hours after they depart? What is the speed of ship A...
  33. N

    Degaussing Ships: What do You Know?

    Degaussing ships?? Does anyone know how ships are degaussed exactly? I know that basically very thick electrically conducting cables are wrapped around perpendicular to length of the ship. Large currents are then sent through in an effort to cancel out the ships magnetic field. If anyone...
  34. D

    Big ships can be fast but big planes cannot.

    Just before world war 2 there were many big planes and tanks that had lots of guns but were slow. People were trying to make the equivalent of battleships which had lots of guns and armor and were often faster than than smaller ships. however large planes and tanks were impractical. Why?
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