![]() |
||||||||||||||||||||||||||||||||||||||||||||||||
Odds 'n' Ends |
||||||||||||||||||||||||||||||||||||||||||||||||
IF YOU'VE EVER WORKED ON A SHIP... Missing Ship Life? Always Remember: In the real world... In the real world, you don't have to be back one hour before your house starts moving. In the real world, if you vomit, people will not treat you as though you have just released the Ebola virus into widespread circulation. Neither will small men in outbreak suits appear to hose down your house. Nor will you have to spend 72 hours locked in your bedroom watching a parade of dreary Meg Ryan films. In the real world, Bingo is a game for old people, and the rules do not stipulate that only Filippinos can win. In the real world, when people ask you how you are, you do not have to be "Excellent". You could be "Not bad", "Hungover", "Bloody awful" or dispense with words completely and resort to hand gestures. In the real world, there are more than three episodes of The Simpsons. In the real world, there is no need, on a weekly basis, to simulate how you would respond if your house was on fire (my advice is to get out). Neither do you have to stand outside for 30 minutes in all weather conditions wearing an oversized, luminous orange puffy jacket. In the real world, you will not get 20% discount at all shops. That said, the shops will stock items which are useful to you.- In the real world, skinless grilled chicken, fetuccini alfredo and New York cheesecake are not always available. In the real world, you can have a fight in the pub and not be sacked the moment you turn up for work the next day. In the real world, people work for five days and then have two days off. They do not go to work one morning and return home six months later (what sort of demented idea is that?) In the real world, you can sit on the toilet and flush it without the concern that your intestines may be sucked out and dragged down to an unknown destination several floors below. In the real world, flu jabs are not a requirement therefore you do not need to pretend to be allergic to eggs to avoid them In the real world, relationships can work.... In the real world you can get as drunk as you like. You will not be breathalysed during the night to ensure you are capable of dealing with any nocturnal emergencies (eg. your house sinking or the helicopter evacuation of an overweight American from your roof.) In the real world it is possible to do things discretely. In the real world your key is made of metal and is cool when it gets magnetised. In the real world your life is controlled by your partner not by a guy who calls himself the Master and speaks with a odd italian/norwegian/dutch accent!!! Ship Life? |
||||||||||||||||||||||||||||||||||||||||||||||||
How do cruise ships float?
Question I do not understand how a boat can float. How can giant things made of steel weighing thousands of tons float? If you were to melt it all into a big cube of steel it would definitely sink. How can the water tell the difference in the shape between a boat shape and a cube shape? Answer The standard definition of floating was first recorded by Archimedes and goes something like this: "an object in a fluid experiences an upward force equal to the weight of the fluid displaced by the object." So if a boat weighs 1,000 pounds (or kilograms), it will sink into the water until it has displaced 1,000 pounds (or kilograms) of water. Provided that the boat displaces 1,000 pounds of water before the whole thing is submerged, the boat floats. It is not very hard to shape a boat in such a way that the weight of the boat has been displaced before the boat is completely underwater. The reason it is so easy is that a good portion of the interior of any boat is air (unlike a cube of steel, which is solid steel throughout). The average density of a boat -- the combination of the steel and the air -- is very light compared to the average density of water. So very little of the boat actually has to submerge into the water before it has displaced the weight of the boat. The next question to ask involves floating itself. How do the water molecules know when 1,000 pounds of them have gotten out of the way? It turns out that the actual act of floating has to do with pressure rather than weight. If you take a column of water one inch square and a foot tall, it weighs about 0.44 pounds depending on the temperature of the water (If you take a column of water one cm square by a meter tall, it weights about 100 grams). That means that a foot-high column of water exerts 0.44 PSI (Pounds per Square Inch). Similarly a meter high column of water exerts 9,800 Pascals. If you were to submerge a box with a pressure gauge attached into water, then the pressure gauge would measure the pressure of the water at the submerged depth: If you submerged the box into the water one foot, the gauge would read 0.44 PSI (if you submerged it one meter, it would read 9,800 Pa). What this means is that the bottom of the box has an upward force being applied to it by that pressure. So if the box is one foot square and it is submerged one foot, the bottom of the box is being pushed up by a water pressure of 12 inches * 12 inches * 0.44 PSI = 62 pounds (if the box is one meter square and submerged one meter deep, the upward force is 9,800 Newtons). This just happens to exactly equal the weight of the cubic foot or cubic meter of water that is displaced! It is this upward water pressure pushing on the bottom of the boat that is causing the boat to float. Each square inch (or square centimeter) of the boat that is underwater has water pressure pushing it upward, and this combined pressure floats the boat. © 1998 BYG Publishing, Inc. All rights
reserved.
|
||||||||||||||||||||||||||||||||||||||||||||||||
during a typical 7-day cruise of 1500 passengers
|
|
![]() |
© 1996-2012 Candy Brock
|