why do skuba divers enter rhe water backwards from a boat?
478446
The bottle on the back is a lot heavier and so sitting on the edge with the bottle facing outward is a lot easier and less strain on the diver. Having done it myself I can also say if you to go into the water as if you were diving in regularly you would become disorientated as you entered because the weight of the bottle would spin you around a bit. \n\nAlso as you go in via the correct method it is important to hold onto all of the other bits of equipment close to you (regulator, the 'octopus' oxygen surge and goggles) otherwise they may go everywhere and get tangled up adding to the watery confusion! Hope thats ok!
299081
START SLOW HITTIN THE WATER OFF A BOARD AT HIGH SPEED CAN BREAK YA
44588
My understanding is that air has mass - more pressure in a chamber would mean more air - therefore, moving mass (or pressure) from one portion of the sealed vessel to another would shift the mass, be it ever so slightly. This would not affect the bouancy of the vessel, but may change its orientation ever so slightly. Anogulous to being in a boat and moving from the front to the back - the back would drop slightly, and front would raise slightly. \n\nHowever, as stated, the buoyancy of the "entire" vessel would not be affected.
462904
Here's how it works:\n\nThe air and water serve two different functions - the air is what is compressed, and pushes the water out of the back end of the rocket.  The water, although basically incompressible, is what makes the rocket go.  Momentum is always conserved, so whatever momentum (mass times speed) the water gets going out the back is also imparted to the rocket in the opposite direction.  You can think of it as positive and negative added momentum, creating a net change of zero.  The rocket is usually a much lower mass than the water, so the speed it achieves in order to match the momentum is higher than that of the water.\n\nAfter the water and air are expelled from the rocket, gravity is the only remaining force; the rocket slows, reverses direction, and lands on the ground.
904572
The diving speed would be constantly changing. You will need to set up an integral and calculate the volume of crap coming out of the men at each moment... Also were they eating a high fiber diet or more of a liquid type diet. We need more info for a truly correct answer.\n\n\nI have always wanted to know if you are skydiving naked and you crap your pants will the crap float next to you or will it tend to float upward and possibly land on your head once you pull you rip cord?\n\n\n\n\nfunny how toilet humor never gets old!!! keep it up!
495810
Because they are full of air.  Buoyancy.
492027
Without a lifejacket, the boater will still most likely continue breathing, even if unconscience.  The body is trying to sink, but lungs filled with air will keep the body afloat.  If the person breathes in and his or her lungs fill with water, the person will definitely sink. However, after drowning, the gases in the blood stream accumulate, allowing the dead body to rise to the surface of the water.
166496
Sounds like some of the other naval terms like Backing down.\n would this maybe simply be a term for a manuver on the water.
718005
Mainly their thick outer layer of blubber is able to absorb a lot of the pressure.  Their immense size does help even it out.  Unfortunately, even though they are built to be able to dive that deeply, it's not a harmless thing.  Whales do get the bends.  Often whale bones, especially those of sperm whales, show signs of nitrogen bubbles in the blood and tissues.  Over time it does cause them pain and in some rare cases some deformity.  So they're designed to be able to do it, but it is not risk-free to the whale.  There is a biological cost.
493630
This happens to novices because I think they're not equalizing properly.  Too much force probably.  You're using more force because you're stressed and not relaxing.  There may be other reasons but try to relax and equalize gently and frequently - BEFORE you feel a squeeze.  This also happened to me occasionally when I started diving.\n***\nWith sharks I wouldn't say you have NOTHING to worry about. You can dive in high risk areas and increase the chance of a confrontation, but general recreational diving doesn't carry a risk of shark attack.
694162
nothing, the air is probably underneath the fluid and the position change will reverse that allowing the air to escape.
775138
I’ve never seen this.  When I swim I take a breath just before turning, exhale while doing a flip turn and then breath the next stroke.  You have to exhale while doing the flip turn otherwise water will go up your nose, very uncomfortable.
961710
The boat rises as the water rises. It will never reach the rings. bob h spelled "near" wrong.\nSpud55 Didn't answer.\nTim assumed the boat was already afloat therefor the water might come closer that 7 ft to the ladder.\nWil t said "bob k" instead of "bob h"\niron duke insulted you\nI should get the 10 points ( not to mention that I am your husband)
864788
The 'Ballast' tanks are 'flooded' with either sea water, or 'blown' with compressed air, from reserve tanks.  Once the submarine has achieved 'neutral bouyancy' (neither sinking nor rising) then the the forward motion of the sub forces water over the control surfaces (elavators to rise & fall) and rudder (Yaw).  Thus the sub is 'flown' under water, in a similar fasion to an aircraft.
79520
Yes it is you have to do laps and make sure your doing them right. I'm a diver and I do laps all the time backward,sidewards,frontwards,and underneath are the best. Also if your not afraid of the diving board do a few jumpslike frontwards,backwards,fronttucks,and backtucks those are the simple ones. Hope this advise works.
255563
Dead things often end up on their backs because that is the equilibrium position with their center of gravity lowest to the ground. Dead fish float upside down because that places their center of gravity nearest the surface. Either way, the energy of the system is minimized. SUVs easily tip over for the same reason - too high a center of gravity
1144865
Underwater cave diving