why does a hose shoot farther if you twist the nozzle?
398749
The pressure of the water going through the hose is increased by narrowing the hole from which it leaves.  So when the hole is small, there is more force pushing the water out of the hose, so it travels farther.\n\nIt's like a big bucket of water, where if there is a tiny hole near the bottom, a tiny stream shoots out for a good distance, but as the bucket empties, the stream shoots less and less far, because the weight of the water pushing it lessens as the water leaves the bucket.\n\nAnd, if the hole suddenly enlarges, the stream gets bigger but shoots out less far, because more volume is allowed into the stream so what pressure there is does not force the stream as far and the water in the bucket is lost sooner and so it loses pressure sooner....
786520
The muzzle velocity of the paint ball gun is higher. \nhttp://en.wikipedia.org/wiki/Muzzle_velocity
785122
If the thickness of the vessel wall is the same in both as well, then theorhetically you would get slightly  higher flow from the one 4mm vessel than the 2-2mm vessels since the one of the wall thicknesses is eliminated.
570511
both.  the friction, as well as creating its own heat, slows the airflow, which aggrivates the compression along the leading edges.\n\nI'm pretty sure.  don't put this on a physics test and then blame me.
893701
v(m/s) = Q(m3/s) / Nozzle Area(m2)
368950
It's the extreme pressure of the carbonation trying to force itself out of a small opening.  It's like when you hold your thumb over the end of a garden hose, it makes the spray harder because the pressure is backed up in the hose.  If you had a big enough opening, it wouldn't spew everywhere.
302337
You can bend the flow of water from the hose by swinging it on the air.\nIn fact you cannot bend its properties called H2O. \nYou cannot bend it either using your hand or vice grip.\n\nWater is not compressible either.\n\nHydrokinesis on only a fiction it could not be true.
68065
It's due to the rotation of the Earth - specifically the Coriolis Effect. See http://answers.yahoo.com/search/search_result?p=Coriolis+Effect\n\nMy answer assumes you have a circular toilet which drains right down the middle and recieves no directional impulse from the water flowing in ;-). ie. Under strict controlled conditions, you can make water spin in opposite directions as it drains through a hole.
591806
No, this is not perpetual motion, and the ball would not make it up the other side to come out again.\n\nThis is due to the fact that there is air resistance which would slow the ball down, even if it is very aerodynamic.  It would hit terminal velocity rather quickly, and not be able to accelerate any further.  So, in its trip back "up" the other side, it will not have nearly enough velocity to make it all the way up.\n\nThe friction with the air would eventually cause the ball to come to a stop, at a point roughly midway between the ends of the pipe (at the center of gravity).
999705
OK, a rotery vane pump consists of 2 concentric circles.  The circle in the center is spinning 'round and 'round and the space between the two circles is divided up into chambers.  The fluid enters one chamber that is rotating around and it gets transported to the other end of the pump.  This in itself is an OK design for a pump, but the inventor of the rotary pump had the genius to place the inner concentric circle just a bit off center so as the chamber nears the end of the pump, it gets smaller and smaller.  This increases the pressure on the fluid and gives it a little extra squirt.\n\nThe centrifucal pump is sorta like a fan.  The fluid enters the center of the pump (this pump is also a cylander) and there is a rotating fan of bars inside the pump.  As the bar rotates, centrifical force moves the fluid toward the outside of the pump and out of it.
405618
the tire pump valve fits so tight over the nozzle and combine with push air in keeps air from escaping. also, air wil;l not come out of a tire ( unless a leak) unless you twist the nozzle to make it come out
161441
As the water starts to circle, it is thrown to the outside, due to centrifugal force (to be more accurate, the force that it experiences is centripetal force=(mv^2)/r since centrifugal force is a so-called fictitious force). As it's thrown outside, it starts to move faster (when things move in a circle, the things that are nearer the outside move faster than things near the center; you can see this if you have a "old-fashioned" record player by putting two coins on it, one near the center and one near the outer edge and trace how long it takes them to complete the lengths of their paths). So the circling water near the outer rim is moving very fast and experiences bigger forces (since the force is proportional to velocity). But the water near the middle is moving slower because it's being dragged along the bottom and so ends up slowing down much more. Since the water near the bottom is moving so slowly, it exhibits a much lower centrifugal force and so there is little to no centrifugal force near the bottom (or middle). This is why you have a whirlpool (vortex): the water near the top is pushed out more (since there's higher centrifugal force there) and the water near the bottom is hardly pushed outward at all (since there's lower centrifugal force near the bottom to push it out).
969234
Definitely one or the other :-)\n\nMost rifles have a clockwise twist. There are, however, osme barrels that utilize a counterclockwise twist. Why, I'm not sure - it must be the preference of the barrel manufacturer.\n\nAs a long-range shooter, I can tell you that barrel twist does affect the exterior ballistics of the bullet. There is a phenomenon called spin drift that gradually pushes a bullet off-course - in the case of a right-hand-twist barrel, it moves the bullet to the right slightly. Not a concern, though, until you start shooting at distances of greater than 800 yards or so, where it can push your bullet about 2 inches off course.
59561
there is a hole in the end of the nozle.when that hole fall below the gas line, pump senses stop of air flow and stops pumping gas. (when you pump gas in you are also pushing air out.) Thats why if you pull the nozzle out some you can get more gas in. You are moving the hole above the gas line.
604112
I thing you are referring to surface tension pulling the water up the tube. The water can't be pulled past the end of the tube since there is no tube after that to pull on. In other words the water doesn't know the tube is too short until it gets to the end.
418087
This is very similar to the floating of a (slightly oily) needle on the water. Surface tension acts like a stretched elastic membrane. The water is always trying to minimize its free surface area (that is, surface that is not contacting and wetting some solid).\nWhen you put an unwettable object on the water it stretches the surface which increases the surface tension. This tension holds up the needle. When you push a tube with an unwettable inner surface into the water, the surface tension tries to minimize the unwetted surface area by not rising into the tube. It will reach a level in the tube that balances the bouyancy due to the immersed air with the surface tension.
394450
there are different type of pumps but basically the pump is rotated by motor. fuel flows into the pump and by pump's rotation, its outflow will have higher velocity.