What makes a boomerang come back when it's thrown?
603653
When a boomerang is correctly thrown, it is given spin at the moment it is released from the throwers hand. Spinning the boomerang causes air to rapidly flow over the airfoils creating lift that makes the boomerang fly. Because the boomerang is moving forward through the air, in addition to spinning, the arm rotating into the direction of flight creates more lift than the arm rotating away from the direction of flight. This causes asymmetrical lift or in other words more lift on one side of the spinning boomerang than the other
32628
When you clap your hands, you compress the air between your palms.  That compression of air causes the load clap sound.  When a jet travels at extremely fast speeds, it compresses air in front of it and so causes the sonic boom.  The same goes with thunder.  When lightning strikes, the air around the lightning bolt is heated to very high temperatures and expands and pushes out at the surrounding air and this causes a compression against the surrounding air and you hear the violent thunder.
803160
If they are thrown with the same MAGNITUDE of velocity, and you are either not counting air resistance or are assuming that they all have the same drag parameters, then the MAGNITUDES of the final velocities will all be the same.  The actual velocities of the ones thrown up and down will be exactly the same while the one thrown horizontally will have a horizontal component an a lesser vertical component.  Still, all magnitudes will be the same.\n\nIf however, they are thrown at different speeds, then it will be the one that is thrown the hardest If you are counting air resistance and the balls have different drag parameters, then you have not provided enough info to tell.\n\nAnd if by final velocity you mean after they have come to rest on the ground, then obviously they all have a velocity of 0.  Typically this is not referred to as final though.
64326
boomerang \nfrom Dharuk\nThis word originated in Australia\n\nIt all comes back to you, doesn't it? That's the beauty of the boomerang, a hunting tool, weapon of war, and toy invented by resourceful aborigines in Australia. Invented long ago, too; a preserved boomerang recently recovered from Wyrie Swamp in South Australia dates back some 10,000 years, or 9,800 years before anyone spoke English in Australia. Just a simple crescent of wood, but it gets around.\n\nIn recent years, the boomerang has gone around the world, starting with the first international competition between Australia and the United States in 1981. Ten years later the World Boomerang Association was founded. There is a United States Boomerang Association and three dozen U.S. clubs. Competition events now include throwing for accuracy, distance, speed, and MTA or "maximum time aloft." A different kind of boomerang is used for each event. The record set by John "Air" Gorski for an MTA throw and catch is a full seventeen minutes. Materials come from around the world, too, the current favorite being aircraft-grade Finnish birch plywood. The 1998 world championships, held near St. Louis, Missouri, involved eighteen teams from a dozen countries on five continents. The next world championship was scheduled for Melbourne, Australia, in 2000.\n\nThe name boomerang comes from the Dharuk language, once spoken along the southeast coast of Australia, where Sydney now stands. The first English notation, in 1798, renders it as wom-ur-rang, but by 1827 it was the now-familiar boomerang.\n\nNowadays you will search in vain for a speaker of Dharuk. Even when Dharuk was spoken, there were few speakers of that language. But it was from the Dharuk that the English learned names for many of the exotic Australian creatures: dingo (1789), wallaby (1798), wombat (1798, not a bat, but a bearlike marsupial), koala (1803), wallaroo (1827); the kurrajong tree (1823); the corroboree (1811, a nighttime festival); and two kinds of weapon, the waddy (1790, a stick that doesn't come back when you throw it), and the boomerang.
633057
Back in WW2, SONAR was being used by ships in an attempt to locate them. SONAR (generally) works by sending out a sound that resembles a "ping" and then waiting for it to "bounce back." The bounce back was loudest on empty ships. You can imagine that the opponent would not waste time or ammunition sinking empty ships!!
582988
A right-handed boomerang circles towards the left, a left-handed boomerang circles towards the right. Most sport boomerangs are in the range of 2.5 to about 4 ounces. the range on most of these is between 25 - 40 yards (or meters) \nA right or left handed boomerang can be thrown with either hand, but the flight direction will depend upon the boomerang, not the thrower. \nGrasp one wing of the boomerang nearly vertically so that the other wing points forward and the flat side is away from you. The other way works also, but this way is usually easier to learn. Holding the tip by just the end between your thumb and one or two fingers, launch the boomerang forward quickly while trying more for spin than for very much force. \nThe boomerang should flatten out on its own and arc around, sometimes coming to rest a little in front of the thrower or behind the thrower, but ideally should hover in gently allowing the thrower to catch it as a sort of "boomerang sandwich" between the thrower's hands. \nOne should not throw a returning boomerang level, like a flying disc. The boomerang will turn in the direction of the top of its airfoils, so if that direction happens to be up rather than to the side it may fly high enough that the landing causes damage to the boomerang or whatever it lands on.
431791
when a meteoroid enters the atmosphere and burns up it produces a meteor.\n\nhttp://en.wikipedia.org/wiki/Meteor
1010543
Suppose you are taking a space walk near the space shuttle, and your safety line breaks. How would you get back to the shuttle? The thing to do would be to take one of the tools from your tool belt and throw it is hard as you can directly away from the shuttle. Then, with the help of Newton's second and third laws, you will accelerate back towards the shuttle. As you throw the tool, you push against it, causing it to accelerate. At the same time, by Newton's third law, the tool is pushing back against you in the opposite direction, which causes you to accelerate back towards the shuttle, as desired. This is the principle behind jet propulsion: a jet rocket expels fuel rapidly by ``pushing against it''. By the third law the fuel exerts an equal and opposite force against the rocket so the rocket accelerates in the opposite direction that the expelled fuel goes. Another example of the 3rd law is a book lying on a table. If the table were not there the book would fall under the force of gravity between the book and the earth. Why then doesn't the book move off the table, in accordance with the 2nd law? The table is exerting a force on the book that is just enough to cancel the gravitational force on the book. By Newton's third law, the book is also exerting an equal and opposite force on the table, and this is why the table feels the weight of the book. If the book were very heavy, its weight would cause the table to bend, or even break. This is illustrated in the following figure. \n\nThe answer to this question comes from the third law. Imagine the skateboard again. On the ground, the only part air plays in the motions of the rider and the skateboard is to slow them down. Moving through the air causes friction, or as scientists call it, drag. The surrounding air impedes the action-reaction. \n\nAs a result rockets actually work better in space than they do in air. As the exhaust gas leaves the rocket engine it must push away the surrounding air; this uses up some of the energy of the rocket. In space, the exhaust gases can escape freely.
845422
This is related to Newton's law: An object in motion or at rest will stay in motion or at rest unless acted upon by an external force.\n\nTo elaborate, an object travelling in a straight line will keep on travelling in that straight line at a constant speed unless something acts on it.\n\nWhen you are in the car with your ball, everything in the car is travelling at the same speed, so you through the ball up and it comes straight back down. But if you throw the ball up and then jam on the cars brakes, the ball will keep moving at its original speed but the car is slowing down, so the ball would fly forward into the front windshield.\n\nLast point, if you throw the ball out the window, it will appear to fly backwards - It is just slowing down compared to the car because unlike the air inside the car, the air outside is at rest, so the ball will be flying through the air at a high speed and the wind drag will slow it quite rapidly.
62656
When it hits something.
493573
Well I'm not sure but I think its called a dead ball and you have to re-bowl that ball. Or your just lucky and you got 4 runs out of it.
1072715
large altitude doesn't nesaserily mean that the projectile will spen more time in the air. \nif something is thrown off of a cliff, there is a high altitude but the projectile will just go down. \nif you were at the bottom of the same cliff and threw something up with enough force so that the max hieght is the same as the cliff, this projectile will spend double the time in the air as the first projectile.
675594
this is called "throwing the ball around the horn".\nit's meant to be rejuvinating for the players in the field.\nit only happens when there are no runners on base.\nwhen the pitcher is doing well and striking out lots of batters, the fielders have a tendency to get bored, even tired faster.  so the catcher will throw the ball down to the third baseman (sometimes they throw the ball "around the horn" starting at first base) when there is a strikeout, and the third baseman throws it to the second baseman or the shortstop, depending on how that particular infield likes to do it.  if you pay close attention, you will notice that the first baseman is usually omitted from this ritual.\nwhen the infielders throw the ball "around the horn" after a strikeout, it only goes to one corner infielder and the two middle infielders.
1112924
Comes from space itself. Two particles just appear, a particle and its antiparticle counter part then they instantly annihilate each other returning that energy back to space.
545262
Im thinking the question is " Why do they roll around on the ground after being hit". I think you would roll around on the ground after being hit by something that is going at times 96 miles per hour...It hurts!
991785
The gravity force depends on the mass of the object. For gravitational force, rotation of an object doesn't matter, it will always pull to the centre of mass.\n\nRotational momentum can cause objects to be thrown off if the momentum causes a movement which exceeds escape velocity. Escape velocity depends on the mass centre.\n\nA spinning ball simply has a very low escape velocity. If you spun a ball so it rotates once every 24 hours, things probably wouldn't be thrown off, either.
380562
Newton's 3rd law states that for every action, there is an equal and opposite reaction.\nIf the bird pushes backward with some force, another force of equal magnitude will push the bird forward.  This is similar to how rockets work, the rocker engines push one way, the space craft accelerates the opposite way.\n\nAnother way of thinking of it is that momentum is always conserved.  If the bird exerts a force on the air backward, that air (which has mass) experiences a change in momentum.  In order for momentum to be conserved, another force needs to be exerted on the bird to accelerate it in the opposite direction.