does a bullet fly slow or fast in space?
402349
Normally you can't fire a bullet in space. Theres no air to burn with the powder.\n\nAssuming you do though, theres nothing to slow the bullet down, it would travel the same speed as it did on earth, and actually further as there is no friction or gravity to slow it down.
1151411
Objects of different mass do fall at the same speed, but air resistance hinders this fact.  For example, if you drop a bowling ball and a feather at the same time on the Earth, obviously the bowling ball falls faster. \n\nHowever, on the moon, when the astronauts dropped a feather and a bowling ball, they hit the ground at the same time. \n\nIt would seem that the bowling ball should fall faster since gravity is pulling on it with more force. But, with the more mass, comes more inertia, which meas it resists being pulled more than the feather. So, the feather is pulled less, but it resists less as well, so because of that, they will fall at the same time. The relationship between the force of pull and the object's inertial compensates exactly so that all objects fall at the same rate.
486904
If you mean a gun then the recoil is due to the rapidly expanding gasses that propel the projectile forward.  this obeys newtons first law for every action there is an equal but opposite reaction.  Because the gas expands in all directions it exerts a force on the gun and the bullet equally the bullet moves because te force acting on it is greater than the force needed to move the bullet. the gun doesn't move as much because the force required to move it is greater.
6491
11.3 Km/sec at earth's surface (7 miles/sec)\n\nNOTE that escape velocity is the speed with which you would throw an object so that it does not fall back to earth. Rockets for example have constant propulsion and therefore do not need to travel with escape velocity to go into space.
950828
Gravity only "slows" the bullet during 1/2 of its total trip, during the other half, gravity accelerates the bullet.\n\nAs the bullet rises into the air its velocity is continually decreasing as the force of its own weight (force due to gravity) as well as the force of air resistance, act to accelerate it downward.  At some point the bullet will come to a stop and then begin falling.  Afterward, gravity acts to increase the bullet's speed while the air resistance works in the opposite direction.  The magnitude of the force of air resistance depends on the speed of the bullet (the faster it does, the harder the air pushes back on it).  Eventually, the bullet will reach what is known as the "terminal velocity", where the force of gravity equals the force of air resistance, and the bullet stops accelerating (net force = 0).\nThe terminal velocity for an object depends on several factors including the object's mass and shape, as well as the density of the fluid it is moving through.  The terminal velocity for a bullet is lower than the speed at which it comes out of the gun in most cases, so the bullet will never be traveling as fast as it was while leaving the barrel when it hits the ground...but still, I would still not want it to hit me.
1016707
there is friction in space as said before but it is also because there is matter in space, just not very much, and eventually it would cause the object to stpo spinning
30409
Reentry burn is when engines are fired to slow a spacecraft to allow it to begin dropping towards the planet it will land on. Spacecraft stay in orbit due to a balance of forces; the forward speed and falling speed keep the craft above the planet (what's known as "orbital velocity"; different for each planet due to gravity of each planet). However, if the craft is slowed down, it will begin to fall towards the planet. On older capsules, there used to be "retro-rockets" for this purpose in a small package on the heat shield, but most ships in use today (Russian Soyuz, American Shuttle) use a main engine or maneuvering engine to slow the ship down. When landing on Earth, the ship must then "reenter" the atmosphere, which provides further braking action, and then deploy parachutes or use flying maneuvers to slow down to landing speed.
328500
Depends on the weapon and the bullet. A 5.56mm round fired from an M-16 exits the barrel traveling at about 2,900 feet per second. At ranges under about a hundred meters, the bullet is traveling fast enough that it fragments on impact, which opens up a huge wound cavity. But at ranges greater than that, the bullet slows down to the point where instead of breaking up, it retains it's integrity and gets deflected by bones, muscle, and various other tissues that can change it's trajectory. Heavier rounds, such as the 7.62x39mm (AK round), or the 7.62mm NATO are less effected by tissue and bone and usually continue their course in a straight line.
18207
You have the right idea, but you actually can fire a gun in space. What causes a gun to fire is actually the sudden impulse delivered by the trigger to the gunpowder causing the gun powder to explode, transferring a lot of energy to the bullet and causing it to shoot out of the barrel of the gun. In order to trigger the explosion of the gun powder, you do need an oxidizer to initiate the chemical reaction, but most gun ammunition comes with its own oxidizer built in so therefore, the gun can fire even without oxygen.  \n\nHowever, you shouldn't believe anything physics-related you see in movies,  What's funny is those huge explosions that happen all the time win movies in space with no oxygen like in star wars and armegeddon.  That definately could not happen.  Being a physics major has ruined my appreciation for movies really, I can't watch one without picking out all of the physics mistakes--and there are a LOT, and not just in space movies.  They should employ a physicist to stand by and tell them what they screw up.  Actually, I wish they did, that would be an awesome job haha.
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.
851042
Weight of the bullet..IE. grain  how far it'll travel @ what velocity
757769
Here's how to solve this.\nThe velocity is a vector, and right-angle components of velocity operate independently.\nThe bullet is fired with 2000 ft/s horizontal velocity but zero vertical velocity. So you know the horizontal and vertical components of velocity at the instant the bullet leaves the barrel.\n\nHowever, once it leaves the gun's barrel, the bullet experiences no horizontal forces, but vertically it is acted upon by gravity.\n\nSo: 1) how long does it take for the bullet to fall 5 ft, starting with zero vertical velocity? (hint: s = 1/2 a t^2\n\n2) Once you figure out how long until the bullet hits the ground, then figure out how far the bullet has travelled horizontally during that time, given 2000 m/s initial horizontal velocity and no horizontal forces.\n\nDoes this help?
661933
The thrust of rocket engines are how ships are controlled in space.  Many of the forces that affect air ships (drag, lift, gravity) do not apply since you specified no air or gravity.\n\nTechnically, air ships don't go to space, so there's no real answer to this question.  Richard Branson's Space Ship One recently flew to the edge of space and then landed like a plane, but (as the name indicates) it was a space ship, not an air ship.\n\nAnd there are air and gravity in space.  Gravity holds galaxies, separated by millions of light years, together, so gravity will definitely act on space ships only 100 or 200 miles above the earth.  What causes weightlessness in orbit is not a lack of gravity, but free fall.  The atmoshere is very, very thin at the altitudes where satellites and the shuttle fly, but it is that thin air, causing frictional drag on satellites and the space station, that require constant reboosting to keep them in orbit.\n\nKey to effective flight and control is stabilization, so in addition to moving and turning a ship in space, thrusters also are used to keep it from spinning (reaction wheels also are used for this function).
1023177
It's more or less as most of the preceding answers say. But it applies to escape from any body, not just earth and not just planets. For instance, the sun also has an associated escape velocity (617.2 km/sec at the surface). And it applies to a launch in any direction away from the body, not only vertical. As the 4th answer says, escape velocity decreases with distance from the body. Interestingly, because of conservation of energy, the velocity of an object launched at escape velocity remains equal to the escape velocity that prevails at whatever distance it reaches.\nA rocket achieves escape velocity by expelling the exhaust of its burning propellant rearwards at high velocity. It is most practically done by launching along a path that is initially vertical to minimize time spent in the dense atmosphere and consequent energy loss to air resistance, and then gradually changing to a more horizontal path to minimize the loss due to gravitational acceleration. Ignoring these loss factors, the velocity of a rocket is described by the "rocket equation", \nDeltaV = Vex * log(M0/M1), \nWhere DeltaV is velocity change, Vex is exhaust velocity, M0 is liftoff mass and M1 is burnout mass.
145197
Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. Ballistic Coefficient is essentially a measure of air drag. The higher the number the less drag, and the more efficiently the bullet cuts through the air. So for purposes of flying through the air efficiently, the bigger the BC number the better.\n\nBC is what determines trajectory and wind drift, other factors (velocity among them) being equal. BC changes with the shape of the bullet and the speed at which the bullet is traveling, while sectional density does not. Spitzer, which means pointed, is a more efficient shape than a round nose or a flat point. At the other end of the bullet, a boat tail (or tapered heel) reduces drag compared to a flat base. Both increase the BC of a bullet.\n\nFor example, a Hornady 100 grain round nose 6mm bullet has a BC of .216; a Hornady 100 grain spire point 6mm bullet has a BC of .357, and a Hornady 100 grain boat tail spire point 6mm bullet has a BC of .400. All three of these bullets have a sectional density (which is the ratio of a bullet's diameter to its weight) of .242, because they are all .243" in diameter and weigh 100 grains. But the more streamlined bullets have a higher ballistic coefficient. They are the ones to choose for long range shooting where a flatter trajectory is important.\n\nTo illustrate the practical difference between these three styles of bullets, let's use Hornady's trajectory figures for the 100 grain 6mm bullets above. Starting all three bullets at a muzzle velocity of 3100 fps from a scoped 6mm rifle zeroed at 300 yards, the trajectories are as follows.\n\n.243" 100 grain Round Nose (BC .216): -1.5" @ muzzle, +4.8" @ 100 yards, +6" @ 200 yards, 0 at 300 yards, -15.9" @ 400 yards, -46" @ 500 yards.\n\n.243" 100 grain Spire Point (BC .357): -1.5" @ muzzle, +3.8" @ 100 yards, +4.7" @ 200 yards, 0 @ 300 yards, -11.1" @ 400 yards, -30.5" @ 500 yards.\n\n.243" 100 grain Spire Point BT (BC .400): -1.5" @ muzzle, +3.6" @ 100 yards, +4.4" @ 200 yards, 0 @ 300 yards, -10.4" @ 400 yards, -28.6" @ 500 yards.
1127089
If time was stopped, and forces like gravity didn't pull the bullet to the ground, it should be sitting there in mid air and you would be able to touch it.\n\nIt would probably be very hot from the friction from the air and firing it.
971235
Depends on your momentum when you do so.\n\nIf you're utterly still and blow out air in space, you will move backwards.\n\nWell, your frozen corpse will...