Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Projectile shopping experience:
1. Compare - without doubt the biggest advantage that the Projectile offers shoppers today is the ability to compare thousands of Projectile at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Projectile? Wrong! If the Projectile is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Projectile then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Projectile? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Projectile and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Projectile wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Projectile then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Projectile site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Projectile, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Projectile, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
A
projectile is any object propelled through space by the exertion of a force. In a general sense, even a Football (ball) or baseball may be considered a projectile. It can cause damage (injury,
property damage) to a person, animal or object it hits, depending on factors including size, shape,
speed and hardness. Accordingly, in practice most projectiles are designed as weapons.
Motive force
Arrows,
dart (missile), spears, and similar weapons are fired using pure mechanical force applied by another solid object; conversely, other weapons use the compression or expansion of gases as their motive force.
Blowguns and pneumatic rifles use compressed gases, while most other
guns and firearms utilize expanding gases liberated by sudden chemical reactions. Light gas guns use a combination of these mechanisms.
Railguns utilize electromagnetic fields to provide a constant acceleration along the entire length of the device, greatly increasing the
muzzle velocity.
Some projectiles provide propulsion during (part of) the flight by means of a rocket engine or
jet engine. In military terminology, a
rocket is unguided, while a missile is guided missile. Note the two meanings of "rocket": an ICBM is a missile with rocket engines.
Kinetic projectiles
Some projectiles do
not contain an explosive charge (such as Shell (projectile)s). They are termed
kinetic projectile,
kinetic energy weapon or
kinetic penetrator. The classic kinetic energy weapon is the
bullet. Among projectiles which do not contain explosives are
railguns,
coilguns,
mass drivers, and kinetic energy penetrators, in addition to smaller weapons such as bullets. All of these weapons work by attaining a high
muzzle velocity (
hypervelocity), and
collision with their objective, releasing
kinetic energy.
Some kinetic weapons for targeting objects in spaceflight are
anti-satellite weapons and anti-ballistic missiles. Since they need to attain a high velocity anyway, they can destroy their target with their released kinetic energy alone; explosives are not necessary. Compare the energy of
trinitrotoluene, 4.6 MJ/kg, to the energy of a kinetic kill vehicle with a closing speed of 10 km/s, which is 50 MJ/kg. This saves costly weight and there is no
detonation to be done at the right time, but on the other hand it requires a more accurate hit.
With regard to anti-missile weapons, the Arrow missile and MIM-104 Patriot have explosives, but the KEI, LEAP, and
THAAD being developed do not (see
Missile Defense Agency).
See also
Terminal ballistics#Hypervelocity terminal ballistics,
Exoatmospheric Kill Vehicle (EKV).
A kinetic projectile can be dropped from aircraft. This is applied by replacing the explosives of a regular bomb e.g. by concrete, for a precision hit with less
collateral damage. A typical bomb has a mass of 900 kg and a speed of impact of 800 km/h (220 m/s). It is also applied for training the act of dropping a bomb with explosives. This method has been used in
Operation Iraqi Freedom and the subsequent military operations in Iraq by mating concrete-filled training bombs with JDAM GPS guidance kits, to attack vehicles and other relatively "soft" targets located too close to civilian structures for the use of conventional high explosive bombs.
A kinetic bombardment may involve a projectile dropped from Earth orbit. For a fictional kinetic weapon, see
Relativistic kill vehicle.
See also
ASM-135 ASAT.
Typical projectile speeds
{| class="wikitable"! Projectile || Speed (m/s) ] 1 m || 4.43 m/s || 14.5 ft/s || 9.9 mph|-| object falling 10 m || 14 m/s || 46 ft/s || 31 mph|-| thrown
club (weapon) (expert thrower) ] dart (expert thrower) || 45 m/s || 150 ft/s || 100 mph|-| 80-lb-draw pistol
crossbow bolt ] fired from marker || 91 m/s || 300 ft/s || 204 mph|-| 175-lb-draw crossbow bolt ]
pellet 6 mm
BB gun || 100 m/s || 328 ft/s || 224 mph|-| rifle bullet 4.5 mm ] pellet (conventional maximum) ]) || 340 m/s || 1116 ft/s || 761 mph|-| 12.7x99 mm (bullet of a heavy
machine gun) ] (standard bullet used in many assault rifles) || 920 m/s || 3018 ft/s || 2058 mph|-| 125x1400 mm (shell of a
tank) ]
reentry vehicle ] || up to 7 km/s || ~23000 ft/s || ~16000 mph|-| Exoatmospheric Kill Vehicle ]) and target both in Low Earth orbit || closing speed 0 - 16 km/s || ~53000 ft/s || ~36000 mph|}
See also Orders of magnitude (speed),
Muzzle velocity.
Miscellaneous
Ballistics analyze the projectile
trajectory, the forces acting upon the projectile, and the impact that a projectile has on a target. A guided missile is not called a projectile.
An explosion, whether or not by a weapon, causes the debris to act as multiple high velocity projectiles. An explosive weapon, or device may also be designed to produce many high velocity projectiles by the break-up of its casing, these are correctly termed Fragmentation (weaponry).
The term projectile also refers to weapons or any other objects thrown, shot or otherwise directed to enemies in video games or computer games.
See also
External Links
Projectile Motion Applet
A
projectile is any object propelled through space by the exertion of a force. In a general sense, even a Football (ball) or
baseball may be considered a projectile. It can cause damage (injury, property damage) to a person, animal or object it hits, depending on factors including
size, shape, speed and
hardness. Accordingly, in practice most projectiles are designed as weapons.
Motive force
Arrows,
dart (missile), spears, and similar weapons are fired using pure mechanical force applied by another solid object; conversely, other weapons use the compression or expansion of gases as their motive force.
Blowguns and
pneumatic rifles use compressed gases, while most other
guns and
firearms utilize expanding gases liberated by sudden chemical reactions. Light gas guns use a combination of these mechanisms.
Railguns utilize electromagnetic fields to provide a constant acceleration along the entire length of the device, greatly increasing the
muzzle velocity.
Some projectiles provide propulsion during (part of) the flight by means of a rocket engine or
jet engine. In military terminology, a
rocket is unguided, while a missile is guided missile. Note the two meanings of "rocket": an
ICBM is a missile with rocket engines.
Kinetic projectiles
Some projectiles do
not contain an explosive charge (such as
Shell (projectile)s). They are termed
kinetic projectile,
kinetic energy weapon or
kinetic penetrator. The classic kinetic energy weapon is the
bullet. Among projectiles which do not contain explosives are
railguns, coilguns,
mass drivers, and
kinetic energy penetrators, in addition to smaller weapons such as bullets. All of these weapons work by attaining a high muzzle velocity (hypervelocity), and
collision with their objective, releasing
kinetic energy.
Some kinetic weapons for targeting objects in
spaceflight are
anti-satellite weapons and
anti-ballistic missiles. Since they need to attain a high velocity anyway, they can destroy their target with their released kinetic energy alone; explosives are not necessary. Compare the energy of
trinitrotoluene, 4.6 MJ/kg, to the energy of a kinetic kill vehicle with a closing speed of 10 km/s, which is 50 MJ/kg. This saves costly weight and there is no detonation to be done at the right time, but on the other hand it requires a more accurate hit.
With regard to anti-missile weapons, the Arrow missile and
MIM-104 Patriot have explosives, but the KEI, LEAP, and THAAD being developed do not (see Missile Defense Agency).
See also
Terminal ballistics#Hypervelocity terminal ballistics,
Exoatmospheric Kill Vehicle (EKV).
A kinetic projectile can be dropped from aircraft. This is applied by replacing the explosives of a regular bomb e.g. by concrete, for a precision hit with less collateral damage. A typical bomb has a mass of 900 kg and a speed of impact of 800 km/h (220 m/s). It is also applied for training the act of dropping a bomb with explosives. This method has been used in
Operation Iraqi Freedom and the subsequent military operations in Iraq by mating concrete-filled training bombs with JDAM
GPS guidance kits, to attack vehicles and other relatively "soft" targets located too close to civilian structures for the use of conventional
high explosive bombs.
A
kinetic bombardment may involve a projectile dropped from Earth orbit. For a fictional kinetic weapon, see Relativistic kill vehicle.
See also ASM-135 ASAT.
Typical projectile speeds
{| class="wikitable"! Projectile ||
Speed (m/s) ] 1 m || 4.43 m/s || 14.5 ft/s || 9.9 mph|-| object falling 10 m || 14 m/s || 46 ft/s || 31 mph|-| thrown
club (weapon) (expert thrower) ] dart (expert thrower) || 45 m/s || 150 ft/s || 100 mph|-| 80-lb-draw pistol
crossbow bolt ] fired from marker || 91 m/s || 300 ft/s || 204 mph|-| 175-lb-draw crossbow bolt ] pellet 6 mm BB gun || 100 m/s || 328 ft/s || 224 mph|-|
rifle bullet 4.5 mm ] pellet (conventional maximum) ]) || 340 m/s || 1116 ft/s || 761 mph|-| 12.7x99 mm (bullet of a heavy
machine gun) ] (standard bullet used in many assault rifles) || 920 m/s || 3018 ft/s || 2058 mph|-| 125x1400 mm (shell of a
tank) ] reentry vehicle ] || up to 7 km/s || ~23000 ft/s || ~16000 mph|-|
Exoatmospheric Kill Vehicle ]) and target both in Low Earth orbit || closing speed 0 - 16 km/s || ~53000 ft/s || ~36000 mph|}
See also
Orders of magnitude (speed), Muzzle velocity.
Miscellaneous
Ballistics analyze the projectile trajectory, the forces acting upon the projectile, and the impact that a projectile has on a target. A guided missile is not called a projectile.
An explosion, whether or not by a weapon, causes the debris to act as multiple high velocity projectiles. An explosive weapon, or device may also be designed to produce many high velocity projectiles by the break-up of its casing, these are correctly termed
Fragmentation (weaponry).
The term projectile also refers to weapons or any other objects thrown, shot or otherwise directed to enemies in video games or computer games.
See also
External Links
Projectile Motion Applet
Projectile
Monster makes traps if you leave the room, can also rshot to the adjacent room
Projectile - Wikipedia, the free encyclopedia
A projectile is any object propelled through space by the exertion of a force, which ceases after launch. In a general sense, even a football or baseball may be considered a ...
Definition: projectile from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
Definition: projectile vomiting from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
projectile
Projectile 2008 - Newcastle-Upon-Tyne — Site
Irrepressible and unstoppable, Projectile returns for the 4th annual festival of anarchist film, culture and politics. As a revolutionary bonus, Projectile 2008 will run for four ...
SourceForge.net: Projectile
The world's largest development and download repository of Open Source code and applications ... Projectile motion is a GUI based program that calculates various parameters of ...
Projectile motion
Java applet: Projectile motion ... This Java applet shows the motion of a projectile. The "Reset" button brings the projectile to its initial position.
projectile
projectile
projectile - Hutchinson encyclopedia article about projectile
Hutchinson encyclopedia article about projectile. projectile. Information about projectile in the Hutchinson encyclopedia. projectile points
