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A real time operating system has well defined fixed time constraints. Process must be done within the defined constraints or the system will fail. An example is the operating system for a flight control computer or an advanced jet airplane. Often used as a control device in a dedicated application such as controlling scientific experiments, medical imaging systems,industrial control system, and some display systems. Real-Time systems may be either hard or soft real-time. Hard real-time: Secondary storage limited or absent, data stored in short term memory, or read-only memory (ROM), Conflicts with time-sharing systems, not supported by general-purpose operating systems. Soft real-time: Limited utility in industrial control of robotics, Useful in applications (multimedia, virtual reality) requiring advanced operating-system features.

Understanding can be demonstrated in various ways. One way that understanding can be demonstrated is by explanation. For example, a student might explain the causes of the American Civil War by providing examples and explaining  the relationships between the cause and effects. understanding can also be demonstrated by application. for example, a student may be able to use his/her understanding of the physics of flight design a working  model of a glider plane.

You need to be a 'people person', as a warm and friendly attitude is expected at all times. Good communication skills are essential as our passengers range from corporate businessmen to housewives going on holiday, and each one has different needs and priorities. You also need to be security-conscious and assertive at all times. You need to be aware of everything that goes on in the plane. If there is a problem there will be no way to get support from the ground so the passengers' safety lies with you. When things go wrong you are expected to remain calm and come up with a solution.

Yes, I will.  When a gun barrel is manufactured for a handgun or rifle, a series of spiraling grooves is "cut" or machined into its interior surface.  These are put into the barrel in order to impart a spin to the bullet as it passes through the barrel. The spinning bullet has stability in flight and travels in an accurate manner.  The markings that are left on the bullet from the barrel rifling is what the forensic firearms examiner utilizes in determining whether two bullets were fired through the same gun barrel. 

As an example, a shooting case received in the forensic lab might have a fired bullet removed from a victim and a suspect weapon from a suspect. The question posed is whether the evidence bullet was fired from the suspect's weapon. An initial inspection of the bullet and weapon is performed to determine whether they match with respect to the same general specifications such as caliber, number and width of lands and grooves, and direction of twist. If they match with respect to these specifications, the firearms examiner will then test fire the weapon into a water tank or other catch box. The fired bullet is then recovered and is used as the "known" or test bullet from the suspect weapon.  The examiner next uses a piece of equipment called a comparison microscope that allows a split screen side by side view of two objects placed on its two separate microscope stages. The evidence bullet is placed on one one stage and the test bullet on the second stage. The examiner looking through the microscope and is able to see a side by side view of the rifling on the evidence and test bullets.  He looks around the entire circumferance of the two bullets to see whether there are matching barrel engraved rifling marks. If there are, the examiner can give the opinion that the two bullets were fired through the same gun barrel.

The Air Force focuses on these areas:

Aerospace Superiority: The ability to control what moves through air and space ensures freedom of action.

Information Superiority: The ability to control and exploit information to our nation's advantage ensures decision dominance.

Global Attack: The ability to engage adversary targets anywhere, anytime, holds any adversary at risk.

Precision Engagement: The ability to deliver desired effects with minimal risk and collateral damage, denies the enemy sanctuary.

Rapid Global Mobility: The ability to rapidly position forces anywhere in the world, ensures unprecedented responsiveness.

Agile Combat Support: The ability to sustain flexible and efficient combat operations is the foundation of success.

The Verdict: The Air Force is focused on flying. There are also plenty of other opportunities on land though. If you like flying and/or working with flight systems & technology, the Air Force is for you.

There should be atleast 1 flight attendent to every 50 passengers.