An Essay About Orbits Communications Essay

An Essay About Orbits Communications Essay The word orbit we hear it very often, whenever the space shuttle launched or it meets up ISS (International Space Station) or when a rocket launches a payload, we always come across the word ‘orbit’. But what actually the orbit is? An orbit is a specific path on which an artificial satellite revolves/travels around another body or planet .This path is regular and repeating .Satellite can be natural and artificial, like Moon .Moon itself acts like a satellite which travels around the Earth in a particular path. In the solar system , nine planets including Earth ,revolves around the sun in an orbit .Satellite that travels around the Earth are not in a constant distance from Earth, it varies .Sometimes its closer and sometimes far away. The closest orbit of satellite around the Earth is called â€Å"perigee† and farthest orbit called â€Å"apogee†. The time required for a satellite to complete full orbit is called a â€Å"period†. According to Isaac Newton’s first law of motion, a moving object will remain in motion unless something pulls it or push it, and that is gravity. Without Earth’s gravity, satellite would go off in the space along a straight path .With Earth’s gravity it keep on pulled satellite back to Earth. To maintain the orbit, the gravitational force and the momentum of moving object have to be balanced. Another factor is Escape velocity. It is the speed of an object (satellite) to break free from the gravity of the planet and enters into a certain orbit. It depends on the mass of the planet and varies from planets to planets and the distance from the centre of the planet to the object (satellite) is also important. The escape velocity of Earth is approx. 11.3 km (7 miles)/hr. Orbital Velocity: Orbital velocity is the required speed needed for an object (satellite) to stay in an orbit. It is about and altitude of 242 km, approx 17,000 miles /hr. [4] SATELLITE ORBITS There are three differ ent types of orbits High Earth orbit (Geostationary orbit), Medium Earth orbit (MEO), and Low Earth orbit (LEO).The orbit selected for satellite is depend on its usage and application. Direct Broadcast Programmes and weather communication satellites use Geostationary Orbit, as they are far away from the Earth and they travel in the Earth’s direction therefore looks stationary .Satellite navigation systems (NAVSTAR or GPS [global positioning system] ),designed to navigate a particular region or area and satellite phones are in MEO(Medium Earth Orbit). NASA’s Earth Observing System and other scientific satellites uses LEO (Lower Earth Orbit). [5] [6] Earth orbits. [7] ORBITAL DISTANCES [8] , [9] Orbits Orbit Initials Miles Km 1-way Delay Orbit altitude (KM above earth’s surface) Low Earth Orbit (LEO) 100-500 160 – 1,400 50ms 200 – 1200 Medium Earth Orbi t (MEO) 6,000 – 12,000 10-15,000 100ms 1200 – 35790 Geostationary Earth Orbit (GEO) ~22,300 36,000 250 ms 35790 Circular and Elliptical Paths There are two types of orbit paths, in which satellite travels around the Earth, circular and elliptical. In circular orbits, the distance between the earth and satellite remains same all the time. When a satellite orbit around the Earth, it creates a plane, which goes across the geo -centre or centre of gravity of Earth. If the satellite orbit with Earth’s rotation, it is called â€Å"posigrade† and if it is in opposite direction, it is â€Å"retrograde†.

Appraising Legal Concerns Research Paper Example | Topics and Well Written Essays - 1000 words

Appraising Legal Concerns - Research Paper Example Contract Law Contract law is the most fundamental governing law of any procurement project. It is because procurement projects commence after signing the legal contract. Managers must be completely aware of all legal obligations of a contract so they may not step out of line. A comprehensive definition of contract law is; â€Å"An agreement between two or more persons which creates an  obligation to do or not to do a particular thing. Its essentials are competent  parties, subject matter, a legal consideration, mutuality of agreement, and mutuality of obligation.† (Fleming, 2003) But more suitable definition of contract law (regarding procurement management) is; â€Å"A contract is a mutually binding agreement that obligates the seller  to provide the specified product and obligates the buyer to pay for  it† (Institute, 2000) However, most of procurement projects involve more than just mere buying and selling of goods and services. Procurement includes partnersh ips and joint ventures and they legally bind the participants to perform an action. That is why it is better to use the definition for contract law which has a broader perspective. Taking a deeper look into the broader definition, following ten points can be concluded; a. A contract is a promise between two or more people or two or more parties b. ... The other party that needs to accept the offer has to accept it unconditionally f. If the accepting party wants to make adjustments (modification) to the original offer, the original offer will become void and a new offer will be formed. This process can continue until there is an offer from one party and an unconditional acceptance of it by the other. g. Concurrency is obligatory; all parties to the contract must agree to the same exact terms. h. A contract becomes only legal when there is ‘consideration’ involved. Consideration is anything that has value and is offered in exchange of something (goods or service). Consideration doesn’t necessarily have to be of the same value. i. The purpose of a contract should be legal as illegal contracts have negligible value in the eyes of law. j. All contracts need to be in the proper legally acceptable format. This usually requires the contract to be in black and white form (on paper) and signed. Mostly real estate contrac ts and contracts of simple buying/selling are classic examples (Fleming, 2003). Agency law By the standards of this law, any agent that will be appointed by the company (principal) will hold the same position in the deciding about procuring goods as the CEO. In other words, the agent will be acting on behalf of the company. Whatever contract he will enter the company into, the company will be liable to abide by the rules and promises of that contract. In the Latin phrase, the relationship between agent and principal is described by the  phrase,  qui facit per alium, facit per se, i.e.  the one who acts through another, acts in his or her own interests (Wikipedia contributors, 2011). Regarding the matter at hand which

White Paper on the film Henry V Essay Example | Topics and Well Written Essays - 1000 words

White Paper on the film Henry V - Essay Example Setting a concrete example for this leadership is the leadership of Henry V during his term. Perhaps during his motivational rhetoric before he and his people went off to a battle what made his leadership notable. The content of his speech had a power to move or compel his member toward his vision. To scrutinize the content of his inspiring â€Å"St. Crispin† speech will help this study to understand Charismatic Leadership. Citing the reality of life and death in his speech, King Henry V’s St. Crispin’s speech appealed truthful. Thus it brought another dimension to view life, enough to motivate people to move in his direction. To have his people not to fear regarding their number, he made them realized that greater honor was waiting for the few people rather than the multitude. The share of honor in multitude will be a lesser credential than to a group of fewer people. Perhaps in his speech, King Henry V’s charisma was emphasized when he cited and imply about God’ will with his own vision and plans. This just signified humility on his part towards a more Greater Power than his own that he was acknowledging. In a study of trait of charismatic leadership done by Quarterman Lee (2008), he came up with certain descriptions to describe such kind of leaders. The descriptions will also served as categorical arrangement to analyze the context of King Henry V’s St. Crispian’s speech in this study. In order to present to people being governed a leader’s compelling vision, a certain means of transmission will be needed. Speech or rhetoric to address the people is one of those (Nelson, Megill, and McCloskey, 1987). King Henry V used a persuasive rhetoric in his St. Crispian’s Day speech. Apparently, after the speech were given, the cited expected effect of such act manifested towards King Henry V’s people. He declared that certain day to be the St. Crispian’s Day,