Archive For The “General Science” Category

Surface Tension

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Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid. Its unit is Newton per Metre. Contents Understanding Surface Tension Adhesive and Cohesive Forces How Surface Tension works? Capillary Action Applications of Capillary Action in daily life…

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Sun-synchronous orbit

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Sun-synchronous orbit or a heliosynchronous orbit very important because of its particular importance to satellites intended for remote sensing and military applications. A sun-synchronous orbit is one that lies in a plane that maintains a fixed angle with respect to the Earth-sun direction. In other words, it combines altitude and inclination in such a way…

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Polar Orbits

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The Polar Orbit is not much suitable for communication purposes because it moves in a different direction than that of direction of earth’s rotation. So, the use of Polar satellites depends upon their arrival at a particular point on earth at a particular point. The Polar orbits are used for special applications like navigational satellites….

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Low Earth Orbits

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A satellite can also be placed in Low Earth Orbits (about 1,000 kilometers above the Earth (between 400 miles and 1,600 miles)). However, satellites in LEO need a higher velocity than Geostationary orbits.  For example, a satellite which is placed in an orbit at altitude of 200 kilometers will need an orbital velocity of approximately…

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Geostationary and Geosynchronous Orbits

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The core principle of an orbit is that as a satellite or object moved tangentially, it falls toward the earth / other body, but it moved so quickly that earth / body will curve away beneath it. Thus we can understand that gravity pulls this object into a curved path as it attempts to fly…

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Artificial Satellite Basics

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Satellite refers to any project that is orbiting earth, sun or other planetary bodies. Satellites can be artificial or natural. The artificial satellites basically work on principle of projectiles. The only force that works on satellites is gravity. Once launched in an orbit, gravity is the only force governing the motion of the satellite. Contents…

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Kepler’s Laws of Planetary Motion & Newton’s Law of Gravitation

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In the early 1600s, Johannes Kepler proposed three laws of planetary motion as follows: Contents Kepler’s First law (Law of orbits) Second law (Law of areas) Third law (Law of periods) Newton’s universal law of gravitation Kepler’s First law (Law of orbits) Each planet moves around the sun in an elliptical orbit with the sun…

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Horizontal Projectile Motion: Physics Notes

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When an object is thrown from horizontal at an angle θ except 90°, then it will follow a trajectory and the motion is called projectile motion.  A horizontally thrown ball and a bullet fired from a rifle held horizontally are the examples of projectiles in the horizontal direction. For this type of projection there is…

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LAN, WAN & MANs

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A network consists of multiple computers connected using some type of interface, each having one or more interface devices. The primitive computers were the self contained devices in which the data was confined in it. The only way to transfer the data from one machine to another was to take the data in a storage…

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Bernoullia’s theorem

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When air is blown over the top of a sheet of paper, the paper rises in the air stream. This happens because the pressure falls above the paper where the air is moving faster. We take a table tennis ball and place in a funnel and hold it with the mouth sloping upwards. When we…

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Parts of a Computer

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All general-purpose computers has the following main hardware components. Memory: Memory enables the computers to store, at least temporarily, data and programs. Mass storage device: Allows a computer to permanently retain large amounts of data. Common classic mass storage devices include disk drives and tape drives. The latest being the Hard Disks and USB mass…

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