?iPod is able to deliver extremely rich quality of digital music. ?It comes in attractive small sizes and thus tends to be very handy and compact. ?They come with in-built media library software, called as the iTunes media library software. This feature enables the user to manage the music files efficiently. ?The most attractive feature which made iPod the best seller is the attribute which allows the device to be connected to the user's computer. ?Thus by enabling connection with the user's computer, the iPod prove to serve as efficient storage devices. ?iPods sport a display, which makes the gadget more user friendly. ?Improvised iPods also had PDA's( Personal Digital Assitants). ?Apple, the creators of iPod kept on improvising it, and thus many models of iPod have rocked the market.
The models of iPod categorized according to the chronological order.
First Generation iPods:
Initially the iPods were released with 5GB hard drive, but then later Apple increased their hard drive capacity to 10GB. These iPods have a scroll wheel with a select button in the middle. This device was a huge hit in the commercial market, but now they rarely exist due to the release of new models.
Second generation iPods:
These devices had a thicker body and they supported 20 GB hard drive. They were the first gadgets, which were compatible with the windows. They also sported cases and wired remotes.
Third generation iPods:
These iPods were thinner than the original versions, the 30 pin dock connector was introduced with this series. They also had touch sensitive buttons this attracted the masses to a great extent. And it did not have buttons surrounding the wheels and hanging parts.
Fourth generation iPods:
The only difference, the fourth generation iPods had over the others is the introduction of click wheels. They also sported the same monochrome screen. But it enabled the battery to be charged through the USB connection.
Color iPods:
As the name suggests these devices had a color screen and the ability to store and display JPEG, BMP, GIF, TIFF, and PNG images. They supported 65,536 colors. They possessed the photo library and released accessories like iPod camera connector.
Fifth generation iPods:
They were developed to reduce minor audio effects so that the head phone does not deliver hard drive noise. They came in a wide variety of sizes, colors and hard drive capacities. They also supported features like the World Clock, Stopwatch, and Screen Lock applications. In addition, the earphones plug were smaller.
iPod mini:
The mini had a smaller structure and it resembled the earlier versions in its features. but it did not support third party accessories. They introduced micro-drive hard drive as the storage medium. The minis were futher improvised as the first generation and second generation devices. It had rich case colors and was a big hit in the market.
iPod shuffle:
Flash memory was introduced through these gadgets, but they did not have a screen so navigation of music files were a little difficult. But it has been reviewed as the best sounding audio device in comparison with the other models.
iPod nano:
iPod nano also had the flash memory but it came with a color display. It also included a number of features like world clock, stop watch and screen lock options.
From the very ancient times dating back to the ancient Greek civilization, man has been constantly on the lookout of tools that could reduce the amount of effort required to carry out operations such as pushing, pulling and lifting heavy objects. Traditionally, machines have been divided into two categories: simple and complex.
Simple machines are tools that make work easier. They have few or no moving parts. These machines use energy to work.
There are only six simple machines: the lever, pulley, wheel and axle, inclined plane, wedge, and screw. Complex machines, on the other hand, are made up of several simple machines, and are used to perform complex tasks that are not possible to do by humans. For instance, a crane is a complex machine using the many simple machines like the pulley and lever (the arm of the crane), and is used to lift very heavy objects.
As mentioned before, levers are simple machines. A lever is a board or bar that rests on a turning point. This turning point is called the fulcrum. An object that a lever moves is called the load. The closer the object is to the fulcrum, the easier it is to move.
Now, all of us have loved playing on a see-saw swing with our friends or siblings, but did you ever think that a see saw is nothing but a simple lever? A see-saw (or teeter-totter) is a plank of wood, the center of which is hinged on to a bar - the fulcrum. It moves up or down around this rod.
While playing on it, you would have noticed that the heavier person between you and your friend was pushed down as you rose up in the air. Moreover, by applying a little force on the see-saw, you were able to lift a heavier person, thus greatly reducing the amount of effort required to lift the heavier person. To realize the difference in the effort required, try to lift your friend in the air by grabbing him physically.
Another example of a lever is a bottle opener. As you would have seen, it is extremely tough to open a glass soda bottle by hand. By using a bottle opener, we are magnifying the force applied and thus reducing the effort required to do the job.
A similar example can be seen in the form of a hammer which is used to pull a nail out of the wooden block.
Levers are divided into three classes, depending on the location of the fulcrum. A first-class lever is a lever in which the fulcrum is located between the input effort and the output load. Example: see-saw, hammer's claw etc.
In a second class lever the input effort is located at one end of the bar and the fulcrum is located at the other end of the bar, opposite to the input, with the output load at a point between these two forces. Example: Door knob, wrench (used by plumbers and mechanics).
In third class levers, effort is applied between the output load on one end and the fulcrum on the opposite end. Example: Baseball bat, broomstick, etc.
In the modern world we use levers all the time, and usually don't even realize how much easier this simple machine makes our lives.
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