Specifying the position of an object is essential in describing motion. In one dimension some typical ways are x(t) is used to represent position as a function of time. In two dimensions, either cartesian or polar coordinates may be used, and the use of unit vectors is common. A position vector r may be expressed in terms of the unit vectors.
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Audio-Video Connector. An audio-video connector allows the portable player to be hooked up to a television. This comes in handy at places like hotels where there may be a large TV, but no DVD player. This essentially allows people use the portable system as a regular DVD player. Battery Life. Since the main purpose of a portable DVD player is to allow people to be able to watch videos on the go or in remote places, battery life is very important. Lower cost players will only offer power for about two hours before having to be plugged in. Look for portable players that will last at least three and a half hours without a chord so that a full-length movie can be watched.