9. A steel guitar wire is 65.0 cm long and hås a of 12.5 g. Its ends are fixed to two points so that it is taut and it is then plucked in the middle. If the tension in the wire is 200.0 N, then the frequency in Hz of the second harmonic of the wire is: A 78.4 B 157 C 102 204 D

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.