(27) Two wave pulses, Pulse X and Pulse Y, are created at opposite ends of a horizontal string and are moving toward each other, both as speed of 3.0 centimeters per second. The horizontal positions along the string are shown. The position of the pulses at time t = 0.0 seconds is shown in the figure below. 13 cm/s 1 2 3 4 5 6 7 8 9 10 cm 3 cm/s Y Which of the following figures most accurately depicts the shape of the string at time t= 1.0 seconds? (A) ó 1 2 3 4 5 6 7 8 9 10 cm (B) 0 1 2 3 5 6 7 8 9 10 cm (C) 5 5 6 7 8 9 10 0 1 2 3 cm (D), 0 1 2 3 4 5 6 7 8 9 10 cm

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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.