9. A 74.0–g block carrying a charge Q=35.0 µC is connected to a spring for which k= 78.0 N/m. The block lies on a frictionless, horizontal surface ww and is immersed in a uniform electric field of magnitude E=4.86 × 10ʻN/ C directed as shown in figure. If the block is released from rest when the x=0 spring is unstretched (r= 0), (a) by what maximum distance does the block move from its initial position? (b) Find the subsequent equilibrium position of the block and the amplitude of its motion. (c) Using conservation of energy, find a symbolic relationship giving the potential difference between its initial position and the point of maximum extension in terms of the spring constant k, the amplitude A, and the charge Q.

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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.