1) A 2.5-kg bucket of water is attached to a 1.0-m rope. The bucket is swung in a circle with the rope at 10.0-m/s. a) What is the centripetal force that keeps the bucket moving in its circular path? b) What provides the centripetal force that keeps the bucket moving in its circular path? c) If the rope can hold 400-N of force, what is the maximum speed the bucket can move in its circular path? {Hint: Let the centripetal force be 400-N and solve for the speed.}

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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.