Two identical blocks, A and B, are initially at rest on a level, frictionless surface. At time t = t,, hands begin to push the blocks toward each other as shown at right. Each hand exerts a constant horizontal force of magnitude F. At time t = tz, each block has moved a distance d, from its initial position. Each hand pushes with a constant force of magnitude F A %3D A. During the interval from t, to tz: 1 = 1, 1. Is the work done on block A by the hand positive, negative, or zero? Explain. A B Kd, -d 2. Is the work done on block B by the hand positive, negative, or zero? Explain.

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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.