e of horizontal surface. (See the figure.) Crate A has mass m and crate B has mass mg. The coefficient of kinetic friction between each crate and the surface is . The crates are pulled to the Two crates connected by a rope of negligible mass lie on a Part A right at a constant velocity of 3.2 m/s by a horizontal force F (Figure 1) In terms of ma, mg, and , calculate the magnitude of the force F. AEO ? X•10

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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.