6. A 4.00-kg block rests between the floor and a 3.00- 3.00 kg kg block as shown in the figure. The 3.00-kg block is tied to a wall by a horizontal rope. If the coefficient F = ? 4.00 kg of static friction is 0.800 between each pair of surfaces in contact, what horizontal force F must be applied to the 4.00-kg block to make it move? Ans 78.4 N 7. Two blocks are connected by a string that goes over an ideal pulley as shown in the figure. Block A has a mass of 3.00 kg and can slide over a rough plane of

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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.