Problem 6 Chapter 8: A 15 kg monkey climbs a uniform ladder with weight w = 1.2 102 N and length L = 3 meters as shown in the figure. The ladder rests against the wall at an angle of 0 = 60°. The upper and lower ends of the ladder rest on frictionless surfaces, with the lower end Fastened to the wall by a horizontal rope that is frayed and that can upport a maximum tension of only 80 N. a) Draw a force diagram for the ladder b) Find the normal force exerted by the bottom of the ladder c) Find the tension in the rope when the monkey is two-thirds of the way up the ladder d) Find the maximum distance, d, that the monkey can climb up the ladder before the rope breaks e) If the horizontal surface were rough and the rope were removed, how would your analysis of the problem be changed and what other information would you need to answer parts c and d? Rope

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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.