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Harry the painter swings year after year from his bosun’s
Chapter 2, Problem 28E(choose chapter or problem)
Harry the painter swings year after year from his bosun’s chair. His weight is 500 N and the rope, unknown to him, has a breaking point of 300 N. Why doesn’t the rope break when he is supported as shown at the left? One day, Harry is painting near a flagpole, and, for a change, he ties the free end of the rope to the flagpole instead of to his chair, as shown at the right. Why did Harry end up taking his vacation early?
Questions & Answers
QUESTION:
Harry the painter swings year after year from his bosun’s chair. His weight is 500 N and the rope, unknown to him, has a breaking point of 300 N. Why doesn’t the rope break when he is supported as shown at the left? One day, Harry is painting near a flagpole, and, for a change, he ties the free end of the rope to the flagpole instead of to his chair, as shown at the right. Why did Harry end up taking his vacation early?
ANSWER:Answer : Step 1) When normally the pulley is tied to a weight it gets balanced with tension force in the string , So here , As in fig(1) as both end of the rope are tied to bosun’s chair , so the tension in the string is balanced on both side of the string i.e 250 N its not crossing the breaking point of the string which balance the weight produced by harry 500N =250N + 250N Weight of the harry = Tension in string produced. FHarry F string