lecture 4 - ENGR ENGR13x2 EngineeringDesign Brain...

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ENGR 13x2 Engineering Design 9/14/11
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Brain Teasers There are two telephone poles. Each one is 100 feet tall. They are parallel and an unknown distance apart. We're going to attach a 150 foot rope from the very top of one of the poles to the top of the other. This rope will, of course, droop down some hat That drooping rope is called a catenar from the somewhat. That drooping rope is called a catenary, from the Latin word for chain. The question is: What must be the distance between the two poles, so that the lowest point of the catanary is 25 feet above the ground? (cartalk.com) A rope burns non uniformly for exactly one hour. How do you measure 45 minutes, given two such ropes? (expandyourmind.com)
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If the poles are 100 feet tall and the rope is 150 feet long then the only way for the rope to be 25 feet off the ground is if the poles are touching.
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Light both ends of rope 1. Light one end of rope 2. When rope 1 burns out (30 minutes), light the other end of rope 2. When rope 2 burns out it will be exactly 45 minutes.
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Getting ready for a great idea . . . Calvin and Hobbes
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Creativity . . . Not limited to music art and literature Not limited to music, art, and literature Critical to the design process S t d i f l i d li ti Separates design from analysis and replication You can’t make the necessary changes in the design cycle without it Feels difficult sometimes
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Barriers to creativity Internal factors Fear of rejection / failure / risk Pre conceived notions Pre conceived notions “I’m just not a creative person”
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