lecture 4 - ENGR ENGR13x2 EngineeringDesign Brain...

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GR 13x2 ENGR 13x2 Engineering Design /14/11 9/14/11
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rain Teasers Brain Teasers There are two telephone poles. Each one is 100 feet tall. They p p y 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 me hat That drooping rope is called a tenar from the somewhat. That drooping rope is called a catenary, from the Latin word for chain. e question is: What must be the distance between the two 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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etting ready for a great idea . . . Getting ready for a great idea . Calvin and Hobbes
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reativity . . . Creativity . ot limited to music art and literature Not limited to music, art, and literature Critical to the design process Separates design from analysis and replication You can’t make the necessary changes in the esign cycle without it design cycle without it Feels difficult sometimes
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This note was uploaded on 01/10/2012 for the course ENGR 1332 taught by Professor Nazemetz during the Fall '08 term at Oklahoma State.

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lecture 4 - ENGR ENGR13x2 EngineeringDesign Brain...

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