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Unformatted text preview: Joy by Apollo 100 (1972) An uptempo version of Johann Sebastian Bachs marvelous Jesu, Joy of Mans Desiring, the 10 th movement of Bachs cantata, Herz und Mund und Tat und Leben General Problem Solving, Significant Digits, and Units Auguste Rodin, 1902 How to Solve Problems General Problem Solving Tactics Problem Solving is what you do, when you dont know what to do. If you know what to do when you read a question, it isnt a problem, its an exercise. So, what do you do when you have a real problem? A fourstep plan 1.) Understand the problem. 2.) Devise a plan. 3.) Carry out the plan. 4.) Check the answer. In this course, more than 90% of the questions on quizzes and exams will be exercises and not true problems. But if you dont study, then every question will be a thinker problem. 1.) Understand the problem. Read the problem. Reread the problem. If its a real problem you didnt understand it the first time. Divide the given data or available information into three parts: 1.) Known(s): given facts (that may or may not be relevant) 2.) Unknown 3.) Conditions : temperature, pressure, date (ambient conditions that may or may not be needed for the solution) Example: What is the volume of 23 grams of lead, Pb? The mass of lead was measured at 25C in Muncie, Indiana in 1992. Known: 23 g of Pb, Unknown: Volume of that lead, Conditions: 25C, 1992, Muncie, IN Key words for Known and Unknown 2. Devise a plan. If you dont know where you are going, any road will take you there. Alice in Wonderland by Lewis Carroll (Charles Lutwidge Dodgson) If you dont know where you are going, you will wind up somewhere else. Yogi Berra Example: What is the volume of 23 grams of lead, Pb? The mass of lead was measured at 25C in Muncie, Indiana in 1992. Known: 23 g of Pb, Unknown: Volume of that lead, Conditions: 25C, 1992, Muncie, IN Find an equation (or conversion factor) that relates the known to the unknown. Here: Density = mass/volume (Algebraically solve this equation for Volume.) Look up Density of Pb (11.34 g/mL at 25C) 3.) Carry out the plan Example: What is the volume of 23 grams of lead, Pb?...
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 Fall '08
 jursich
 Alice in Wonderland

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