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Gen Problem Solving &amp; Units

# Gen Problem Solving &amp; Units - Joy by Apollo...

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“Joy” by Apollo 100 (1972) An up-tempo version of Johann Sebastian Bach’s marvelous “Jesu, Joy of Man’s Desiring”, the 10 th movement of Bach’s cantata, “Herz und Mund und Tat und Leben”

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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 don’t know what to do. If you know what to do when you read a question, it isn’t a problem, it’s an exercise. So, what do you do when you have a real problem?

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A four-step 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 don’t study, then every question will be a “thinker problem”.
1.) Understand the problem. Read the problem. Re-read the problem. If it’s a real problem you didn’t 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 25°C in Muncie, Indiana in 1992. Known: 23 g of Pb, Unknown: Volume of that lead, Conditions: 25°C, 1992, Muncie, IN

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Key words for Known and Unknown
2. Devise a plan. “If you don’t know where you are going, any road will take you there.” - Alice in Wonderland by Lewis Carroll (Charles Lutwidge Dodgson) “If you don’t 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 25°C in Muncie, Indiana in 1992. Known: 23 g of Pb, Unknown: Volume of that lead, Conditions: 25°C, 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 25°C)

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3.) Carry out the plan Example: What is the volume of 23 grams of lead, Pb?
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