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Math Review Friday, September 10, 2010

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Register clickers Online homework and exam Science math review Before next time

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Can you correctly answer A to this question? A) Yes B) No http://kookaburra.com.au

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Online Math Exam – Due Sunday at 11:59 pm Online Homework for next week – Due Tuesday at 11:59 pm Practice problems…

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Read Ch. 1 in your text Significant Digits Scientific Notation Unit Analysis Vectors

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Digits that actually have meaning! ◦ All digits in a number except for trailing or leading zeros ◦ All digits that relate to the precision of the number Examples ◦ 1.001(4 sig figs) ◦ 234(3 sig figs) ◦ 900(1 sig fig) ◦ 0.005(1 sig fig) ◦ 3.4(2 sig figs) ◦ 45.6(3 sig figs) ◦ 10(1 sig fig) ◦ To write 900 and 10 with more sig figs need Sci. Not.

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A way of representing a number so that you can clearly see the significant digits and the order of magnitude ◦ 110 would be 1.1E2 or 1.1x10 2 Examples ◦ 1.001(1.001E0) ◦ 234(2.34E2) ◦ 900(9.00E2 or 9.0E2 or 9E2) ◦ 0.005(5E-3) ◦ 3.4(3.4E0) ◦ 45.6(4.56E1) ◦ 10(1.0E1 or 1E1)

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Accuracy = How close measurements are to the target Precision = Spread in measurements Accurate, not precisePrecise, not accurate

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Prefixes Conversion ◦ 1 mm = ___?___ m ◦ 0.001 m ◦ 1 inch = ___?___ cm ◦ 2.54 cm Solving Problems ◦ Make sure answer has the correct units

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Ways to write Vectors ◦ 3 mph to the right or 3 mph to the east ◦ 5 mph at 45 degrees from x axis ◦ (3,2) or Magnitude, Direction, Components

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Adding Vectors ◦ Break into components and add the components Subtracting Vectors – Add the negative vector

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Do the Online Math Exam ◦ Get the Connect Access card ◦ Enter the course ID – in syllabus materials Read Ch. 1 and Ch. 2 ◦ Ch. 1 won’t have any additional homework… ◦ Ch. 2 online homework will be due Tuesday at 11:59 pm Get course materials and make sure to register!

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