# Math Review Friday, September 10, 2010.  Register clickers  Online homework and exam  Science math review  Before next time.

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Math Review Friday, September 10, 2010

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

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

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

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

 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.

 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)

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

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

 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

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

 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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