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PHY183-Lecture4

# PHY183-Lecture4 - Physics for Scientists Engineers 1 Spring...

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January 12, 2006 1 Engineers 1 Engineers 1 Engineers 1 Spring Semester 2006 Lecture 4

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January 12, 2006 2 Few Points Few Points Few Points ß Movie “Powers of Ten” at the end of the lecture (if time) ß No class on Monday: MLK Day ß Lisa Lapidus takes over section 001 on Tuesday ß Homework First set opened Due by Wednesday 23:59 ß Clicker Quizzes (trials) begin next week
January 12, 2006 3 Learning Center Learning Center Learning Center ß Helproom starts Tuesday ß Honors students: look at your email for your schedule (by tomorrow) ß TA’s (emails on syllabus) Tuesdays Wednesdays Chong Zhai 13:00-15:00 15:00-19:00 Dan O’Brien 15:00-18:00 19:00-21:00 20:00-21:00 Jiping Li 09:00-13:00 09:00-15:00 18:00-20:00

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January 12, 2006 4 Scientific Notation Scientific Notation Scientific Notation ß Physical quantities consist of a number that specifies its magnitude AND its unit Example: this lecture lasts 50 minutes (number) (unit) ß For very large or very small numbers, we use scientific notation number = mantissa 10 (exponent) Example: 3.2·10 -12 (or 3.2x10 -12 ) Product easy: (4.8x10 -17 )x(7.21x10 7 )=34.6x10 -10 =3.46x10 -9 You must enter number in scientific notation into the LON-CAPA homework system as 3.2e-12 (or 3.2E-12)
January 12, 2006 5 Significant Figures Significant Figures Significant Figures ß Two statements: The population of the USA is 294,109,799 The population of the USA is 294,000,000=2.94·10 8 First statement implies precision that is simply not warranted Second statement claims that the population is somewhere between 293M and 295M. This is justified! ß General Rule: The number of digits we write down in a number specifies the precision with which we claim to know that number. US Census Bureau August 2004 US Census Bureau August 2004

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January 12, 2006 6 Example: Significant Figures Example: Significant Figures Example: Significant Figures Suppose we are told that the radius of a circle is 2.66 feet; what is its circumference?
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PHY183-Lecture4 - Physics for Scientists Engineers 1 Spring...

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