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All course materials are available at vista .

All course materials are available at vista . Online surveys at Vista (pre- and post-course) Physics 100 Pre-Course Survey Due 8am Monday, Sept 8, 2008. Labs in Hebb 20 Section Lab time T utorial time tutorial room

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All course materials are available at vista .

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  1. All course materials are available at vista. Online surveys at Vista (pre- and post-course) Physics 100 Pre-Course Survey Due 8am Monday, Sept 8, 2008.

  2. Labs in Hebb 20 Section Lab time Tutorial time tutorial room L1C Tues 0930-1100 1100-1200 Hebb 10 L1D Tues 1400-1530 1530-1630 Hebb 10 L1E Wed 0800-0930 0930-1030 LSK 462 L1M Wed 1100-1230 1230-1330 Hebb 10 L1F Wed1400-1530 1530-1630 Hebb 12 L1G Thur 0930-1100 1100-1200 Hebb 10 L1H Thur1400-1530 1530-1630 Hebb 10 L1J Fri1400-1530 1530-1630 Hebb 13 Tutorial time Lab time LC1 Tues 1000-1100 1100-1230 Hebb 10 LD1 Tues 1430-1530 1530-1700 Hebb 10 LE1 Wed0830-0930 0930 -1100 LSK 462 LM1 Wed 1130-1230 1230-1400 Hebb 10 LF1 Wed 1430-1530 1530-1700 Hebb 12 LG1 Thurs 1000-1100 1100-1230 Hebb 10 LH1 Thurs 1430-1530 1530-1700 Hebb 10 LJ1 Fri 1430-1530 1530-1700 Hebb 13

  3. At the beginning of each class: Hold your On/Off button for 2 seconds (the blue Power Light will flash) Enter [AA] Your “Vote Status” light will turn green after you’ve entered this new frequency. Your frequency is now changed for the duration of the lecture & you may vote. Settingup I-clicker

  4. How do you vote? When I ask a question in class (and start the timer), select A, B, C, D, or E as your vote. I may also ask you to talk about your possible choice/answer with your neighbor or in groups.

  5. Test of iClicker • I am a • 1st year college student; • 2) 2nd year college student; • 3) 3nd year college student

  6. Phys100 section 102L2: What to achieve? 1) Understand general physics “laws” Examples: Energy conservation law, Newton’s law, Coulomb’s law, Faraday’s Law, Maxwell’s Law, Boltzmann’s Law, the Law of quantum mechanics,…… 2) Understand the real world using laws/principles; Model the real world using basic laws/principles and analyze quantitatively a physical phenomenon.

  7. Models • “A model is a simplified description of reality…isolating the essential features, and developing a set of equations that provide an adequate, although not perfect description of reality.” • “Physics, in particular, attempts to strip a phenomenon down to its barest essentials in order to illustrate the physical principles involved.“

  8. Tools we are going to use • Mathematics provides an extremely powerful tool to describe theories and to model or simulate reality. • Experimental techniques including the data acquisition and analysis give us the ways to test theories/models and collect useful information of technologies and sciences.

  9. Dimension of a physical quantity Dimension is associated with combinations of mass, length and time etc. D(Speed)=L/T D(Momentum)=M L / T If X=Y, D(X)=D(Y). This provides a way to check if your results make sense.

  10. Dimensional analysis Ex: Formula for wavelength of light A scientist working in the field of applied optics obtained the following formula for the wavelength of light measured by an instrument: λ = (a2+b2/c)/d where a, b, c and d are the dimensions (in meters) of the different parts of the instrument. Q1. Is this formula correct? • Yes • No • Not enough information to decide

  11. Units of a physical quantity • Physical quantities have units. Examples. • Important to use standardized SI units: m, kg, s, N, J, oK…. with appropriate prefixes • We very often see other units such as cm, inches, miles, nautical miles, ft, pounds, oC, oF, etc. • Need to convert units in problem sets. Examples: • 0.5 mm = 5 x 10-7 m. • 1 inch = 25.4 mm = .0254 m

  12. Driving to Seattle, we see that the speed limit on I-5 in Washington state is 70mile/h. This is close to • 10m/s; • 20m/s; • 30m/s; D) 40m/s.

  13. It was reported that in the mid of last July in Phoenix, Arizona temperature reached 112F. This is about • 35C, B) 38C, C) 40C, D) 45C.

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