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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 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 Wed 1400-1530 1530-1630 Hebb 12 L1G Thur 0930-1100 1100-1200 Hebb 10 L1H Thur 1400-1530 1530-1630 Hebb 10 L1J Fri 1400-1530 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 Wed 0830-0930 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

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.

Setting up I-clicker

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.

Test of iClicker

I am a

1) 1st year college student;

2) 2nd year college student;

3) 3nd year college student

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.

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.“

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.

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.

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?

1. Yes

2. No

3. Not enough information to decide

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 m = 5 x 10-7 m.– 1 inch = 25.4 mm = .0254 m

Driving to Seattle, we see that the speed limit on I-5 in Washington state is 70mile/h. This is close to

A) 10m/s;

B) 20m/s;

C) 30m/s;

D) 40m/s.

It was reported that in the mid of last July in Phoenix, Arizona temperature reached 112F. This is about

A) 35C,

B) 38C,

C) 40C,

D) 45C.