Announcements 1/5/10 Prayer Introductions This section: Physics majors and minors

only!a. For others, section 1 is in 445 MARB

– Meets at same time– Yes, you should head there right now

Two signup sheets to be passed arounda. Willing to offer prayers in class b. Info for class directory, to aid you in

forming study groups

Syllabus

Objectives. Four units:a. Fluids/heatb. Waves/soundc. Opticsd. Relativity

Syllabus, cont. Schedule

a. Reading assignments, lecture topics b. HW/Lab/Term project due datesc. Exams

Syllabus, cont. Grading

a. Guaranteed levels:

b. Categories

Syllabus, cont. Clicker quizzes

a. Reading quizzes– 2 points if right, 1 point if attempted

b. Thought questions– 1 point if attempted

c. All questions from a day = 1 quizd. 4 free quizzes, no make-up quizzese. Register your clicker via class website

ASAP!

Syllabus, cont. Exams, final, term project

a. More details later Labs

a. Assignments at back of packetb. First lab begins this Saturday

Extra credita. Read about on your own

Syllabus, cont. Class website (typo in syllabus)

a. www.physics.byu.edu → Courses → Class Web Pages → Physics 123 (Colton J)

b. http://www.physics.byu.edu/faculty/colton/courses/phy123-winter11/

On website:a. Study aids

– Lecture notes– Videos– Old exams– Exam solutions

b. HW submissionc. Check graded. Obtain class ID

e. Clicker registrationf. Labs 3, 6 detailsg. Term project detailsh. Mathematica infoi. Math review handoutj. Etc.

Syllabus, cont. Where to get help on homework

a. Other studentsb. Dr. Colton’s office hours

– MWF right after class, 2-3 pm, Underground Lab study area under the skylight

– If you don’t know where that is, there are directions in the syllabus

c. Chris Mackprang’s office hours– MWF 4-5:30 pm, same location as mine

d. The Tutorial Lab, 3rd floor of ESC (info on class webpage)

e. Smart relatives?

Syllabus, cont. Homework: paper-only vs computer-

graded The computer-graded HW systemSyllabus packet contains problems:

Get your missing numbers (“data”) from class website → Put in the [xx]______ spaces before you work the problem

set 1. [01] 3.43 [02] 8.20 [03] 22.2 [04] 30.2 [05] 39.8 [06] 4.0 etc.

Syllabus, cont. Computer-graded HW system, cont.

Answer range in packet, at end of list of problems:

Indicates units, range and decimal places of answer

Type into website form: 63.8

Submit all answers at once

Partial credit, aka “retries”

Points for each successive try: 5, 5, 3, 0 If you miss, correct answer is given to you Use new data each time No retries on multiple choice problems

Syllabus, cont. Final general HW comments:

a. Late HW– 4 free late ones, chosen to give you most pts– All other late HW is 50%

b. All work must be turned in, even for computer-graded problems

– TA has 5 pts at his discretion, for legibility/completeness/etc

c. Where to turn in work– Slot labeled “Phys 123, section 2” in boxes

near room N375 ESC– Don’t put name on work, just your CID

d. First HW due Wednesday night!

And now, for the Physics… Serway chapters 1-13: Newtonian

Mechanicsa. Covered in Physics 121

Serway chapter 14: Fluids (static & moving)

a. Starting right now!

Pressure

1 Pascal = ??

1 atm = ??a. 1.013105 Pab. 14.70 psi

ForceP

Area

Demos

Pressure vs. force Collapsing can Magdeburg hemispheres

a. von Guericke and the first vacuum pump, 1654 demo for Ferdinand III

Density

Units?

Density of water: a. 1000 kg/m3

= 1 g/cm3

“Specific gravity”

massdensity

volume

Air, standard conds

0.0013

Wood (oak) 0.6 – 0.9

Liquid nitrogen 0.81

Ice 0.92

Water 1.00

Bricks 1.84

Aluminum 2.70

Steel 7.80

Silver 10.50

Lead 11.30

Gold 19.30

Platinum 21.40

Pressure vs. Depth

Weight of water above area A? (depth h)

Pressure at h: (include weight of air)

Video

Pressure pushes on all sides

Thought Question

Thought question: Where is the pressure greater, one meter beneath the surface of Lake Michigan or one meter beneath the surface of a swimming pool?

a. Lake Michiganb. swimming poolc. the same

Summary

“How to get started”

http://www.physics.byu.edu/faculty/colton/courses/phy123-winter11/

Work hard!!

(More Strange Quark comics at Dr. Durfee’s website, http://sqcomic.com )