Welcome to 2048

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Welcome to 2048

• Dr. Jeffrey B. Bindell
• bindell_at_physics.ucf.edu
• www.physics.ucf.edu/bindell

2048
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Class MeetsMonday, Wednesday, Friday1030-1120
AM
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TextbookPhysics for Engineers and
ScientistsVolume I (Mechanics) Serway
JewittThompson Brooks/Cole (2004)
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General Information
Instructor Dr. Jeffrey BindellSchedule M,W,F
1030 AM to 1120 AM Room 359Phone
407-823-4194E-mail bindell_at_physics.ucf.eduWebsi
te www.physics.ucf.edu/bindell OFFICE HOURS
M,W,F 730-930 AM 1130-1230 (Pot
Luck) MAP-417
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Reminder
This is a HARD Course!
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Grades
Item Weight
Mid Semester Examinations 45
Final Examination 30
Homework 15
In Class Quizzes 10
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Homework
It is important to notice that homework counts
for 15 of your grade. Homeworks will be based
on WebAssign. Although extensions will be
available, valid reasons should be offered at the
time or he request. There will be one or two
assignments per chapter. Each assignment will
contain between 5 and 12 problems (usually). You
must complete the assignment before the due time
or you must request an extension. You will need
a reason.
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No Curve
SCORE GRADE
85-100 A
75-84 B
60-74 C
50-59 D
Less than 50 F
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Approximate Exam Schedule
EXAM NUMBER DATE
1 1/27
2 2/10
4 3/31
FINAL EXAM 5/1
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TENTATIVE
PHY 2048 PHY 2048 PHY 2048 PHY 2048 PHY 2048
WEEK DATE MON WED FRI
1 9-Jan Intro. Ch 1 Topics Ch 2 1 D Motion Ch 2 1 D Motion
2 16-Jan HOLIDAY Ch 2 1 D Motion Ch 3 Vectors
3 23-Jan Ch 3 Vectors Ch 3 Vectors EXAM 1
4 30-Jan Ch 4 2D Motion Ch 4 2D Motion Ch 4 2D Motion
5 6-Feb Ch 5 Laws of Motion Ch 5 Laws of Motion Ch 5 Laws of Motion
6 13-Feb Ch 5 Laws of Motion Ch 5 Laws of Motion Ch 5 Laws of Motion
7 20-Feb EXAM 2 Ch 6 Circlular Motion Ch 6 Circlular Motion
8 27-Feb Ch 6 Circlular Motion Ch 7 Work Energy Ch 7 Work Energy
9 6-Mar Ch 7 Work Energy Ch 8 Potential Energy Ch 8 Potential Energy
10 13-Mar BREAK BREAK BREAK
11 20-Mar Ch 8 Potential Energy Ch 9 Momentum Ch 9 Momentum
12 27-Mar Ch 9 Momentum EXAM 3 Ch 10 Rotation
13 3-Apr Ch 10 Rotation Ch 10 Rotation Ch 11 Angular Mom.
14 10-Apr Ch 11 Angular Mom. Ch 11 Angular Mom. Ch 12 Statics
15 17-Apr Ch 12 Statics Ch 15 Oscillations Ch 15 Oscillations
16 24-Apr Ch 15 Oscillations No Class No Class
17 1-May FINAL EXAM No Class No Class
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WebAssign

• You need to purchase a WebAssign login either
  from the bookstore or from the WebAssign website
  (with credit card).
• For your first contact with WebAssign, go to
  http//www.webassign.net/info/support/access_codes
  .html
• Follow the guides to purchase a registration or
  to Login. The left side of the page has a scroll
  down menu that should get you where you need to
  get.
• Be sure to bookmark the final login screen
  because you will be using it quite a bit (I
  hope).
• Your login ID is your PIN with (or possibly
  without) the leading 0 and without any letters
  from your first name. Your password has been set
  to ihatephysics. After a successful login, be
  sure to change your password to something else to
  protect the privacy of your account.

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ratemyprofessors.com
Completely unforgiving. Unhelpful office hours
from which you leave more confused and with more
questions than you came with. Seems to have no
time for students, will not listen to any excuse,
reasonable or not. Do not be 1 minute late on
quiz day. Family emergency, car trouble
unforgivable sin
Very difficult. Not in a tough way, but in an
unhelpful way. Does not go over problems and his
office hours are not helpful at all. You leave
just as confused. Does not go over tests. 
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ratemyprofessors.com
Waiting for grades to come in. Have no idea if I
passes or failed. Tests are UNFAIR, GRADING IS
UNFAIR. I didn't miss more than a day of class.
This class is an experiment and I don't like
being the guinea pig when my GPA is on the line.
Something better give or EVERYONE in the class
will fail. 
This was a SCALE-UP Course
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ratemyprofessors.com
this class sucks, but bindell makes it doable. He
answers ?'s, speaks clearly, and is pretty funny
too. Fair tests and decent curves for the final
grade. Do your webassign and make yourself known,
you will pass this class... 
Very hard class.Tests consist of 1 homework
problem and 2 unseen problems, one easy, one
hard.If you go to office hours(if you can get him
on a day he's there)he will usually give you
extra points on tests that TA's graded unfairly.
He also curves the grades a lot.I was looking at
a C and made an A 
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ratemyprofessors.com
Tough class. Bindell is a funny guy and does a
pretty good job teaching. Just make sure that you
study and don't fall behind. 
Physics II is hard, no doubting that. But Jeff is
by far a VERY reasonable professor. Speaks
clearly, reasonable weekly quizzes, very flexible
with webassigns, and wants the class to do well.
Here is something I learned the hard way STUDY
HARD FOR THE TESTS, IF YOU DO NOT, YOU WILL FAIL
THEM. PERIOD. 
It is men like this that keep UCF from being
considered an elite public uninversity. The man
is comepletely and utterly ingorant of how to
convey a concept to another human being. He wont
answer questions. His tests are not
representative of the material. He will show you
reviews such as this and refute them. Don't
listen. Get out at all costs. 
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The Facts Spring 05
F includes people who forgot to withdraw and just
stopped attending.
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What I learned

• Students dont like lectures, especially
  PowerPoint.
• Students dont like WebAssign
• Some problems too hard
• Some problems are not coded correctly by WA.
• Students dont like tests unless they are easy.
• Theyre NOT!
• Course is hard, why would tests be easy???

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My gripes .

• Students study at the last minute.
• Students have big holes in their math skills
• Interpreting Graphs.
• Using Calculus.
• Students come to my office expecting me to solve
  their homework problems.
• I will always help I will not give you the
  answers!
• Work on the problems before you come for help.

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How to get an A.
STUDY !
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PHY2049 Mechanics

• The physics of how classical objects move.
• Terms
• mass, distance, time
• Force, torque
• displacement, speed, acceleration
• momentum, energy
• angular analogs
• Issues for many students
• calculus, graphical interpretation

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Important Definitions

• Length or Distance
• How far something moves or travels.
• Measured against some agreed upon standard.

Length Standard .. The Gorf
1 2 3
4 1/8
4 1/8 Gorfs
Unknown Length
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Systems of Units

• SI Units . Meters, Seconds, Newtons/Kilograms
• English System .. Feet/yards, seconds,
  pounds/poundals

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The yard

• One postulate was that the yard was derived from
  the girth  of a person's waist, while another
  claim held that the measure was invented by Henry
  I of England  as being the distance between the
  tip of his nose and the end of his thumb. These
  are believed to be more likely standardizing
  events as opposed to an actual coining of the
  measure.

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The real standard
The Meter
More better ..
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More Important Definitions

• TIME
• The subjective distance between two EVENTS.
• It needs to be objective ie measurable and
  reproducible.
• Original Clock The Earths Rotation
• It is two days journey
• Todays Clocks
• He ran the race in 4 hours, 2 minutes and 21.85
  seconds

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DEFINITION The Second of Time
Unit of time (second)        The unit of time,
the second, was defined originally as the
fraction 1/86 400 of the mean solar day. The
exact definition of "mean solar day" was left to
astronomical theories. However, measurement
showed that irregularities in the rotation of the
Earth could not be taken into account by the
theory and have the effect that this definition
does not allow the required accuracy to be
achieved. In order to define the unit of time
more precisely, the 11th CGPM (1960) adopted a
definition given by the International
Astronomical Union which was based on the
tropical year. Experimental work had, however,
already shown that an atomic standard of
time-interval, based on a transition between two
energy levels of an atom or a molecule, could be
realized and reproduced much more precisely.
Considering that a very precise definition of the
unit of time is indispensable for the
International System, the 13th CGPM (1967)
decided to replace the definition of the second
by the following (affirmed by the CIPM in 1997
that this definition refers to a cesium atom in
its ground state at a temperature of 0 K) The
second is the duration of 9 192 631 770 periods
of the radiation corresponding to the transition
between the two hyperfine levels of the ground
state of the cesium 133 atom.
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What should you remember from the previous slide?

• The second used to be defined as some fraction of
  the length of the average day.
• The second is now defined as the time it takes
  for some mysterious atomic process to occur.
• This is something that can be measured in the
  laboratory.
• This serves as a STANDARD for time.

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Sun Clock
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Water Clocks
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Pendulum Clocks
We will study how a pendulum works later in the
semester.
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Cuckoo Clock
Cuckoos are not covered in this class.
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And so on
Rolex (10K)
Atomic Clock (NASA) megabucks
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Mass The Standard Kilogram
A quantity of matter.
Locked up in Paris. We have copy
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Prefixes
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Unit Conversion-How many seconds old are you?

• Assume you are exactly 21 years old and just
  qualified for your first legal drink.
• The Trick
• Keep multiplying by one!

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Example
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So
21 x 365 x 24 x 60 x 60 sec 662,256,000 sec
6.62 x 108 seconds
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First WA Assignment is on board

• To think about
• SI Units
• Unit Conversion
• Significant Figures
• Dimensional Analysis
• We will do this throughout the semester.

All discussed in Chapter 1 of the textbook.
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Going around in circles
?
spathlength
A
x
A
?
B
xdisplacement
B
ttime interval (A,B) 10 seconds
Seconds
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DEFINITIONS

• spath length or total distance trraveled.
• xdisplacement NET distance traveled.
  Difference between final and initial position
  independent of the path.
• ttime of the trip. Usually measured in seconds.

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More Definitions

• average speed distance traveled (s) / time
  taken meters/sec.
• average velocity displacement/time m/s
• Note the actual SYMBOL used for distance and
  displacement will usually change with the context
  of the problem.

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-40m
10s
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In the limit -
Dx
Dt
In the limit of Dt?0, velocity is the slope of
the tangent to the x-t curve!
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Example
The position versus time for a certain particle
moving along the x axis is shown in Figure P2.3.
Find the average velocity in the time intervals
(a) 0 to 2 s, (b) 0 to 4 s, (c) 2 s to 4 s, (d) 4
s to 7 s, (e) 0 to 8 s.
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A position-time graph for a particle moving along
the x axis is shown in Figure P2.7. (a) Find the
average velocity in the time interval t 1.50 s
to t 4.00 s. (b) Determine the instantaneous
velocity at t 2.00 s by measuring the slope of
the tangent line shown in the graph. (c) At what
value of t is the velocity zero?
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For vconstant
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Constant Velocity
v
x0
xi
xf
xf xi distance traveled v t
MOTION DOESNT ALWAYS START AT THE ORIGIN
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Question
The position of a particle as a function of time
is given by the equation below. (a) What is
the position of the particle at t2 seconds? (b)
What is the velocity of the particle at t 2
seconds? (c) At what time is the particles
velocity 0? (d) Is the particle ever at the
origin? When?
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Oops no solution!
x
What does tlt0 mean??
t