Phys. 211
Fall Semester 2015
Dr. F.Z. Amir
Course Overview
http://chem.winthrop.edu/courses
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Syllabus
Class notes
Math quiz
Homework
No Cell phones, tablets or Computers are allowed in
class
Office: 203, SIMS,
Office Hours: T 11:00-12:00, W 1:00 - 3:00, or by
appointment
Syllabus
• Homework problems are due on the dates
indicated on the class calendar. Your work is due
on time, with the exception of reasonable
documented excuses. Late work will be docked
50% of face value and 100% after solutions have
been posted. If you are going to miss a test, you
must notify me in advance (preferably one week)
so alternate arrangements can be made. If you
miss a test and your absence is not excused, a
grade of zero points must be assessed for that
particular piece of work. You must take the onehour exams as well as the final exam in order to
pass the course.
Exams
• The three exams are one hour duration. Notes and
your book are not allowed during the exam. All
relevant equations and physical constants will be
provided.
• The final exam will be two hours and will cover
early portions of the course so you must review the
entire course material.
• Grading:
Homework 15%
3 in Class exams 10% each
Final Exam 30 %
Lab 25%
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Tutoring
• Monday, Tuesday, and Wednesday 7-9
• Tuesday and Thursday 11-12:30
• Courses tutored:
Chemistry: 104, 105, 106, 301, 302, 310
Physics: 201, 211
Jessica Logan
loganj4@winthrop.edu
Michala Tesney
tesneyj2@winthrop.edu
Labs
• Labs start next week on Monday, August 31 ,
2015
• Do not miss any laboratory. You will receive "0"
for all missed laboratories.
Phys. 211
• Chapter 1
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What is Physics
Significant figures
Scientific Notation
Units
• Homework Assignment: Chapter 1: P.2,P.3,
P.7, P.11, P.13,P.19,P.23,P.41-Due on
Wednesday, Sept.2
What is Physics (Science)?
•Make Observations of the natural world
•Build Models that fit the observations
y=
1
2
at 2 +v ot + y o
Mathematical Models
Predict outcome based
on initial conditions
Observation: important first step toward scientific
Theory: requires imagination to tell what is
important, and is created to explain observations; will
make predictions
Observations: will tell if the prediction is accurate,
and the cycle goes on.
Not all theories can be absolutely verified, although
a theory can be proven false.
Significant Figures
Significant Figures
• 25.8 miles/hour
• sure of the 25,
estimating the last
digit
• 3 significant digits
Reading Significant Figures
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0.0000453200
Zeros written to the right of the
decimal point for the purpose of
spacing are NOT significant.
Final or ending Zeros are significant.
Non zero digits are always significant
There are 6 significant figures
Better rewritten as 4.53200x10-5
Reading Significant Figures
• Nonzero Digits are always significant
• Zeros between significant figures are significant.
• Examples:
409.8 s
0.058700 cm
950.0X 101 mL
Answer
• In 409.8 s : all four digits are significant
• In 0.058700 cm: the two zeros on the left are not
significant, they are used to place a decimal point, the
numbers 5,8,7 are significant, and so are the two final
zeros.
• In 950.0 X 101 ml: the final zero is significant since it
comes after the decimal point. The zero at its left is
also significant since it comes between two other
significant digits, so the results is four significant
figures.
Adding Significant Figures
• 67.9 g + 0.002 g + 3.51 g =
?
• Sum (or difference) can’t
be more precise than least
precise quantity
• Answer: 71.4 g
When you add or subtract you
keep the decimal place of the
least precise value.
Multiplying Significant
Figures
• Distance = velocity x time
Velocity = 65.4mph
Time = 4.2 hours
Distance=274.7 or 275 or 2.7x102 miles
When you multiply (or divide) you keep
the number of significant figures that
are equal to the quantity with the
smallest number of significant figures.
Importance of Units
• The 165 million dollars Mars Polar
Lander
Units help you figure out equations
Speed in mph
Density in kg/m3
Units help you
determine the
correct solution
www.nasa.gov
Units, Standards, and the SI System
Quantity Unit
Length
Time
Mass
Meter
Standard
Length of the path traveled
by light in 1/299,792,458
second
Second
Time required for
9,192,631,770 periods of
radiation emitted by cesium
atoms
Kilogram Platinum cylinder in
International Bureau of
Weights and Measures, in
Paris
Units, Standards, and the SI System
Units, Standards, and the SI System
Units, Standards, and the SI System
Units, Standards, and the
SI System
These are the standard SI
prefixes for indicating powers
of 10. Many are familiar; yotta,
zetta, exa, hecto, deka, atto,
zepto, and yocto are rarely
used.
Units, Standards, and the SI System
We will be working in the SI system, in which the
basic units are kilograms, meters, and seconds.
Quantities not in the table are derived quantities,
expressed in terms of the base units.
Other systems: cgs; units
are centimeters, grams, and
seconds.
British engineering system
has force instead of mass
as one of its basic
quantities, which are feet,
pounds, and seconds.
Converting units
1.
Multiplying by 1 leaves a quantity
unchanged.
2.
“1” can be represented as
3.
Choose form for ‘1’ for which units
match.
26.2mi = 26.2mi
1609m
1mi
4
= 4.22 ´ 10 ?
Converting units
1.
You're stopped by police for
speeding 30.0 km/h over the speed
limit on an Ontario highway. What is
the speed in mph?
2.
That'll be a $180 fine, plus a $35
victim surcharge and a $5 court fee
($220 in all) should you decide to
plead guilty and settle out of court.
(in Canadian Dollars). What is the
fine in US dollars?
Converting units
1. 30.0 km/h =?
1 km = 0.6214 miles
2. $220 Canadian Dollars = ?
1 US dollar = 0.97 Canadian
dollar