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Chapter 1
Due: 11:00pm on Friday, September 25, 2009
/Note:/ To understand how points are awarded, read your instructor's
Grading Policy.
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Grading Policy
/Number of answer attempts per question is:/ unlimited
/You gain credit for:/
* Correctly answering a question in a Part
* Correctly answering a question in a Hint
* Not opening a Hint (2% bonus)
/You lose credit for:/
* Exhausting all attempts or giving up on a question in a Part or Hint
* Incorrectly answering a question in a Part
/Late submissions:/ reduce your score by 0.4% over each hour late, but
never by more than 30%
/Hints/ are helpful clues or simpler questions that guide you to the
answer. Hints are not available for all questions.
There is /no penalty/ for leaving questions in Hints unanswered.
/Grading of /Incorrect Answers/ before the last attempt:/
* You lose /100%/(# of options  1)/ credit per incorrect answer on
multiplechoice and true/false questions.
* You lose 3% credit per incorrect answer on questions that are not
multiplechoice or true/false.
Converting Units: The Magic of 1
*Learning Goal: *To learn how to change units of physical quantities.
Quantities with physical dimensions like length or time must be measured
with respect to a /unit/, a standard for quantities with this dimension.
For example, length can be measured in units of meters or feet, time in
seconds or years, and velocity in meters per second.
When solving problems in physics, it is necessary to use a consistent
system of units such as the International System (abbreviated SI, for
the French SystÃ¨me International) or the more cumbersome English system.
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In the SI system, which is the preferred system in physics, mass is
measured in kilograms, time in seconds, and length in meters. The
necessity of using consistent units in a problem often forces you to
convert some units from the given system into the system that you want
to use for the problem.
The key to unit conversion is to multiply (or divide) by a ratio of
different units that equals one. This works because multiplying any
quantity by one doesn't change it. To illustrate with length, if you
know that 1\
1 = \frac{2.54\
To convert inches to centimeters, you can multiply the number of inches
times this fraction (since it equals one), cancel the inch unit in the
denominator with the inch unit in the given length, and come up with a
value for the length in centimeters. To convert centimeters to inches,
you can divide by this ratio and cancel the centimeters.
For all parts, notice that the units are already written after the
answer box
Part A
How many centimeters are there in a length 682.2 inches?
Express your answer in centimeters to three significant figures.
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This note was uploaded on 11/09/2009 for the course PHYSICS 2030 taught by Professor Chye during the Fall '09 term at Hawaii Pacific.
 Fall '09
 Chye
 Physics

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