Chap1 - Chapter 1 Due 11:00pm on Friday/Note To understand...

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Sheet1 Page 1 Chapter 1 Due: 11:00pm on Friday, September 25, 2009 /Note:/ To understand how points are awarded, read your instructor's Grading Policy. [Return to Standard Assignment View </myct/assignmentView?assignmentID=1263733>] Close Grading Policy [x] 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 multiple-choice and true/false questions. * You lose 3% credit per incorrect answer on questions that are not multiple-choice 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 Système International) or the more cumbersome English system.
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Sheet1 Page 2 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. ANSWER: 1730 Correct \rm cm Sometimes you will need to change units twice to get the final unit that you want. Suppose that you know how to convert from centimeters to inches and from inches to feet. By doing both, in order, you can convert from centimeters to feet.
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