MasteringPhysics17a - MasteringPhysics: Assignment Print...

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MasteringPhysics: Assignment Print View .. 1 of 9 12/19/2007 1:02 PM [ Print View ] PHCC 141: Physics for Scientists and Engineers I - Fall 2007 17a. Temperature and Heat Due at 11:59pm on Friday, November 9, 2007 Hide Grading Details Number of answer attempts per question is: 5 You gain credit for: correctly answering a question in a Part, or correctly answering a question in a Hint. You lose credit for: exhausting all attempts or requesting the answer to a question in a Part or Hint, or incorrectly answering a question in a Part. Late submissions: reduce your score by 100% over each day late. 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 For Multiple-Choice or True/False questions, you lose 100% / ( # of options - 1 ) credit per incorrect answer. For any other question, you lose 3% credit per incorrect answer. Temperature and Temperature Scales Interconversion of Temperature Scales Celsius The world's most common temperature scale is Celsius. Abbreviated C, it is virtually the same as the old centigrade scale and therefore has 100 degrees between the melting point and boiling point of water, taken to occur at 0 and 100 degrees, respectively. Kelvin Temperature is a measure of the thermal energy of a system. Thus cooling can proceed only to the point at which all of the thermal energy is removed from the system, and this process defines the temperature of absolute zero . The Kelvin scale, also called the absolute temerature scale, takes its zero to be absolute zero. It uses units of kelvins (abbreviated K), which are the same size as the degrees on the Celsius scale. Fahrenheit This anachronistic temperature scale, used primarily in the United States, has zero defined as the lowest temperature that can be reached with ice and salt, and 100 degrees as the hottest daytime temperature observed in Italy by Torricelli. Part A In the equation of state for the perfect gas, , which of the following three temperature scales must be used? ANSWER: Celsius Kelvin Fahrenheit In physical equations, you are free to use any units for the physical quantities that you wish, provided that you use the same units consistently throughout that equation. However, systems of units do not shift the zero: Zero feet is the same length as zero meters. This is not true for shifted temperature scales like Farenheit and Celsius--their zeros are arbitrarily displaced from absolute zero (and do not even agree with each other). You must use a temperature scale whose zero is at absolute zero in physical formulas involving the temperature. Part B What is the formula used to convert a temperature in degrees Celsius ( ) to the same temperature in kelvins ( )?
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MasteringPhysics17a - MasteringPhysics: Assignment Print...

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