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Thermal Physics - Solved Problem Set 1 | PHYS 224, Assignments of Thermal Physics

University of Washington (UW) - SeattleThermal Physics

Material Type: Assignment; Class: THERMAL PHYSICS; Subject: Physics; University: University of Washington - Seattle; Term: Unknown 1989;

Typology: Assignments

Pre 2010

Uploaded on 03/19/2009

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224๎˜ƒproblem๎˜ƒset๎˜ƒ1๎˜ƒsolutions
Problem๎˜ƒ1.3.๎˜ƒ(Kelvin๎˜ƒtemperature๎˜ƒexamples.)
(a)๎˜ƒHuman๎˜ƒbody๎˜ƒtemperature๎˜ƒis๎˜ƒโ€œofficiallyโ€๎˜ƒ37ยฐC,๎˜ƒor๎˜ƒ310๎˜ƒK.๎˜ƒ(In๎˜ƒthe๎˜ƒU.S.,๎˜ƒthis๎˜ƒofficial๎˜ƒtemperature๎˜ƒis๎˜ƒ
traditionally๎˜ƒconverted๎˜ƒto๎˜ƒ98.6ยฐ Fโ€”a๎˜ƒclassic๎˜ƒexample๎˜ƒof๎˜ƒfailing๎˜ƒto๎˜ƒround๎˜ƒoff๎˜ƒinsignificant๎˜ƒdigits.)
(b)๎˜ƒWater๎˜ƒis๎˜ƒsupposed๎˜ƒto๎˜ƒboil๎˜ƒat๎˜ƒ100ยฐC,๎˜ƒso๎˜ƒthat๎˜ƒwould๎˜ƒbe๎˜ƒ373๎˜ƒK.
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(d)๎˜ƒโ€”196ยฐC๎˜ƒwould๎˜ƒbe๎˜ƒ77๎˜ƒK,๎˜ƒso๎˜ƒliquid๎˜ƒnitrogen๎˜ƒis๎˜ƒabout๎˜ƒfour๎˜ƒtimes๎˜ƒcloser๎˜ƒto๎˜ƒabsolute๎˜ƒzero๎˜ƒthan๎˜ƒroom๎˜ƒ
temperature๎˜ƒis.
(e)๎˜ƒ327ยฐC๎˜ƒwould๎˜ƒbe๎˜ƒ600๎˜ƒK,๎˜ƒto๎˜ƒthree๎˜ƒsignificant๎˜ƒfigures.
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224 problem set 1 solutions

Problem 1.3. (Kelvin temperature examples.) (a) Human body temperature is โ€œofficiallyโ€ 37ยฐC, or 310 K. (In the U.S., this official temperature is traditionally converted to 98.6ยฐ Fโ€”a classic example of failing to round off insignificant digits.) (b) Water is supposed to boil at 100ยฐC, so that would be 373 K. ( ) I(c) I rememberb a nighti h i i n MiMi nnesota whenh theh temperature was reportedd as โ€”29ยฐF.29ยฐF Th That converts to โ€”34ยฐC, which is 239 K. (d) โ€”196ยฐC would be 77 K, so liquid nitrogen is about four times closer to absolute zero than room temperature is. (e) 327ยฐC would be 600 K, to three significant figures.