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m Order of Magnitude: Rapid Estimatingw~ ar~ somdimes inl~rcswd only in an approximate \'ulu~ for a quantity. Thismight be because an "~1.'urak ,"akulation would take mor~ li me than it is wDrtll orwould require additional data thaI arc not al'ailable. In olher cases, We may want \0mah a rough eSlim"te in order \0 check an acrurak calculation nmdc on a calculatoT,\0 make sure lhal no blunders Were made when the numbt.rs wer" entered ... PRO B l EMS 0 till N G A rough eSlimate is made by rounding off all numocrs \0 one significantH
NOTE To eJCpre'\.S our resuh in Us. g,lllons, W~ so:~ in Ihe Tilbk on lhe insidefronl cowr lh,J( llikr = 10 .lm l "" ~g;'lIon. Htnce, Ihe lah conl"in8( lO'm'XI gallon/ 4 x 1O-' m') "" 2 x 10" g"lIons ofw;Oler.EXAMPLE 1- 7 ESTIMATE Thickness of a page. ESlimJle lhe Ihic~ - .. P RO B l (M SOL v I N Gness of" page of lhis book.APPROACH At firsl you might think Ihal U sp"cial m~asuring d~\'ice. amieromekr (Fig, I-II), is needed 10 m~asur~ th~ thickness of one page sincean ordinary ruler dearly won'l do. But w~ can uS you, and Ihe Olher touches Ihepok SO you eSlimak Ih"l dislance as 2 m (Fig. J -12a). You Ihen pace off Ih~diSlance from Ih~ pole 10 th~ base of Ihe building Wi1h big, I·m-Iong. sleps andyou gN a Inial of 16 sleps or 16m,SOLUTION Now you draw. 10 sc"le. Ihe di;lgr;lm ,hown in Fig. 1-12b usingIhcse me",u r em~nts. You can me
Page 1 and 2: NOTES TO STUDENTS (AND INSTRUCTORS)
Page 3 and 4: This CQnlpUlcr-coh;.occd pholO ul E
Page 5: ", , ,•,•(a)FIGURE 1- 2 (aJ 1'
Page 8 and 9: Srarong /h~ uIKmimyAssumed ""ur/(Ji
Page 10 and 11: Units, Standards, and the 51FIGURE
Page 12 and 13: TABLE 1-5 SI Base Ouantitiesand Uni
Page 17: dimension;,1 checks. We write a dim
Page 20: 42. An :"'cTage family of four uses

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