01prob_10

01prob_10 - Assigment #1, 4/1/10 Page 1 of 3 UC Davis...

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Unformatted text preview: Assigment #1, 4/1/10 Page 1 of 3 UC Davis Physics 9A Assignment #1 Cole [1.3] Thespeedoflightis310 8 m/s.Ittakeslight t = d v = 1 ft ( ) 0.305 m/ft ( ) 3 10 8 m/s = 1.0 ns totravel onefoot. [1.8] 180,000 fl / fn = 180,000 fl / fn 1/8 mi/ fl 14 D/ fn 24 hr/D =67mi/hr. [1.12] t =(365.24D/yr)(24hr/D)(3600s/hr)=3.155710 7 s. e = true value-approx value true value 100% e = 3.1557 3.1416 3.1557 100% =0.4% [1.19] Let'sestimatehowmanysheetstheremightbe.Aream(500sheets)ofpaperisabout2in thick.Fromthedimensionsoftheboxtheremustbetwostacksofpaper9inthick10in10 reams=5000piecesofpapersowearewithinafactorof2of10,000forourguess.Henceit mustbe10,000oflightweightpaperandcertainlynotamillion. [1.28] Aream(500sheets)ofpaperisabout2inthick.Estimatethata$500stackwouldbe about5cmthick.$50020/m=$10,000/m.Themoonis410 8 maway ($10 4 /m)(410 8 m)=$410 12 =4T$=4(terabucks).Thecostofbuildingaspaceshipand sendingitcouldwellcostseveralbilliondollarsoftoday'smoney,butthisisstillwellbelowa trilliondollars. [1.41] Thetotaldisplacementisthesumoftheindividualdisplacements: r=r 1 +r 2 +r 3 . ResolvingintoCartesiancomponentswitheastasthe x-directionandnorthasthe y- direction, r 1 = i + 3.25 j r 2 = 4.75 i + j r 3 = i 1.5 j r = 4.75 i + 1.75 j...
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01prob_10 - Assigment #1, 4/1/10 Page 1 of 3 UC Davis...

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