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Unformatted text preview: Chapter 1 CHAPTER 1  Introduction, Measurement, Estimating 1. ( a ) Assuming one significant figure, we have 10 billion yr = 10 10 9 yr = 1 10 10 yr . ( b ) (1 10 10 yr)(3 10 7 s/yr) = 3 10 17 s . 2. ( a ) 4 significant figures . ( b ) Because the zero is not needed for placement, we have 4 significant figures . ( c ) 3 significant figures . ( d ) Because the zeros are for placement only, we have 1 significant figure . ( e ) Because the zeros are for placement only, we have 2 significant figures . ( f ) 4 significant figures . ( g ) 2, 3, or 4 significant figures , depending on the significance of the zeros. 3. ( a ) 1,156 = 1.156 10 3 . ( b ) 21.8 = 2.18 10 1 . ( c ) 0.0068 = 6.8 10 3 . ( d ) 27.635 = 2.7635 10 1 . ( e ) 0.219 = 2.19 10 1 . ( f ) 22 = 2.2 10 1 . 4. ( a ) 8.69 10 4 = 86,900 . ( b ) 7.1 10 3 = 7,100 . ( c ) 6.6 10 1 = 0.66 . ( d ) 8.76 10 2 = 876 . ( e ) 8.62 10 5 = 0.000 086 2 . 5. % uncertainty = [(0.25 m)/(3.26 m)] 100 = 7.7% . Because the uncertainty has 2 significant figures, the % uncertainty has 2 significant figures. 6. We assume an uncertainty of 1 in the last place, i. e., 0.01, so we have % uncertainty = [(0.01 m)/(1.28 m)] 100 = 0.8% . Because the uncertainty has 1 significant figure, the % uncertainty has 1 significant figure. 7. We assume an uncertainty of 0.2 s. ( a ) % uncertainty = [(0.2 s)/(5 s)] 100 = 4% . Because the uncertainty has 1 significant figure, the % uncertainty has 1 significant figure. ( b ) % uncertainty = [(0.2 s)/(50 s)] 100 = 0.4% . Because the uncertainty has 1 significant figure, the % uncertainty has 1 significant figure. ( c ) % uncertainty = [(0.2 s)/(5 min)(60 s/min)] 100 = 0.07% . Because the uncertainty has 1 significant figure, the % uncertainty has 1 significant figure. 8. For multiplication, the number of significant figures in the result is the least number from the multipliers; in this case 2 from the second value. (2.079 10 2 m)(0.072 10 1 ) = 0.15 10 1 m = 1.5 m . 9. To add, we make all of the exponents the same: 9.2 10 3 s + 8.3 10 4 s + 0.008 10 6 s = 0.92 10 4 s + 8.3 10 4 s + 0.8 10 4 s = 10.02 10 4 s = 1.0 10 5 s ....
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This note was uploaded on 04/03/2008 for the course PHYS 1C taught by Professor Whitten during the Winter '07 term at UCLA.
 Winter '07
 Whitten

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