7_Physics ProblemsTechnical Physics

7_Physics ProblemsTechnical Physics - Chapter 1 P1.21...

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Chapter 1 7 P1.21 Conceptualize : We must calculate the area and convert units. Since a meter is about 3 feet, we should expect the area to be about A m m m 2 ≈= 30 50 1 500 af . Categorize : We model the lot as a perfect rectangle to use Area = Length × Width. Use the conversion: 1 m 3.281 ft = . Analyze : AL W == F H G I K J F H G I K J 100 1 3281 150 1 139 10 3 ft m ft ft m ft = 1390 m m 22 .. Finalize : Our calculated result agrees reasonably well with our initial estimate and has the proper units of m 2 . Unit conversion is a common technique that is applied to many problems. P1.22 (a) V × 40.0 m 20.0 m 12.0 m . m 3 a fa fa f 960 10 3 V = × 9 60 10 3 39 10 35 3 . m 3 . 2 8 f t 1 m f t 3 3 bg . (b) The mass of the air is mV × = × ρ air 33 kg m 9.60 10 m . kg 1 20 1 15 10 34 . ej e j . The student must look up weight in the index to find
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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