2_Physics ProblemsTechnical Physics

2_Physics ProblemsTechnical Physics - 2 Physics and...

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2 Physics and Measurement SOLUTIONS TO PROBLEMS Section 1.1 Standards of Length, Mass, and Time No problems in this section Section 1.2 Matter and Model-Building P1.1 From the figure, we may see that the spacing between diagonal planes is half the distance between diagonally adjacent atoms on a flat plane. This diagonal distance may be obtained from the Pythagorean theorem, LL L diag =+ 22 . Thus, since the atoms are separated by a distance L = 0200 . n m , the diagonal planes are separated by 1 2 0141 += n m . Section 1.3 Density and Atomic Mass *P1.2 Modeling the Earth as a sphere, we find its volume as 4 3 4 3 6 37 10 1 08 10 36 3 21 3 ππ r =×= × .. m m ej . Its density is then ρ == × × m V 598 10 108 10 552 10 24 21 3 33 . . . kg m kg m . This value is intermediate between the tabulated densities of aluminum and iron. Typical rocks have densities around 2 000 to
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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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