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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 ModelBuilding
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 .
 Fall '11
 Staff
 Physics, Mass

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