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()
3
6
3
9
3
45
0
1
0
m
4k
g
2600
1.36
10
kg.
3m
3
r
mV
π
ρρ
−
−
×
§·
==
=
=
×
¨¸
©¹
We observe that (because a cube has six equal faces) the indicated surface area is 6 m
2
.
The number of spheres (the grains of sand)
N
that have a total surface area of 6 m
2
is
given by
2
8
82
6m
1.91 10 .
3.14
10
m
N
−
×
×
Therefore, the total mass
M
is
(
)
89
1.91 10
1.36
10
kg
0.260 kg.
MN
m
−
×
×
=
28. The metric prefixes (micro (
μ
), pico, nano, …) are given for ready reference on the
inside front cover of the textbook (see also Table 1–2). The surface area
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This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.
 Spring '06
 Stoler
 Physics

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