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33. 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
A
of each grain
of sand of radius
r
= 50
m = 50
×
10
−
6
m is given by
A
= 4
π
(50
×
10
−
6
)
2
= 3.14
×
10
−
8
m
2
(Appendix E contains a variety of geometry formulas). We introduce the notion of
density,
/
mV
ρ
=
, so that the mass can be found from
m
=
V
, where
= 2600 kg/m
3
.
Thus, using
V
= 4
r
3
/3, the mass of each grain is
()
3
6
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This note was uploaded on 09/09/2008 for the course PHYS 100 taught by Professor Shylnov during the Spring '08 term at Illinois Tech.
 Spring '08
 shylnov
 Physics

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