20. To organize the calculation, we introduce the notion of density:
ρ
=
m
V
.
(a) We take the volume of the leaf to be its area
A
multiplied by its thickness
z
. With
density
ρ
= 19.32 g/cm
3
and mass
m
= 27.63 g, the volume of the leaf is found to be
V
m
=
=
ρ
1430
.
.
cm
3
We convert the volume to SI units:
(
)
3
3
6
3
1 m
1.430 cm
1.430
10
m .
100 cm
V
−
§
·
=
=
×
¨
¸
©
¹
Since
V
=
Az
with
z
= 1
×
10
6
m (metric prefixes can be found in Table 1–2), we obtain
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 Spring '08
 shylnov
 Physics, Mass, International System of Units, SI prefix, Kilogram, Litre, M3

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