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38. (a) Letting
vr
Hr v
GMr
e
()
,
=
≤
=
2
we get
Mr
H G
32
2
≥
. Thus,
ρ
==
≥
M
r
M
r
H
G
43
3
4
3
8
23
2
ππ
π
.
(b) The density being expressed in Hatoms/m
3
is equivalent to expressing it in terms of
0
=
m
H
/m
3
= 1.67
×
10
–27
kg/m
3
. Thus,
( )
2
2
15
3
2
3
2
7
3
0
3
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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