92
CHAPTER 17
17.55
(a) From
( )
VI
=∆
√
, the current is
3
8.00
10 W
667 A
12.0 V
I
V
×
==
=
∆
P
(b) The time before the stored energy is depleted is
7
3
3
2.00
10 J
2.50
10 s
8.00
10 J s
storage
E
t
×
=
×
×
P
Thus, the distance traveled is
( )( )
34
20.0 m s
2.50
5.00
10 m
50.0 km
dv
t
=⋅=
×
=
×
=
17.56
The volume of aluminum available is
3
53
33
115
10
kg
4.26
10
m
2.70
10 kg m
mass
V
density
−
−
×
=
×
×
(a) For a cylinder whose height equals the diameter, the volume is
23
44
dd
Vd
π
and the diameter is
()
13
.
2
6 1
0 m
4
0.037 85 m
V
d
ππ
−
×
=
The resistance between ends is then
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 Spring '09
 Physics, Current, Resistance, Energy, Work, ρL, opposite faces

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