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013213215X ism02.pdf
013213215X_ism02.pdf
Showing 31 out of 31
013213215X ism02.pdf-Circuit Elements a Assessment...
013213215X_ism02.pdf-Circuit Elements a Assessment Problems AP
013213215X ism02.pdf-Circuit Elemen...
013213215X_ism02.pdf-Circuit Elements a Assessment Problems AP
Page 31
Problems
2–31
[b]
dT
dt
arm
=
2
.
39
×
10
-
4
p
arm
4
= 35
.
36
×
10
-
4
◦
C/s
t
arm
=
5
35
.
36
×
10
4
= 1414
.
23 s or 23
.
57 min
dT
dt
leg
=
2
.
39
×
10
-
4
10
P
leg
=7
.
07
×
10
-
4
◦
C/s
t
leg
=
5
×
10
4
7
.
07
=7
,
071
.
13 s or 117
.
85 min
dT
dt
trunk
=
2
.
39
×
10
-
4
(7
.
4)
25
=0
.
707
×
10
-
4
◦
C/s
t
trunk
=
5
×
10
4
0
.
707
= 70
,
711
.
30 s or 1
,
178
.
52 min
[c]
They are all much greater than a few minutes.
P 2.37
[a]
R
arms
= 400 + 400 = 800 Ω
i
letgo
= 50 mA (minimum)
v
min
= (800)(50)
×
10
-
3
= 40 V
[b]
No, 12
/
800 = 15 mA. Note this current is sufficient to give a perceptible
shock.
P 2.38
R
space
= 1 MΩ
i
space
= 3 mA
v
=
i
space
R
space
= 3000 V
.
© 2010 Pearson Education, Inc., Upper Saddle River, NJ.
All rights reserved. This publication is protected by Copyright and written permission should be
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