Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 48E: Although the preferred SI unit of area is the square meter, land is often measured in the metric...
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Please help me understand where the 2.54cm comes from to get 7.62•10^-5? This is a lecture problem
![Example 18-2 (Calculating the length of a wire)
A wire made of nichrome must have a resistance of 110 ohms. How long must the wire be (in meters) if
it is 0.003 inch in diameter? [oichrome =9.3 x 10° ( 2 m) -'].
EX 18-2
CALCULATE THE REQUIRED LENGTH.
Sketch of wire:
Convert diameter to SI units:
d= 0.003 INX
2.54 čm
-5
7.62x10
个
d = 0.003"
NICHROME
-IN-
100 CM
T= 9.3X10
R=1102
R=e& = AR
ARO - Td (R)o
%3D
%3D
4
E e= ? m
area of a circle
T (7.62X10-5m)" (110) 3x10
0.466 m
4
or 46.6 cm or 18.3 inches](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2d7d2d74-d827-467b-8d8e-9fee9720e388%2F7862dbc6-6307-4cf4-a685-bff3728108e1%2Fea5g6mo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Example 18-2 (Calculating the length of a wire)
A wire made of nichrome must have a resistance of 110 ohms. How long must the wire be (in meters) if
it is 0.003 inch in diameter? [oichrome =9.3 x 10° ( 2 m) -'].
EX 18-2
CALCULATE THE REQUIRED LENGTH.
Sketch of wire:
Convert diameter to SI units:
d= 0.003 INX
2.54 čm
-5
7.62x10
个
d = 0.003"
NICHROME
-IN-
100 CM
T= 9.3X10
R=1102
R=e& = AR
ARO - Td (R)o
%3D
%3D
4
E e= ? m
area of a circle
T (7.62X10-5m)" (110) 3x10
0.466 m
4
or 46.6 cm or 18.3 inches
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