Physics: What is the approximate elevation at the top of this hill? a. 1240 b. 1300 C. 1000

What is the approximate elevation at the top of

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andrejr0330jr

16.11.2020

Physics

Explanation:

none

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Ответ:

Damagingawsomeness2

28.06.2022

Physics

The resistance of the cylindrical wire is $R=\frac{\rho l}{A}$ .

Here is the resistance, is the length of the wire and is the area of cross section. Since the wire is cylindrical $A=\frac{\pi d^2}{4}$ . Rearranging the above equation,

$A=\frac{\rho l}{R}\\ \frac{\pi d^2}{4}=\frac{\rho l}{R}\\ d=\sqrt{\frac{4\rho l}{\pi R}}$

Here $l=120, R=6, \rho=1.68(10^{-8})$ .

Substituting numerical values,

$d=\sqrt{\frac{4(1.68)(10^{-8}) (120)}{\pi (6)}}\\ d=0.0006541$

Te diameter of the wire is 0.6541 mm

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What is the approximate elevation at the top of this hill? a. 1240 b. 1300 C. 1000

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