Aluminum wire, current, voltage, density, find mass

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Homework Help Overview

The discussion revolves around a problem involving an aluminum wire, specifically focusing on its physical properties such as current, voltage, and density, with the goal of finding the mass of the wire. The context includes parameters like length, current, potential difference, and the material's density.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between resistance, resistivity, and cross-sectional area, with references to Ohm's law. There are attempts to derive the mass of the wire from known quantities, and some participants express uncertainty about the problem.

Discussion Status

The discussion is ongoing, with hints and partial guidance provided regarding the calculations needed to find the mass. There is no explicit consensus, but participants are exploring different aspects of the problem.

Contextual Notes

Some participants express confusion about the problem and mention other related questions, indicating a broader context of homework challenges. There is a reference to a specific physics class, suggesting a shared educational environment among some participants.

vaxopy
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An aluminum wire is hung between two towers and has a length of 175 m. A current of 125 A exists in the wire, and the potential difference between the ends of the wire is 0.300 V. The density of aluminum is 2700 kg/m3. Find the mass of the wire

I have no idea how to do this :'(
 
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HINT:
R = resistivity \ \frac{l}{S}

Daniel.
 
Resistance R = s \frac {l}{A} where s is the resistivity of Aluminum. Find the cross sectional area A using this equation. (R is found using ohm's law V = I*R)

Well, knowing cross sectional area, length and density you can find the
Mass.
 
Sorry Daniel. I did not see your post. I was busy typing... :smile:
 
vaxcopy are you in Frenrich's physics class in edmonton AB, i know how to do this question but i don't get the other ones if you are in her class. help?
 

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