What is the relationship between diameter and mass per length in a steel wire?

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SUMMARY

The relationship between diameter and mass per length in a steel wire is directly influenced by the wire's cross-sectional area, which is proportional to the square of the diameter. Given a density of 7860 kg/m³ for steel, the mass per unit length (m/L) can be calculated using the formula m/L = density × cross-sectional area. For a wire with a larger diameter, the mass per length increases due to the larger cross-sectional area, confirming that a thicker wire will indeed have a greater mass per length.

PREREQUISITES
  • Understanding of basic physics concepts, specifically tension and wave speed.
  • Familiarity with the formula for calculating mass per unit length.
  • Knowledge of geometric properties of circles, particularly area calculations.
  • Basic understanding of material properties, specifically density.
NEXT STEPS
  • Study the derivation of the mass per unit length formula for cylindrical objects.
  • Learn about the relationship between tension and wave speed in different materials.
  • Explore the geometric implications of diameter on cross-sectional area.
  • Investigate the effects of material density on structural applications of wires.
USEFUL FOR

Students in physics or engineering disciplines, particularly those focusing on mechanics and material science, will benefit from this discussion. Additionally, anyone involved in the design or analysis of wire-based structures will find this information relevant.

nesan
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Homework Statement



http://puu.sh/frpk5/eae7bce2e3.png

Homework Equations



v = sqrt(T / (m / L));

The Attempt at a Solution



7.86 g / cm^3 = 7860 kg / m^3

T = v^2 * m/L

T = 160 ^ 2 * 7860 which is a huge number

I have no idea where the diametre plays a part.
 
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m/L ≠ 7860 (check the dimensions)
 
Nathanael said:
m/L ≠ 7860 (check the dimensions)
I'm sorry I really don't understand what you're aiming at. Does it have to do with the m^3?

I know it's mass per unit length but how would I go from 7860 kg / m^3 to what I need? Thank you.
 
nesan said:
I'm sorry I really don't understand what you're aiming at. Does it have to do with the m^3?
You were given the mass per volume, but you want to know the mass per length. You used the mass per volume where you should have used the mass per length.

nesan said:
I know it's mass per unit length but how would I go from 7860 kg / m^3 to what I need? Thank you.
Consider a steel wire with a larger diameter. (They are both steel, so the density is the same.) Which one will have the larger mass per length? Or will it be the same? And why?
 

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