Strength to Weight & Modulus to Weight

  • Thread starter CRich
  • Start date
  • #1
CRich
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Homework Statement


σ=230MPa (tensile strength)
E=15GPa (modulus)
ρ=1.85 g/cm^3 (density)



Homework Equations



Strength/Weight = σ/ρ
Modulus/Weight = E/ρ

The Attempt at a Solution



Strength/Weight = σ/ρ = 230x106 N/m2 / 1850 kg/m2
= 124324.32 (Units?) ___Shouldn't this be unit less?

Modulus/Weight = E/ρ = 1.5x10 10 N/m2 / 1850 kg/m2
= 8108108.108 (Units?) ___Shouldn't this be unit less?

____Any help is appreciated, thank you__
 

Answers and Replies

  • #2
PhanthomJay
Science Advisor
Homework Helper
Gold Member
7,179
513
Units are Nm/kg using mass density. Or if you use weight density,
the
units are length units (meters or feet or inches, etc)
 

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