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What is “undamped vibration absorption” ? What is “undamped vibration absorption” and how would you use this concept to absorb the vibration of a un-damped, simple mass spring system of mass m and stiffness k oscillating at its resonance frequency?

Why do we carry out stress transformations? tnx

this covers the confution I had, thank you verry much

What condition defines a principal stress? thx

as i have no idea how to do that, i would appreciate if some 1 can point me towered some worked out examples

Homework Statement [PLAIN]http://img840.imageshack.us/img840/553/unled0016.jpg Homework Equations The Attempt at a Solution can you sujjest me some articals to read (what knowladge do i need) before attemptiong this question?

i don't get it an I am confused can u do a quick run true and tell me they are same?

why dose using this equation gives me a different answer for passoinse ratio?

elongation D = (4*F*V)/(pi*Doriginal*E) is this a valid eqation??

Homework Statement question A ciclindrical metal specimen 10 mm in diameter is stressed elastically in tension. A force of 15000 N produces a reduction in diameter of 0.007 mm. Compute Poisson ratio if its elastic modulus is 100 GPa Homework Equations E=stress/strain The...

any one?

question A ciclindrical metal specimen 10 mm in diameter is stressed elastically in tension. A force of 15000 N produces a reduction in diameter of 0.007 mm. Compute Poisson ratio if its elastic modulus is 100 GPa my attempt D original = 0.01m change in D = 0.000007m F=15000N E=...