Discussion-18

# Discussion-18 - Elastic ElasticDeformation Discussion#18...

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astic Deformation Elastic Deformation Discussion #18 – Ch. 10.7 & 10.8 Physics 125–Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] ffice Hours: 2:00 :00 / Mon & Tue Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Example #1 Compressive strength of our bones is important in everyday life. Young’s modulus for bone is about 1.4×10^10 N/m^2. Bone can take only about a 1.0% change in its length before fracturing. What is the maximum force that can be applied to a bone 4 . 1.5 10 × whose minimum cross-section area is 3.0 cm^2? (This is approximately the cross- section area of a tibia, or shin bone, at its narrowest point.) A. 1.5 10 N 4 B. 7.3 10 N × 4 C. 2.8 10 N × 4 D. 4.2 10 N ×
Example #2 Hooke’s law for a tensile stress can be written as F x =kx, where x is the object’s change in length, and k is the force constant. Write the force constant, k, in rms of the rod’s original length L cross ection rea and the Young’s terms of the rod s original length, L 0 , cross section area, A, and the Young s modulus, Y.

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## This note was uploaded on 12/08/2011 for the course PHYSICS 125 taught by Professor Unknown during the Fall '08 term at University of Michigan.

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Discussion-18 - Elastic ElasticDeformation Discussion#18...

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