UT Arlington PHYS 1441 - Lecture Notes (13 pages)

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Lecture Notes



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Lecture Notes

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Pages:
13
School:
University of Texas at Arlington
Course:
Phys 1441 - General College Physics I
General College Physics I Documents

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PHYS 1441 Section 002 Lecture 24 Wednesday Dec 8 2010 Dr Jaehoon Yu Elastic Properties of Solids Density and Specific Gravity Fluid and Pressure Depth Dependence of Pressure Absolute and Relative Pressure Pascal s Principle and Hydraulics Buoyant Forces and Archimedes Principle Wednesday Dec 8 2010 PHYS 1441 002 Fall 2010 Dr Jaehoon Yu 1 Announcements The Final Exam Date and time 11am 1 30pm Monday Dec 13 Place SH103 Comprehensive exam Covers from CH1 1 CH10 7 Plus appendices A 1 A 8 Combination of multiple choice and free response problems Submit your Planetarium extra credit sheet Wednesday Dec 8 2010 PHYS 1441 002 Fall 2010 Dr Jaehoon Yu 2 Young s Modulus Let s consider a long bar with cross sectional area A and initial length Li Li Fex After the stretch A cross sectional area F Tensile Stress ex A Tensile stress Young s Modulus is defined as Y Lf Li L Fin Fex Fin Tensile strain Tensile Strain F ex Tensile Stress A Tensile Strain L L Fex L Li Used to characterize a rod or wire stressed under tension or compression i What is the unit of Young s Modulus Experimental Observations 1 2 Force per unit area For a fixed external force the change in length is proportional to the original length The necessary force to produce the given strain is proportional to the cross sectional area Elastic limit Maximum stress that can be applied to the substance before becomes permanently Wednesday Dec 8 it 2010 PHYS 1441 002 deformed Fall 2010 Dr Jaehoon Yu 3 Bulk Modulus F Bulk Modulus characterizes the response of a substance to uniform squeezing or reduction of pressure V After the pressure change F V F F Normal Force F Volume stress Pressure Surface Area the force applies A pressure If the pressure on an object changes by P F A the object will undergo a volume change V F Bulk Modulus is defined as Because the change of volume is reverse to change of pressure Wednesday Dec 8 2010 P Volume Stress A B V V Volume Strain Vi Vi Compressibility is the reciprocal of Bulk Modulus PHYS



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