1M03 2009 ASSIGNMENT 4-1 ¿¯

1M03 2009 ASSIGNMENT 4-1...

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View Results Name: SOO NAM Attempt: 1 / 3 Out of: 19 Started: February 25, 2009 11:59am Finished: March 9, 2009 10:44pm Time spent: 297 hr, 45 min., 16 sec. Question 1 (1 point) Which of the following is the correct ranking of typical polymeric, ceramic, and metallic materials relative to their modulus of elasticity values? Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. Ceramics < metals < polymers 0.0% b. Ceramics < polymers < metals 0.0% c. Metals < polymers < ceramics 0.0% d. Metals < ceramics < polymers 100.0% e. Polymers < metals < ceramics 0.0% f. Polymers < ceramics < metals General feedback: The atomic bonding of the material has a direct influence on its modulus of elasticity; thus, the correct ranking of the three material types relative to modulus of elasticity is polymers < metals < ceramics . Score: 0 / 1 Question 2 (2 points) A specimen of a metal has a rectangular cross section of 11.5 mm x 13.0 mm. It's pulled in tension with a force of 34272 N, which produces only elastic deformation. Given that the elastic modulus of this metal is 69.7 GPa, calculate the resulting strain . Use scientific notation, significant figures in answer: 3 Student response: 3.29e-3 Correct answer: 3.29E-3 (3.29 * 10 -3 ) General feedback: Hooke's law is: The applied stress is equal to: Remember to watch your units. For more information, see the section on Stress-Strain Behaviour in the text. Score: 2 / 2 Question 3 (2 points) A cylindrical specimen of a metal alloy 6.7 mm in diameter is stressed in tension. A force of 11.4 kN produces an elastic reduction in the specimen's diameter of 0.016 mm. Calculate the elastic modulus (in GPa) of this material if its Poisson's ratio is 0.35. Use decimal notation, digits after decimal: 0 Student response: 47 GPa
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Correct answer: 47 GPa General feedback: Poisson's ratio is which is the negative ratio of transverse (x and y) and longitudinal (z) strains. The transverse strain (x or y) for a cylinder of diameter
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1M03 2009 ASSIGNMENT 4-1...

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