Materials Assignement 4 Attempt 2

# Materials Assignement 4 Attempt 2 - WebCT Quiz Homepage...

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_06_newRestore/s. .. 1 of 3 09/03/2006 2:02 AM View Results Name: BRYCE JONES Attempt: 2 / 3 Out of: 12 Started: March 8, 2006 10:02pm Finished: March 9, 2006 2:00am Time spent: 3 hr, 57 min., 51 sec. Question 1 (1 point) For most metals, the relationship between the elastic and shear moduli is approximately: Student response: Correct Response Student Response Answer Choices a. G = 0.1 E b. G = 0.2 E c. G = 0.3 E d. G = 0.4 E e. G = 0.5 E General feedback: For most metals, G is approximately equal to 0.4 E . Score: 0 / 1 Question 2 (1 point) What is the Brinell hardness (in HB) of a typical steel that has a tensile strength of 1277 MPa? Use decimal notation, digits after decimal: 0 Student response: 370 HB Correct answer: 370 HB General feedback: A good approximation of the Briness hardness for most steels can be found by dividing the tensile strength of the material by a factor of 3.45. For more information, see the section in the text on Hardness . Score: 1 / 1 Question 3 (1 point) A cylindrical bar of metal having a diameter of 4.36 mm and a length of 608 mm is deformed elastically in tension with a force of 10934 N. Given that the elastic modulus and Poisson's ratio of the metal are 151 GPa and 0.35, respectively, determine the change in diameter of the specimen (in mm). Indicate an increase in diameter with a positive number and a decrease with a negative number. Use scientific notation, significant figures in answer: 3 Student response: -7.40e-3 mm Correct answer: -7.40E-3 (-7.40 * 10 -3 ) mm General feedback: The stress for a cylindrical specimen is equal to: In this case, the stress value is longitudinal. You can calculate the transverse strain by finding the longitudinal strain (using Hooke's

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Materials Assignement 4 Attempt 2 - WebCT Quiz Homepage...

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