OLD_%20Fall2006_biomaterials_exam

OLD_%20Fall2006_biomaterials_exam - YOUR NAME:_ FALL 2006...

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YOUR NAME:________________________________________________________________ FALL 2006 EBME 105 Exam #1 Biomaterials September 27, 2006 You must work alone during exams. All exams will be in class and closed-book (no books, notes, class handouts, or other papers). Calculators may be used during exams. All programmable calculators must be cleared of programs before entering the examination room. All memories, registers, or other means of storing alphanumerical information in any calculator must be cleared before entering the examination room. During the exam, discussion or communication with others is forbidden (except the instructors or teaching assistants). Both the student who provides information and the student who receives information during an exam are guilty of unethical conduct. No books, notes, class handouts, or other papers are allowed. Calculators are allowed. Your answers should be brief. Use your time effectively.
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YOUR NAME:________________________________________________________________ 1A. (4 points) Draw a graph that reflects the polydispersity of a typical natural biopolymer and a synthetic biopolymer. Label the axes of each graph. Natural biopolymers should have subunits all with the same molecular weight. However synthetic biopolymers are usually polydisperse. 1B. (2 points) Based on your graphs, qualitatively describe the relative differences in the number-average molecular weight (Mn) for the natural biopolymer and synthetic biopolymer as described by your graphs. Although this depends on your graphs above the number average molecular weight could potentially be the same if your synthetic biopolymer had a symmetric distribution as ours above does. 1C. (2 points) Based on your graphs, qualitatively describe the relative differences in the weight-average molecular weight (Mw) for both polymers for the natural biopolymer and synthetic biopolymer as described by your graphs. Again depends on the above graphs, but since higher molecular weight polymers have a greater impact on weight-average molecular weight the synthetic polymer will have a greater weight averaged weight for the samples we showed above.
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YOUR NAME:________________________________________________________________ 2A. (8 points) A ligament is stretched (becomes longer) and tears along the direction shown in the diagram below. Draw & label arrows to indicate the stress and shear stress. Draw & label arrows and lines to indicate the change in length that represents strain and shear strain. To clearly show all of your work, you may redraw the diagram in the space provided if needed. 2B. (2 points) Discuss the relative values of the fracture strengths that are parallel and perpendicular to the tear in the ligament. The fracture strength of the ligament in the direction that is parallel to the tear is much less than
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OLD_%20Fall2006_biomaterials_exam - YOUR NAME:_ FALL 2006...

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