What is replication? Why do we need replication in an experiment? Present

Question 6. Calculate the average molecular weight Mm for a thermoplastic that has the following weight fractions fi for the molecular weight ranges listed:(5 points)

The axisymmetric part shown in the accompanying figure is to be produced from fine copper powder and is to have a tensile strength of150 MPa. Determine the compacting pressure and the initial volume of powder needed 25Dimensions in mm해야12-20→25

Question 7. The nose cap and the wing leading edges of the space shuttle may reach temperatures of up to1650°C. (a) Would the silica fiber compound (HRSI) be a suitable candidate for these sections of the shuttle?(b) If not, select a suitable material for this location. (c) List the important properties of the selected material that satisfy the design needs.(5 points)

Question 9. (a) What are the three major reactions that occur during chain polymerization?(b) What are two methods by which a linear chain polymerization reaction can be terminated? (5 points)

Report: 1. (15 points) Introduce your literature review topic and explain why you find it interesting. Describe the importance of this research field and its trending in the near future based on your research. 2. (60 points) Describe the methods, materials, experiments, results and conclusions of each article related to the specific topic you selected. Cite figures, charts and tables when necessary. 3. (20 points) Summarize all the articles and describe the improvements made by each work to the review topic. If you were given the opportunity to research on this field, what interests you the most? What are the challenges of this research topic you selected and how would you conduct your research? 4. (5 points) Follow the format and structure guidelines given below.

Report: 1. (15 points) Introduce your literature review topic and explain why you find it interesting. Describe the importance of this research field and its trending in the near future based on your research. 2. (60 points) Describe the methods, materials, experiments, results and conclusions of each article related to the specific topic you selected. Cite figures, charts and tables when necessary. 3. (20 points) Summarize all the articles and describe the improvements made by each work to the review topic. If you were given the opportunity to research on this field, what interests you the most? What are the challenges of this research topic you selected and how would you conduct your research? 4. (5 points) Follow the format and structure guidelines given below.

Question 4. An austenitized 4340 standard steel bar is cooled at different rates (see Figure 2).Predict what will be the constituents in the microstructure of the bar at 200°C for the following cooling rates:(6 points) (a) 5°C/s (51-mm from the quenched end of a Jominy bar) (b) 8°C/s (19.0-mm from the quenched end of a Jominy bar) (c) 50°C/s (9.5-mm from the quenched end of a Jominy bar)