Rotomolding (Questions 3 to 5 ) 3. (a)What are the keys steps in rotational molding? (5 pts.) (b) How does rotational molding compare to injection molding? Write any four ways you can compare the processing techniques. ( 5 pts.) 4. You are rotomolding a large children's toy with a very complicated shape and you have trouble getting good part definition and complete molding. You have a choice of resins having two melt indices. One is 30 and the other is 2 . Which would you choose and why? (2 pts.) 5. This question compares the rotational molding of high-density polyethylene (HDPE) and low density polyethylene (LDPE). Calculate the quantity of each powder you would need to prepare a spherical part with a 20cm diameter and a 0.5cm thickness (8pts. Given density of LDPE is 0.92g/cm3 and HDPE is 0.95g/cm3