V.Give a simple answer to the following questions(10points) 1.(3pts)What are polymers,homopolymers and copolymers?And another name for polymer is 2.(4pts)Figure 1 is Graphical plot of the tensile modulus of a unidirectional composite material loaded under iso-strain iso-stress conditions as a function of volume fraction of reinforcing fiber. (1)Which curve is for iso-strain loading,which curve is for iso-stress loading? (2)Draw a sketch to show iso-strain loading. (3)Under iso-strain loading,the modulus of elasticity can be calculated by cquation (4)Under iso-stress loading,the modulus of elasticity can be calculated by equation voaa密 3.(3pts)Explain why carbon fiber reinforced composites are widely used in manufacturing airplane. VI.Complex questions.(20pts) 1.Predict which polymer in each pair listed can have higher degree of crystallinity, and justify your answers.(12 pts) 1 PE or Polystyr ene(PS) LDPE o or HDPE H(CHs)]or isotactic [(CH)] (6)Cooling molten PP to form solid PP under high cooling rate or under low cooling rate 2.What is a fiber-reinforced composite primary composed of?Discuss the major functions of each component in a composite?Discuss the factors which affect the properties of fiber-reinforced composites.(8)7 V. Give a simple answer to the following questions (10points) 1. (3pts) What are polymers, homopolymers and copolymers? And another name for polymer is ? 2. (4pts) Figure 1 is Graphical plot of the tensile modulus of a unidirectional composite material loaded under iso-strain & iso-stress conditions as a function of volume fraction of reinforcing fiber. (1) Which curve is for iso-strain loading, which curve is for iso-stress loading? (2) Draw a sketch to show iso-strain loading. (3) Under iso-strain loading, the modulus of elasticity can be calculated by equation . (4) Under iso-stress loading, the modulus of elasticity can be calculated by equation . 3. (3pts) Explain why carbon fiber reinforced composites are widely used in manufacturing airplane. VI. Complex questions. (20pts) 1. Predict which polymer in each pair listed can have higher degree of crystallinity, and justify your answers. (12 pts) (1) PE or Polystyrene (PS) (2) LDPE or HDPE (3) PE or Nylon (4) Atactic [C2H3(CH3)]n or isotactic [C2H3(CH3)]n (5) isotactic (C2H3Cl)n, or isotactic [C2H3(CH3)]n (6) Cooling molten PP to form solid PP under high cooling rate or under low cooling rate 2. What is a fiber-reinforced composite primary composed of? Discuss the major functions of each component in a composite? Discuss the factors which affect the properties of fiber-reinforced composites. (8)