4. Consider the following manufacturing processes: • Injection molding • Rotomolding • Thermoforming • Extrusion • Blow molding For each of the following products (figures on next page), select the appropriate manufacturing process and indicate why this process would be appropriate: a. Plastic water bottle b. Plastic Straw c. Clamshell case for food leftovers Example: d. Large recycling bin e. Invisalign orthodontic appliance f. Plastic shelf with reinforcing ribs Plastic 1-gallon milk carton: blow molding-high volume (i.e. thousands of cartons produced), only 1- sided accuracy required, hollow. a. Plastic water bottle b. Plastic Straw (three shown) C. Clamshell case for food leftovers d. Large recycling bin (blue body portion) Max 825.1 psi Mn: 2.068 psi 435.7 psi e. Invisalign orthodontic appliance f. Plastic shelf with reinforcing ribs

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Please do the last three questions (2, 3 and 4)! Thank you in advance!  A seesaw that weights 45lbs and its 5m long is balanced on the fulcrum in the center.  1- Two children are sitting on opposite sides of each other on the seesaw. One child weights 50lbs and is sitting 0.7m on the left end. Where should the other child sit in order to be balanced on the seesaw if they weigh 42lbs?  2- Now, a third child wants to sit on the seesaw and weighs 30lbs and is sitting 1.25m in front of them and is closer to the fulcrum on the right side. What are the CW and CCW moment of the seesaw now? What is the net moment and direction?  3- Then, a fourth child wants to play on the seesaw and is on the left side of the plank in order to bring the system to equilibrium. How much does the child weigh (Calculate the pounds of force needed in order for rebalance?)  4- Now the fourth child leaves the other three children sitting on the plank. If the three children are sitting in the same potions as they did…