Question Solved1 Answer Consider the four plastic molding presses of Example 6-2. Suppose that each press is still capable of producing 120,000 total units per year, but the estimated reject rate is different for each alternative. This means that the expected revenue will differ among the alternatives since only non-defective units can be sold. The data for the four presses are summarized below. The life of each press (and the study period) is five years. Press P1 P2 P4 Capital investment $24,000 $30,400 $49,600 $52,000 Total annual expenses $31,200 $29,128 $25,192 $22,880 Reject rate 8.4% 0.3% 2.6% 5.6% P3 If all non-defective units can be sold for $0.375 per unit, which press should be chosen? Solve for PW, AW, and FW with a MARR of 5% of each press.

(b) If real GDP were initially $900, what would tend to happen to consumption expenditure and why? Expenditure (E) 1000 900 Possible equilibrium points E=Y C+I+G+NX 0 100 200 300 400 500 600 700 800 900 1000 GDP (Y)

13. How shifts in demand and supply affect equilibrium Consider the market for pens. Suppose that the number of students with an allergy to pencil erasers increases, causing more students to switch from pencils to pens in school. Moreover, the price of plastic, an important input in pen production, has dropped considerably. On the following graph, labeled 13. How shifts in demand and supply affect equilibrium Consider the market for pens. Suppose that the number of students with an allergy to pencil erasers increases, causing more students to switch from pencils to pens in school. Moreover, the price of plastic, an important input in pen production, has dropped considerably. On the following graph, labeled Scenario 1, indicate the effect these two events have on the demand for and supply of pens. Scenario 1 10 Supp Demand Supply mand 1 3 5 7 9 10 QUANTITY (Millions of pens)

A 20-mm-diameter rod made of the same material as rods AC and AD in the truss shown was tested to failure and an ultimate load of 145 KN was recorded. Use a factor of safety of 3.0. 7 1.5 m D RON B C - 3 m - 3 m 48 KN 48 KN Determine the required diameter of rod AC. The required diameter of rod AC is mm.

2.54x10-3 25 4.93x10-3 35 7.64x10-3 42 1.23x10-2 50 1.47x10-2 53 It is known that the variation of the rate constant k with the absolute temperature T is described by the Arrhenius equation: k = A exp [(-E₂ )/(RT)] where E, is the activation energy, R is the universal gas constant and A is the pre-exponential factor (units of the rate constant). Taking the 2.54x10-3 25 4.93x10-3 35 7.64x10-3 42 1.23x10-2 50 1.47x10-2 53 It is known that the variation of the rate constant k with the absolute temperature T is described by the Arrhenius equation: k = A exp [(-E₂ )/(RT)] where E, is the activation energy, R is the universal gas constant and A is the pre-exponential factor (units of the rate constant). Taking the natural logarithm of both sides affords: Ea In k = In A - RT For a plot of y = In k versus x = 1/T, calculate the slope of the best straight line using linear regression. 1 pts Submit Answer Tries 0/99 Calculate the activation energy E₂. 1 pts Submit Answer Tries 0/99 Copyright: Department of Chemistry, Simon Fraser University - ⒸSFU Chemistry 2020-2022

java Open-Ended 1 (manual) Consider the following statements about Java programs: • Statement A: In Java, two different classes can define a field with the same name and type. Statement B: In Java, one class can define two fields with the same name as long as they have different types. Statement C: In Java, two different methods in the same class can have the same parameter name, and arguments passed to one of those methods don't affect the parameter in the other. For each, write a small Java program that demonstrates whether it is true or false. Put them in the files Open1A.java, Open18.java, and Openic.java. To show that a statement is true, write a Java program that matches the statement, doesn't produce an error when run, and produces some meaningful output when ./run. This means you may want to include an examples class with some instances of the classes you create to demonstrate this. To show that a statement is false, write a Java program that matches the statement and produces an error when run, demonstrating that Java programs cannot do what the property says. Include both the program and a screenshot of running the program without error as your submission; the template has space for both of these. Open-Ended 2 (manual) Create a class named R that has a field of type String and a field of type R. Give it a default constructor that initializes both fields. Put the class in a file called Examplesr.java. Add an Examples class to this file, and answer the following questions in that file: 1. Construct an example R object. Were you able to? Explain your example if you were able to, and explain why you think it's not possible if you weren't. 2. On Twitter, it's possible to reply to a reply to a Tweet (that's not a typo, it's a reply to a reply). This is true of many systems, like email, Facebook comments, Piazza followups, and so on. With the class structure in Dri113 with ReplyTweet and Text Tweet (that is, without changing the fields as described above), could you construct an example of a reply to a reply to a Tweet? Why or why not?

3 An experiment can result in one or both of events A and B with the probabilities shown in this probability table: AC B. BC A 0.3 0.18 0.4 0.12 Find the following probabilities: a. P(A) b. P(B) c. P(ANB) d. P( AB) e. P(BIA)