Concept explainers
Challenge yourself.
Planning an innovative house. A local electric company wants to build an experimental house that will conserve energy. Company officials believe the project breaks down naturally into the following tasks (the time required for each task is given in parentheses):
1. Draw plans for house (2 months)
2. Design energy systems for house (6 months)
3. Develop new insulation techniques (3 months)
4. Purchase land (4 months)
5. Build conventional shell of house (6 months)
6. Install new energy systems (2 months)
7. Install new insulation (1 month)
8. Finish the remaining conventional parts of the house (3 months)
9. Landscape (1 month)
10. Perform tests to determine energy usage in house (8 months)
Determine a reasonable list of dependencies for these tasks, then draw a PERT diagram and develop a schedule for these tasks. Answers will vary.
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
Mathematics All Around (6th Edition)
- parts a and b plewsearrow_forwardA municipal solid-waste site for a city must be located at Site A or Site B. After sorting, some of the solid refuse will be transported to an electric powerplant where it will be used as fuel. Data for the hauling of refuse from each site to the power plant are shown in Table P2-4. If the power plant will pay $8.00 per cubic yard of sorted solid waste delivered to the plant, where should the solid-waste site be located? Use the city’s viewpoint and assume that 200,000 cubic yards of refuse will be hauled to the plant for one year only. One site must be selected.arrow_forwardFarm Fact #3: In 2007, Massachusetts maple producers set 230,000 taps to collect sap, which, after boiling produced 30,000 gallons of maple syrup. It takes about 40 gallons of sap to produce one gallon of syrup." And "Suppose the sap is collected in gallon buckets that hang under each tap, and the maple season lasts one month? And "Read the label of a "pancake syrup" bottle to find out how much maple syru it contains." How many gallons of syrup did each tap yleld? How many gallons of sap did each tap yield? What extra information would you need ot estimate the number of sugar maple trees that were tapped? How many times a day (how often) will the buckets of sap need to be emptled? (What fraction of a bottle of generic "pancake syrup" is pure maple syrup?) What fraction of the cost of generic "pancake syrup" can you attribute to the cost of pure maple syrup?arrow_forward
- Transformers for underground works were planned to be provided. Type A has an initial cost of $70,000 and a life of 8 years. Type B has an initial cost of $95,000 and a life expectancy of 12 years. The annual operating cost for type A is expected to be $9000, while the AOC for type B is expected to be $7000. Salvage values are $5000 for type A, and $10,000 for type B. Using the incremental cash flow analysis, choose the better alternative.arrow_forwardFor a particular process, originally each 200 units of product manufactured yielded 180 conforming units, 9 units that must be scrapped, and the remaining units that must be reprocessed. Each scrapped unit results in a $30 loss and each reprocessed unit requires an extra 0.30 hours of processing time. The resource time of producing the original 200 units is 30 hours. As a result of a quality improvement program that was recently introduced, for each 200 units manufactured, the process now yields 190 conforming units, 1 unit to be scrapped, and the remaining units that must be reprocessed. Calculate the scrap cost for the new process.arrow_forwardAn Jibble is produced on an assembly line consisting of six workstations. The total work content for one Jibble is 22 minutes based on the following standard times set forth for each station: 1 (4.0 minutes), 2 (6.5 minutes), 3 (4.0 minutes), 4 (2.5 minutes), 5 (2.0 minutes), 6 (3.0 minutes). If this assembly line runs 5 days per week, 8 hours per day and each station operator operates at 120% of standard, how many Jibbles can be produced in a week? a. Greater than or equal to 600 units. b. Greater than or equal to 500 units but less than 600 units. c. Less than 400 units. d. Greater than or equal to 400 units but less than 500 units.arrow_forward
- Please see attachedarrow_forwardPLEASE ANSWER THIS QUESTION WITHIN 30 MINUTES. I WIL UPVOTEarrow_forwardA hurricane has been predicted to make landfall in Louisiana. The counties that lie within the path of the storm along with current population estimates are given in Table 1 below. There are several regional warehouses located in Texas, Alabama and Georgia that have capacity available to lease so that supplies can be prepositioned in advance of the storm. The lease capacity available at each of the warehouses is 100,000 units of MREs (meals ready-to-eat). The cost to lease each warehouse along with the capacity available is displayed in Table 2. The distance (in miles) to ship product to each of the counties from each possible warehouse location is summarized in Table 3. Assume travel cost is proportional to distance traveled. Formulate a mathematical model that will determine which of the warehouses to use to preposition MREs and the amount shipped from each warehouse to each of the counties to assist those who are in need after the storm. Assume that 25% of the population will…arrow_forward
- A-5arrow_forwardPlease answer C. and D. Palisades Eco-Park is a small ecological reserve that admits a relatively small number of visitors on any day, but provides both educational and entertaining lectures, exhibitions, and opportunities to observe nature. The company has collected the following data on labor costs and number of visitors to the park over the last 30 months. Month Labor Cost Visitors 1 $ 25,820 1,700 2 $ 36,290 2,592 3 $ 39,968 2,811 4 $ 31,648 2,222 5 $ 34,809 2,373 6 $ 32,672 2,181 7 $ 32,023 2,205 8 $ 38,334 2,676 9 $ 38,568 2,760 10 $ 46,933 3,572 11 $ 42,157 2,976 12 $ 39,030 2,804 13 $ 34,444 2,415 14 $ 33,173 2,336 15 $ 36,971 2,508 16 $ 26,500 2,099 17 $ 30,663 3,397 18 $ 29,961 2,786 19 $ 27,590 2,412 20 $ 30,003 2,972 21 $ 25,692 2,000 22 $ 24,655 1,794 23 $ 28,892 3,267 24 $ 30,153 3,817 25 $ 28,119 2,592 26 $ 31,690 3,274 27 $ 28,651 2,989 28 $ 29,927 3,050 29 $ 28,438 2,511 30 $ 27,874 2,075…arrow_forwardThe population of Boomtown is currently 2000 and expected to grow by 2.7% over the next year. What will its population be by then? The population of Dullsville, on the other hand, is currently 14000 and expected to decrease by 3.7% over the next year. What will its population be by then?arrow_forward
- Discrete Mathematics and Its Applications ( 8th I...MathISBN:9781259676512Author:Kenneth H RosenPublisher:McGraw-Hill EducationMathematics for Elementary Teachers with Activiti...MathISBN:9780134392790Author:Beckmann, SybillaPublisher:PEARSON
- Thinking Mathematically (7th Edition)MathISBN:9780134683713Author:Robert F. BlitzerPublisher:PEARSONDiscrete Mathematics With ApplicationsMathISBN:9781337694193Author:EPP, Susanna S.Publisher:Cengage Learning,Pathways To Math Literacy (looseleaf)MathISBN:9781259985607Author:David Sobecki Professor, Brian A. MercerPublisher:McGraw-Hill Education