A wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 30 MPa (m) 1/2 . It has been determined that fracture results at a stress of 120 MPa when the maximum internal crack length is 8.4 mm. For this same component and alloy,

Compute the stress level at which fracture will occur for a critical internal crack length of 5.6 mm?

Design a steel flexural member that is continuously braces and 12 feet long. There is a uniformly distributed live load of 1 k/ft, and uniformly distributed dead load of 1 k/ft and a concentrated live load of 8.4 kips at a distance of 5 feet from the left support. use 36 ksi steel.

Ethics Class

Chapter 14 Discussion questions:

Discuss bioethics? Discuss health care professionals and patients & their families-rights & obligations. Discuss truth telling and informed consent. Discuss intercultural bioethics. Discuss ethical issues in medicine. Discuss human experimentation.

There are concrete structures and projects in the following, try to select the proper cement and explain the reason
1/Cast in place beam
2/The prefabricate parta conserved by autoclave method
3/Urgent salvaging projects or urgent military engineering
4/Mass concrete dam and the Foundation fpr large scale equipment
5/The underground Engineering that can be corroded by sulfate
6/The basis for blast furnace

Describe the distinction between Balloon Framing & Platform. 250 words, please.

A CMFR will be used to reduce the concentration of chloroform(CHCl3) in water. Chloroform is a disinfection by-product that is formed when chlorine is used to disinfect water; it is a concern because it can cause cancer.The influent water contains 60 ppb chloroform and the Wisconsin State standard is 6 ppb. Chloroform decays in the reactor at a rate of 0.2 hr-1 and the water flow rate is 100 L/day.

Treating the water to meet the Wisconsin standard will reduce the lifetime cancer risk for ingesting the water to 10-5.Although this is within the range of the EPA risk guidelines (10-4to 10-7), the public is concerned about the presence of a carcinogenic compound in their water. Determine the size (in L) of the reactor necessary to achieve (a)a risk of 10-5(6 ppb) and (b)a risk of 10-7(0.06 ppb).How do the two reactors compare? Do you think it will be worth the extra cost to reduce the risk from 10-5to 10-7?

Required: write a summary between 90 and 120 words for the following task.

Task A

What makes a work of architecture great? Most people would say that aesthetics are most important. For example, many people agree that the Eiffel Tower in Paris and the Blue Mosque in Istanbul are beautiful structures. It is true that aesthetics are important; however, according to the Roman architect Marcus Vitruvius Pollio, there are two additional principles that we should consider when judging a structure. They are durability—how strong and long-lasting a structure is designed to be—and function— how well the structure serves its intended purpose. The new Rostonville Library in my city is a good example of Vitruvius's principles because it is durable, functional, and aesthetically pleasing.

The Rostonville Library, which is built entirely of granite—a hard and very tough stone—is an example of durability. Granite is likely to remain strong and unaffected by environmental pollution. The copper color offers an interesting contrast to the light gray color of the granite structure, and the contrast will remain as the copper ages.Granite structures are stable and resistant to vibrations, so the Rostonville Library will likely be able to withstand an earthquake. The Rostonville Library is also durable in terms of sustainability, because it uses solar energy for heating, and a rooftop garden provides insulation that keeps the building cool in hot weather.

Designed to provide free access for members of the community to a variety of print and digital information, the Rostonville Library is also an example of Vitruvius’s principle of functionality. The Rostonville Library conveys a feeling of openness and accessibility. For example, it is resistant to acid rain.Furthermore, the entire library is on one level, and it has an open design—there are no interior walls or dividers. In addition, large windows let in plenty of natural lights, so it’s easy to see and get to each department within the library.

Finally, the Rostonville Library is beautiful. Aesthetically pleasing details make it attractive, both inside and out. The large windows are framed in copper. For example, it has large double doors that are at street level; there are no stairs at the entrance. Growth from the rooftop garden, which cascades down the sides of the building, adds to the aesthetics of the building. It softens the lines of the structure and helps it to blend into its natural surroundings.

Durability, functionality, and beauty make the Rostonville Library a great structure. Architects and designers follow Vitruvius's principles help to make urban environments more pleasant places to live. Structures that exemplify these criteria provide peace of mind as well as beauty for the people who use them.

Discuss the salient features of Chapters Two, Three and Eight of Building Fire Prevention and Protection requirements (BFPPR), Document no. 77/2002 by Directorate General of Civil Defense??

What thickness of a concrete masonry wall with limestone aggregate provides a fire-resistance rating of 5.0?

What are filters? How they are used for reclassification process.

For a moist soil sample the following are given: Total volume = 1.15 m3 Total mass = 2300 kg Moisture content = 7.4 % Gs = 2.69 Determine the following: 1. Moist unit weight (γwet) 2. Dry unit weight (γd) 3. Void ratio (e) and Porosity (n) 4. Degree of saturation (Sr) 5. Volume of water in the soil sample

Design a concrete mix by using ACI Method of Mix Design having 28-day characteristic mean strength of 28 MPa for a deck of a residential building at Nebraska. Dry weather and gradually warming temperatures may be expected throughout the working week. Fresh concrete composed of a slump of 90 mm and maximum aggregate size of 25 mm. Determine the amount of water reducing admixture to be used for 0.24 % and 0.35 %. Deck is a flat surface capable of supporting weight, similar to a floor, but typically constructed outdoors, often elevated from the ground, and usually connected to a building. Decks that need piers or footings must have them installed below the frost line. This will keep the piers from heaving up out of the ground from the strength of the freeze. Reinforcing steel will help keep the piers from cracking.  The freeze or frost line is the depth to which the soil freezes or has been known to freeze at some point in the past. It is absolutely critical that the foundations of buildings extend below this point in a soil profile. Except for a few arid locations, soils typically contain water and this water expands approximately nine percent in volume when it freezes. The frost line depth is not consistent around the nation because there is such a dramatic difference in climate from state to state. Deck is composed of 2.5 cm reinforcement and there is no need for piers. The material properties are as follows:

For Coarse aggregate: SSD bulk specific gravity: 2.75, absorption capacity = 1.5 %, total moisture: 2.5 %, Dry-rodded unit weight: 1587 kg/m³.

For Fine aggregate: SSD bulk specific gravity: 2.65, absorption capacity = 1.0 %, surface moisture: 3 %, F.M: 2.6.

Cement: Type V, Sp.Gravity: 3.23

Probability constant: 1.22 and standard deviation: 2 MPa

3. a) A trapezoidal open channel is being designed to convey a discharge of 11.0 m3/sec. The channel will be excavated into clay and will have the following properties: side slope of m = 1.5, the bottom slope of So = 0.001, Manning’s n = 0.022, and bottom width b = 1.0 m. For these conditions is there a risk of channel erosion?

b) The earth-works contractor that will carry out the excavation suggests that the side slope angle can be increased to 45o (i.e. m = 1). Comment on the impact that such a change would have on 1) the required depth of excavation, and 2) the risk of erosion.

c) Calculation of the normal depth using Manning’s equation does not consider freeboard.

I need help with this question. Please help me, Thank you!