1. Using pictures and/or diagrams describe and explain four (4) basic modes of rock failures and the factors contributing to pit slope instability. (12 points)

Please type your answer, Please do not write on the paper and post it (minimum 2 page)

• Why do metals initially exhibit only elastic deformation under low loads?

• What causes metal plastic deformation to begin at higher stress levels?

• What occurs in metals on the atomic level that causes plastic deformation at high stress?

• What occurs in molten metals when they cool and solidify, both initially and then later?

design for british code 8110

1.A 500 mm square column carries a dead load of 1200 kN and imposed load of 400 kN. The safe bearing capacity of the soil is 180 kN/m². Design a square pad footing to resist the loads using the following material strengths: f_cu=30 N/mm², f_y=500 N/mm².

2.Design a pad footing for a rectangular column of section 300x500 mm supporting an axial factored load of 1,400 kN. The safe bearing capacity of the soil is 180 kN/m². Use f_cu= 20N/mm², f_y= 415 N/mm².

What are the steps of design process in architecture and explain each one?

A well-mixed sample (volume = 30 mL) of mixed liquor from an aeration tank of an activated sludge wastewater treatment plant was divided into two halves. The first half was filled in a 22.285 g crucible and placed in a drying oven at 105°C for 24 hours. The weight of the crucible and the residue after drying was 22.344 g. The crucible was then placed in a furnace at 550 °C for 30 minutes. After that the crucible with the ash weighed 22.310 g. The second half was filtered through a 0.151 g glass-fiber filter. After that the filter was placed in a drying oven at 105°C. The weight of dried filter with the residue was 0.196 g. The filter was then placed in a furnace at 550 °C for 30 minutes. After that the filter with the ash weighed 0.167 g.

a) Calculate (in mg/L): Total Solid (TS), Total Suspended Solid (TSS), Total Dissolved Solid (TDS), Total Volatile Solid (TVS), Volatile Suspended Solid (VSS), and Volatile Dissolved Solid (VDS).

b) Which value could be assumed the microorganism concentration in the aeration tank (X)

c) If the influent of the aeration tank of this activated sludge plant has a flow rate of 0.1 m3 /s, find the volume of the tank, if the required detention time is 2 hours.

d) In the influent BOD5 is 95 mg/L, find the food to microorganism ratio (F/M) for this activated sludge plant in ?? ??∙? . e) If a 2- Liter graduated cylinder was filled by an activated sludge sample from the same plant and the settled volume after 30 minutes was 800 mL, find the SVI.

Construct a precedence diagram (AON) b) On the diagram, compute the four activity dates (ESD, EFD, LSD, and LFD) and the floats (TF and FF) for each activity. c) Identify critical event(s), critical activities, and critical path(s) Please calculate and show results on the diagram in the following form: Act Time Predecessors B 5 - M 4 B N 9 B P 8 B L 6 M F 5 M,N C 8 N,P K 6 P G 7 L,F,C A 3 F,C D 7 C,K E 13 K H 3 G,A J 2 D,E,H

what a spatial model is by using some examples of real-world entities and how they could be modeled in GIS (e.g. the city of Denver could be modeled as a vector point in a map of the US or as a vector polygon area in a map of Colorado). What are the limitations of the spatial data models with regard to your example?

Assume you have a coal fired plant that produces 300 MW. The plant is 30% efficient. There is 0.2 lbs. of sulfur produced per BTU. There is 5% residual ash created. Assume you live 4km downstream to the plant. Its is a cloudy summer night with wind of 2.5 m/s. The effective stack height is 100m

1. What is the feed rate of coal to the plant (lbs. per hour)?
2. How much sulfur is produced per hour?
3. What is the concentration of sulfur at your house? - list all assumptions you use
4. Assume the concentration is too high, what should you do?
5. How much ash is produced per day
6. If you have decided to build an ash landfill that can hold 256 years’ worth of ash at the current rate of production, and the coal ash density is 100lbs/cy, how many cubic yards of landfill space must be created?
7. At a cost of $50 per ton of excavation. How much will the landfill excavation cost?

4. The composition of the Earth’s atmosphere has changed in the past 200 years. What are/were the major changes in our atmospheric composition?

A national laboratory has stated that they are responsible for a ceramic machining program that intends “to provide measurement methods, data, and mechanistic information needed by industry to develop innovative cost-effective methods for machining advanced structural ceramics.” Grinding with diamond wheels is the most prevalent method of machining advanced ceramics. This machining is highly complex and depends on many interdependent factors. The major elements of a grinding system are the grinding wheel, the grinding fluid, the machine tool, and the workpiece. Each of these is associated with several parameters that can influence the grinding process: such as, the type and size of the diamond grit, the properties of the grinding fluid, method of delivery of the grinding fluid, and grinder characteristics (e.g., stiffness and vibration).

A specific experiment is proposed to characterize the effects of grinding parameters on the flexural strength of ceramic “A.” The investigators are particularly interested in the effects of grinding speed, wheel diamond grit size, and “down feed rate” on the ceramic strength.

1. What is the goal of the lab with respect to machining ceramics and state an objective for the specific experiment
2. Give an experimental plan. Which factors are varied and the number of levels. How you might determine the values for the levels for each factor? What are the advantages and disadvantages of this plan?
3. Three other variables not described anywhere in this problem description that may not be simple to control? For each variable, what might be done to avoid confounding the experiment due to these variables?
4. The need for replications that is specific to this type of experiment?

9. The CAA dealt with both stratospheric and tropospheric ozone issues. Explain which sections addresses which issue and how these two issues are addressed. (SHORT ESSAY)

7. Identify two factors that affect the lifetime of pollutants in the atmosphere, and explain how these two factors affect pollutant lifetime. (SHORT ESSAY)

5. Name the top five air pollutants we presently regulate. Is there a common source for these top five air pollutants? If so, what is it? What percentage of our atmospheric gases do these top five regulated gases make up? (SHORT ESSAY)

1.) A company is producing a product that has the following data:

volume of sales per year = 3

00,000 units

selling price per unit = $10

0

variable cost = $6

0 per unit

fixed costs per year = $6

00,000

book depreciation = $4

00,000

tax depreciation = $50

0,000

debt interest = $1

00,000

tax rate = 40%

With the above data determine

(a) Before

-

tax profit

(b) After

-

tax profit

(c) Break

-

even yea

rly volume of sales

(d) Break

-

even selling price

(e) Plot the break

-

even chart

Talk about Water Supply System and how it works in our houses within 2 pages long or more (typed). You may provide pictures.