Air is flowing in a 1.5 m² wind tunnel at 200 m/s at a pressure of 250kPa, and temperature of 20°C at the entrance. Calculate:

(i) Mach number

(ii) Total Temperature

(iii) Total Pressure

(iv) Mass flow rate of air.

1. Talking to on-campus recruiters, strong leadership skills is the most frequently mentioned attribute sought in college graduates. Discuss the importance of leadership to the effective management of construction projects. What differentiates management and leadership? What makes a good leader? Share an example of good or bad leadership that you have personally experienced. Lastly, where do you stand in your personal growth as a leader? What skills do you seek to improve before graduation?

“The room is too loud. My ears are ringing everyday” What type of room is this? Suggest solution / solutions for this problem.

why concrete is weaker than cement paste?explain the affects of water /cement ratio and supplemantary cementitious materials on transition zone

I need to write a literature review on nano-additives for concrete, with aspects on structure, properties and recycling. Can anyone offer any general thoughts in regards to the types of findings expected (in laymans terms)?

Multiple choice Mark one or more correct answers to the following questions:

a. Which of the following properties is the best indicator of the materials resistance to the plastic deformation

A. young’s modulus

B. yield strength

C. tensile strength

D. percent elongation

b. Martensite steel is brittle because of:

A. tempering

B. grain size strengthening

C. strain hardening

D. solid solution hardening

c. Electroneutrality may be maintained in the introduction of Na+ impurity in FeO by simultaneously introducing:

A. an interstitial oxygen for every two Na+

B. an interstitial Fe2+ for Na+

C. an oxygen vacancy for every two Na+

D. conversion of an Fe2+ to Fe3+ .

d. Strength of a glass piece can be enhanced by:

A. precipitation hardening

B. annealing

C. reducing the average grain size

D. tempering

E. cold working

e. An eutectic alloy is characterized by

A. lenticular particles in a solid phase

B. alternating layers of two phases

C. a substitutional solid solution

D. a concentration ingredient

Determine the area in acres of the lot enclosed by the following coordinates. You may use the Area by Coordinates method or the Area by Simple Figures Method.

A (N 575.00, E 112.50), B (N 127.50, E 347.00), C (N 381.50, E 750.00), D (N 673.50, E 651.00)

A 100 ft steel tape of cross-sectional area 0.0025 in2, weight 2.0 lb, and standardized at 68°F is 99.983 feet between end marks when supported throughout under a 10-lb pull.

a. What is the true horizontal length of a recorded distance AB if AB was measured to be 140.23 ft? At the time of measurement, the average temperature was 55°F, the tape was unsupported and there was 17 lbs of tension on the tape. (Assume horizontal taping and all full tape lengths except the last.)

a. To measure the BOD₅ of a wastewater, three dilutions are prepared. The data for the tests are provided below. What is the BOD of the wastewater?

b. The BOD₅ of a wastewater is estimated to be 75 mg/L at standard temperature. The k value is 0.150 day^-1 at standard temperature. What is the ultimate BOD?

The following are balanced interior angles to the right for a five-sided traverse. Given the Azimuth of course AB is 250°00’00”, compute and tabulate the azimuths for each side of the traverse.

Sound attenuation is an important in fabricating walls between rooms in luxury hotels. Three wall cavity fillers have been identified for use. The desired reduction in sound is based on the decibel level heard on the opposite side of a wall from the side where the sound intensity is at 88 decibels using the A weighting method. The sound heard in an adjoining room should be no more than 57 decibels. The science of sound is that sound is a wave with the magnitude of the sound measured as pressure (P). The formula for the decibel scale is 20*log(P/P_ref) where P_ref = 20 µPa. One µPa is equal to 10^-6 Pa.

a. What is the P of 88 decibels in pascals?    

b. What is the P of 57 decibels in pascals?     

For this problem, sound attenuation rating of material is measured by the fraction of sound pressure that penetrates through a layer of material thickness. A material rated as 0.75 per inch means the sound intensity pressure after passing through an inch of material is 75 percent of the starting value. Sound attenuation based on this measure is geometric so if there was 2 inches of material the resultant sound pressure intensity would be the rating squared or 0.75² of the starting pressure. When sizing the thickness to meet a specified sound reduction the practice is to round up to the next quarter of inch (0.25 inch) unit. If the calculated needed thickness was 1.64 inches the rounded up dimension would be 1.75 inches and all calculations and design sizing would use that dimension. Use the data on the materials located below to answer the questions.

c. What is the design thickness of Material A is required to meet the specification?   

d. What is the design thickness of Material B?

e. What is the design thickness of Material C?   

f. What is the cost per square foot of wall based on the thickness calculated above using the material that is the most expensive to install in a wall to meet the specification?   

g. What is the cost per square foot of wall based on the thickness calculated above using the material that is the least expensive to install in a wall to meet the specification?

Define the horizontal collimation?

Useful Skills in Today's Office Discussion: In today's offices, employers are looking for key skills. Do a little research and tell us at least five (5) key skills each employee should have to be marketable

A 20 m thick saturated clay layer is normally consolidated. At mid-depth in this layer, the void ratio (e) is 1.110, the coefficient of compressibility (av) is 5.74 x10³ cm2=N. Recall that w = 9.81 kN/m3. a) Assuming that a 122 cm lowering of the ground water table (GWT) occurs in the soil overlying the clay layer, what settlement will occur in the soil overlying the clay layer because of the ultimate primary consolidation of the clay layer? Express your answer in units of centimeters. It may be assumed that the lowering of the ground water table does not change the moisture content (and thus unit weight) in the soil above the groundwater table. NOTE: the thickness of the overlying soil layer, as well as it material properties (e.g., the unit weight) are not needed to solve this problem. b) What is the volumetric strain associated with the ultimate primary consolidation of the clay layer? Express your answer in percent (%).