The driver of an automobile, which travels with a velocity of 110 km/h on an a 8% graded
descending section of an asphalt paved straigth highway on a rainy day, recognizes a
pedestrian crossing the street 100 meters away and applies the brake.
a) Determine whether the accident occurs or not.
b)If the driver is crashing with the pedestrian, what would be the maximum velocity to
avoid the accident ?
Given: Pavement sliding friction coefficient, f= 0,30; detection-response time, tr= 1 sec.

How is the PDS product design specifications developed your product?.

A concrete mix is required for reinforced concrete wave breaker at seashore where frequent mild freezing and thawing is dominant.
A specified compressive strength of 25 MPa is required at the age of 28 days, and the size of the section and reinforcement dictate using a maximum aggregate size of 19 mm.
The company had no history of testing concrete used.
The coarse aggregate meets the ASTM grading requirements. It has absorption of 2%, a BSG (D) of 2.70 and a unit weight of 1550 kg/m3. The fine aggregates have absorption of 1%, a BSG (D) of 2.7 and a fineness modulus of 2.7.
Both coarse and fine aggregates are used while dry. For each bag of cement (50 kg); calculate the number of containers of coarse and fine aggregate equivalent to required mass quantities.
The volume of each container is 20 liters; and the loose density of the coarse and fine aggregates are 1250 and 1200 kg/m3, respectively.

Case Scenario Analysis:

Managing risks in construction projects has been recognized as a very important management process in order to achieve the project objectives in terms of time, cost, quality, safety and environmental sustainability. A study aims to identify and analyze the risks associated with the development of construction projects from project stakeholder and life cycle perspectives. The study identified following risk factors.

1.Tight project schedule

2.High performance/quality expectations

3.Low management competency of subcontractors

4.Incomplete or inaccurate cost estimate

5.Lack of coordination between project team members

6.Unavailability of sufficient professionals and managers

7.Serious air pollution and noise caused by construction activities

Develop understanding on how and on what level three factors of your choice can generate risk in achieving project objectives. Finally, identify a set of measures that you as a project manager would like to plan and implement to reduce risk and ensure achievement of project objectives and contribute in business development.

Hint: Your answer should include the way the factor develop risk in the achievement of project objectives and its level. Finally, you need to develop measures or actions you would like to implement to manage and/or minimize the risk.

1. Wastewater from Taman Cenderawasih is treated through a bio tower. These are the data related to the bio tower:

Compute:

1. Ratio of recycled flow to the influent flow
2. Hydraulic loading (m³/m².min)
3. Volume of the medium needed

6.11 Perpetrators of Air Pollutants and CO2 (15 pts)What and how are top three perpetrators of our environment on air pollutants and greenhouse gases? Use a typical coal-fired power plant as example to delineate and environmental impacts in US and the world.

DOT wants to install a traffic signal at a dangerous intersection on US-51. The traffic signal will cost $450,000. Based on historical data, it will eliminate, on average, one fatal accident every 10 years, but will cause 5 additional minor accidents every year. The standard cost assigned to fatal accidents is $12,300,000 and the cost assigned to minor accidents is $160,000 each. At an interest rate of 4% per year, does the B/C ratio justify the cost of the signal? Assume a useful life of 30 years for the traffic signal.

a. Design a concrete mix for construction of a water tank using ACI Committee 211.1-year 1991. The specified design strength of concrete is 30 MPa at 28 days. Standard deviation can be taken as 4 MPa. The specific gravity of fine aggregate and coarse aggregate are 2.65 and 2.7 respectively. The dry rodded bulk density of the coarse aggregate is 1600 kg/m3 and the fineness modulus of fine aggregate is 2.80. Ordinary Portland cement (Type I) will be used. A slump of
50 mm is necessary. Coarse aggregate is found to be absorptive to the extent of 1% and free surface moisture in the sand is found to be 2 percent. Assume any other essential data.
b. If slump value increase to 100 mm, design concrete mixing using the same data.
Compare and discuss the result.

What is an “Alimak lift”?

The pressure drop per unit length of a pipe, dl/dp , for steady, incompressible viscous flow through a straight horizontal pipe depends on the average velocity, V, density of fluid, p, fluid viscosity, µ, pipe diameter, D, and the roughness height, ks. Determine the dimensionless groups that can be used to correlate the data.

Annual emissions of CO₂, CH₄ and N₂O in the USA are estimated to be 6,000 MtCO₂/yr, 36 MtCH₄/yr and 1.75 MtN₂O/yr.

1. What are the impacts of these gases emitted from the USA over a 100-year time horizon?
2. Find the total equivalent CO₂ emissions.

For bending only, determine the lightest-weight W-shape
to carry a uniform dead load of 4.5 kip/ft plus the
beam self-weight and a live load of 3.5 kip/ft on a simple
span of 24 ft. Consider only the limit state of yielding and
use A992 steel. Design by (a) LRFD

At the end of a sporting event, vehicles begin leaving a parking lot at λ(t) = 12 − 0.25t and vehicles are processed at μ(t) = 2.5 + 0.5t [t is in minutes and λ(t) and μ(t) are in vehicles per minute]. Assuming D/D/1 queuing, determine the total vehicle delay, longest queue, and the wait time of the 50th vehicle to arrive assuming first-in-first-out and D/D/1 queuing.

Answer:  total delay=1016.15 veh-min, Delay 50th veh=5.64 min, Max Q=60.167 veh