Based on jar test results, 51 mg/L of alum is used to coagulate a sample containing 114 mg/L suspended soids. How many mg/L as CaCO3 of natural alkalinity are consumed? What is the mass rate of sludge generated if suspended solids are reduced to 10 mg/L? Assume Al(OH)3 is precipitated (EW=26.0 mg/meq). The plant treats 100,000 gpd.

Mechanical and electrical systerms for construction managers.

1. What are the different components of a water heater and what are they for?
2. What are the advantages of an in – line water heater?
3. What are stack vents for?
4. Discuss two or more reasons for venting a plumbing system.

Describe a “windrow” and its purpose in mining.

Three types of steels used to manufacture reinforcement bars? rail, Axle and billet

i need a Definition for each term and Example

1- ecological footprint

2- ecological rucksack

3- biomimicry

How are the density-time measurements in a hydrometer translated into grain size percentage-passing data?

A Simply supported rectangular, tension-reinforced beam is to be designed for dead load of 0.75 k/ft plus self weight and service live load of 2.0 k/ft, with a 30 -ft simple span. Material strength will be fy = 60 ksi and fc = 5 ksi for steel and normal weight oncrete respectively.

Startthe design of the beam dimensions using the rules of thumbs in class. The total beam depth, h, must not exceed twice the width.

Calculate the required beam dimensions and tensile steel requirement (As required) to carry the Maximum moment found at mid span. Start with a steel ratio of half of "usable rho" in Table 27.2 in the text. Use ACI load factors and strength reduction factors. The effective depth (d) may be assumed at 3 inches less than the total depth (h).

Draw a sketch clearly showing spacing, cover, and bar locations.

What is the consequence of SCM on the heat of hydration?

Applications of higher order differential equations

A spring has one of its ends fixed, and a force of 15 N stretches it 20cm. A mass of 4 Kg is attached to the end of the spring, and the system is set in motion with initial position = 60 cm and initial velocity = 1.5 m/s.

(a) Find the spring constant. 
(b) Write a problem of initial conditions for spring stretching, in meters. 
(c) Solve the problem posed in (b). 
(d) Write the solution in the form x = rsen(ωt + θ). 
(e) What are the amplitude, frequency and period of movement?

The phase relations in the system of CaO-SiO2 show the possibility of C3S formation at temperature range from 1250 to 2150 °C. However, to produce pure C3S phase, generally, over 1600 °C is suggested, which is considerably higher than the 1450 °C in an industrial kiln. Explain why it is possible to form C3S at this lower temperature in the industrial kiln.

A two-lane minor road intersects a two-lane major road at 90 degrees, forming a four-leg intersection with traffic on the minor road controlled by a yield sign. A building is located 40 ft from the minor road. If the speed limit were 45 mi/h on the major road and 25 mi/h on the minor road, determine the minimum distance that the building can be located from the centerline of the outside lane of the major street.

Construction management homework

Plaintiff vs Defendant

( 1 page about all relevant facts about the case, What is court decision? Why? )