The average temperatures (°F) for an 8-day period are: 32,35,34,36,48,43,42, and 40. If the area has an initial SWE of 2.46 in, K=0.06in/deg-day, and a runoff coefficient of CR = 0.5, plot the estimated daily runoff (in) from the watershed and determine the total melt and runoff for the 8-day period.
In: Civil Engineering
In: Civil Engineering
Construct a BOD demand curve for a sample that has a first order reaction constant K of 0.16 day–1 (base 10) and a nitrogenous reaction constant KN 0.08 day–1 (base 10). Nitrification is not significant until a period of 7.5 days has passed. The ultimate first stage BOD is 335 mg/L and the ultimate nitrogenous demand is 120 mg/L. 1) What is the total BOD exerted at 10 days? 2) How many complete days are required to exert at least 90% of the expected demand?
In: Civil Engineering
A simply supported beam 10m long carries a uniform load of 24 kN/m. Using E = 200 GPa, I = 240x10^6 mm4
Using CBM (conjugate beam method):
A. Determine the rotation (in degrees) of the beam at a point 4m from the left support.
B. Determine the deflection at a point 4m from the left support.
In: Civil Engineering
Q. Describe briefly how the coefficient of consolidation (Cv) value can also be estimated based on a full scale loading trial. Explain why it is more reliable to use the Cv value obtained from a field trial than from a lab test ?
In: Civil Engineering
In: Civil Engineering
Describe a safety hazard you've encountered in the workplace? How was the hazard corrected? Did anyone get injured? Were you involved in correcting the hazard? What was the final outcome? If it was not corrected, what do you think should have been done?
In: Civil Engineering
Calculate the first three frequencies of axial vibration of a bar fixed at one end.
In: Civil Engineering
I. Solve the homogeneous differential equations with the constant coefficient.
a. ? ′′ + 5? ′ + 6? = 0
b. 4? ′′ − 8? ′ + 3? = 0 ? (0) = 2, ? ′ (0) = ½
II. Solve non-homogeneous differential equations with the indeterminate coefficient method.
a. ?′′ − 3? ′ = 5cos(?)
b. ? ′ ′ + 5? ′ + 2? ′ = 7? 3?
III. Solve non-homogeneous differential equations with the parameter variation method.
a. ? ′′ − 2? ′ + 3? = ? 2? ? 2
b. ? ′′ − ? = 3??(?)
IV. Solve non-homogeneous differential equations by the operator’s method.
a. 3? ′′ + 3? ′ + ? = √?? −?
b. 6? ′′ − 2? ′ + ? = ? 2
In: Civil Engineering
Scraper tare (empty) |
72000 kg |
|
Average load carried |
31 m3 |
|
Density of material, in bank |
1650 kg/ m3 |
|
Load factor I |
0.7 |
|
Distribution of load to driving wheels (% of gross weight) |
57 % |
|
Uphill grade on haul road, loaded |
4 % |
|
Traction coefficient, haul road |
0.53 |
|
Rolling Resistance Factor, loaded |
0.38 kN/t |
|
Average speed, haul |
15 km/hr |
|
Haul distance |
1020 m |
|
Average speed, return empty |
44 km/hr |
|
Return distance (by different route) |
1130 m |
|
Efficiency factor (operator and scraper together) |
42 min/hr |
|
Fixed time is made up of: |
Spot time |
0.8 min |
Load time |
2.9 min |
|
Dump time |
1.4 min |
a) Calculate the gross vehicle weight (GVW) (kg)
(Answer in kg)
b) Calculate maximum tractive force (kN) on road at driving wheels when loaded
(Answer in kN)
c) Calculate the effective grade % on the haul road.
d) Calculate total resistance (kg) while hauling.
e) Calculate the total cycle time (minutes).
f) Calculate production rate, in Bank m3/hr.
In: Civil Engineering
In: Civil Engineering
1. Solve for the area between x^3 − 6x^2 + 8x − y = 0 and the x − axis.
2. Solve for the area bounded by y^2 + x − 4 = 0 and the y − axis.
3. Solve for the area of the arch of the cycloid x = θ − sinθ, y = 1 − cosθ.
4. Solve for the area bounded by x^2 − 2x − y = 0 and x^2 − 6x + y = 0.
In: Civil Engineering
A developer is going to build a new commercial building in Kowloon Tong. The features of the building are described as follows:
Note: UFA denotes Usable Floor Area
i ) Calculate the total cooling load for a given building.
This part fulfills the requirement of P5
In: Civil Engineering
researchers were interested in the effects of cannibis and ecstacy on abstract thinking.Participants were given a task that required them to solve problems/tasks using abstract thinking.Researchers also included a group of nonusers. Base on the scenario, identify the Idependent variable and the dependent variable. Is the IV a quasi or experimental?. what is the research question.
In: Civil Engineering