ENGINEERING YOUR FUTURE
9th Edition
ISBN: 9780190279288
Author: Oakes
Publisher: OXF
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Chapter 1, Problem 1.7A
i.
To determine
Explain the evolution of the first accounts of civil engineering in history and its changes over period. Also illustrate new area and reason for becoming part of civil engineering.
ii.
To determine
A significant American civil engineering project and tell its importance in the history of united states.
iii.
To determine
In simple term, construction of any: a bridge, a canal, or a sewer.
iv.
To determine
The connection between mining engineering and civil engineering.
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Question 7
A well is pumped from a confined aquifer at a constant rate of 1000 gallons per minute (gpm). The following data were collected during the pumping
test:
.
Distance from the well to the observation well (r) = 150 feet
Differential drawdown (Ah) in the observation well at this distance = 2.5 feet
Aquifer properties:
Transmissivity (T) = 25,000 gpd/ft
• Storativity (S)- 0.0005 (dimensionless)
Pumping time (t) = 5 hours
Watch your units !!
Using the above information, calculate the drawdown (h) in feet in the observation well at a distance of 150 feet after 5 hours of pumping. (Use the
powerpoint slides for approximations for the well function W(u).
Qu 2 Calcium oxide (CaO) a white, caustic, alkaline solid that reacts vigorously with water to produce calcium hydroxide, releasing heat in the process. It is used in various industrial applications, including cement production and water treatment.
FA=
41{0
The ionic radii of the ions are: TCa2+= 0.100 nm and roz-= 0.140 nm.
On the basis of this information answer the following questions:
1. What is the type of bonding that exists in CaO crystal?
2.Calculate attractive (Fs) force in [N] between a Ca'* iron and O* ifon that is separated by an equilibrium distance ro.
Calculate repulsive (FR) force in [N] between a Ca?* iron and O? iron that is separated by an equilibrium distance ro.
What is the magnitude of the net force FN?
Show work if any equations or calculations are used.What is the main alloying element and carbon percentage of SAE-AISI 4621 Steel?
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- The particle has a mass of 0.5 kg and is confined to move along the smooth horizontal slot due to the rotation of the arm OA. Determine the force of the rod on the particle and the normal force of the Isot on the particle when 0 = 30°. The rod is rotating with a angular velocity of ė = 2rad/s and an angular acceleration of = 3rad/s². Assume the particle only contacts one side of the slot at any instant. To check your answer, please enter the normal force of the slot onto the particle in Newtons. A * = 2 rad/s -0- 0.5 marrow_forwardSolve, use engineering economic tablesarrow_forwardSolve, use engineering economic tablesarrow_forward
- Qu 2 Calcium oxide (CaO) a white, caustic, alkaline solid that reacts vigorously with water to produce calcium hydroxide, releasing heat in the process. It is used in various industrial applications, including cement production and water treatment. The ionic radii of the ions are: TCa2+= 0.100 nm and roz-= 0.140 nm. On the basis of this information answer the following questions:Number 1 through 4 I need to show all work step by step problemsarrow_forwardShow work if any equations or calculations are used. Assuming hole basis, find the shaft and hole dimensions for a sliding fit using a basic hole size of 20mm. Show the max and minimum size for both hole and shaft. Utilize the equations and tables in the appendix.arrow_forwardShow work if any equations or calculations are used. A milling machine is equipped with a 1” diameter end mill. During a facingoperation, the spindle is running at 275 RPM. The depth of cut is 0.04” and linear feed rate is 2” per minute. Find: (a) Cutting speed, (b) Material Removal Ratearrow_forward
- L1 = 5.7m, L2 = 1m, L3 = 1.2m, L4 = 1m, L5 = 0.2, L6 = 0.5m, v2 = 4.8m/s. The solutions should include, but not be limited to, the equations used tosolve the problems, the charts used to solve the problems, detailed working,choice of variables, the control volume considered, justification anddiscussion of results etc.If determining the friction factor, the use of both Moody chart and empiricalequations should be used to verify the validity of the valuearrow_forwardPlease identify the marked points of the stress-strain curve (Write on graph next to corresponding letter) Stress, σ A D (slope of line) B. C Strain, &arrow_forwardr Q2. A bracket is attached to a vertical column by means of six identical bolts as shown in Fig. 1. It is subjected to an eccentric force of P-80 kN at a distance of 200 mm from the center of column. What is the magnitude of maximum shear force and which bolt carry it? P= 80 kN 200 Fig. 1 1 2- 75 6 30 75 → 5 .5 1- 50 10-50-1arrow_forward
- 3. The attachment shown in the Fig.2 is made of 1040 HR. The static force is 30 kN. Specify the weldment (give the pattern, electrode number, type of weld, length of weld, and leg size). 30 kN Fig. 2 500 All dimension in mm 100 (15 marks)arrow_forwardฉันต้องการหา อุณหภูมิสุดท้ายของกระบวนการนี้และงานของกระบวนการนี้มีค่าเท่าใดarrow_forwardThe pressure and temperature at the beginning of compression of a cold air-standard Diesel cycle are 100 kPa and 300 K , respectively. At the end of the heat addition, the divssure is 7.2 MPa and the temperature is 2050 K . Assume constant specific heats evaluated at 300 K . Determine:(a) the compression ratio.(b) the cutoff ratio.(c) the percent thermal efficiency of the cycle.(d) the mean effective pressure, in kPa .arrow_forward
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