Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN: 9781305086272
Author: William P. Spence, Eva Kultermann
Publisher: Cengage Learning
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Chapter 3, Problem 6RQ
To determine
Which material group has the lowest value of thermal conductivity
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1. Zinc is an important trace nutrient for photosynthetic organisms (e.g., phytoplankton) in sea water. Calculate the speciation of zinc (Zn(II)) in seawater assuming Zn(II) TOT = 5 x 10-8 M. Provide a list of the metal-ligand complexes and their corresponding stability Constants that you will include in your calculation. If you decide to exclude any of the complexes for which stability constants are provided in Table 9.4, please list these separately and explain your rationale. b. Compute the concentrations of the metal-ligand complexes identified in part a. c. Compute the activities of the metal-ligand complexes using the concentrations calculated in part b and using the data in Table 9.6B to calculate the activity coefficients. (Note—you likely already have a spreadsheet where you calculated activity coefficients from week 3!)
Q.2 The required design span for the beam given in Q.1 is increased to 18 ft. The design loads
are the same as given in Q.1 Check the adequacy of a 10"x16" 10 Caribbean Pitch Pine –
(Select Structural) for this these design conditions.
Chapter 3 Solutions
Construction Materials, Methods and Techniques (MindTap Course List)
Ch. 3 - What are the major material groups?Ch. 3 - Prob. 2RQCh. 3 - What are the mechanical properties that define a...Ch. 3 - How does a tensile stress differ from a...Ch. 3 - Prob. 5RQCh. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - What is the most common form of chemical...Ch. 3 - Prob. 9RQCh. 3 - Prob. 10RQ
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- The timber floor framing for a building comprise floor joists using 2" wide nominal lumber is to be constructed as shown in Fig. 1. The Dead load (D) = 26 lbs./ft² (inclusive of joists and flooring) and the live load L= 40 lbs./ft². Lateral torsional buckling is prevented for all members and normal service conditions and temperatures are expected. (i) Design the floor joists using 2" wide nominal lumber using Southern Pine No. 1 (ii) Design the floor beams using Caribbean Pitch Pine (Select Structural). (Assume a 8" x 14” trial section to estimate beam self-weight for your initial design). Density of Caribbean Pitch Pine = 50 lbs/ft³ (800 kN/m³).arrow_forwardP12.38 WP At a point on the free surface of a stressed body, a normal stress of 64 MPa (C) and an unknown positive shear stress exist on a horizontal plane. One principal stress at the point is 8 MPa (C). The absolute maximum shear stress at the point has a magnitude of 95 MPa. Determine the unknown stresses on the horizontal and vertical planes and the unknown principal stress at the point.arrow_forwardA pile group of 25 piles has to be proportioned in a uniform pattern in soft clay with equal spacing in all directions. Assuming the value of cu to be constant throughout the depth of the piles, determine the optimum value of spacing of piles in the group. Assume a = 0.7. Neglect point bearing effect, and assume the piles to be circular.arrow_forward
- Example 5 By using the yield line theory, determine the moment (m) for an isotropic reinforced concrete two-way slab (supports on two S.S sides shown in figure under the load (P) (all dimensions are in mm). Solve by using equilibrium method m m 3000 2000 2000arrow_forwardA +7.5% grade meets a horizontal grade on a section of a rural mountainous highway. If the length of the crest vertical curve formed in that section is 300 ft long, determine the safe operating speed on the highway.arrow_forwardA sawn timber beam of dimensions 8"x14" has is required for a span of 16 ft. The uniformly distributed loads are Dead (D) = 350 lbs./ft and live (L) = 400 lbs./ft. The dead load includes the beam self-weight and lateral torsional buckling is prevented. The beam is to be used in an indoor environment (MC > 19º) in normal temperatures. Using Caribbean Pitch Pine (Select Structural), check that the section chosen is adequate.arrow_forward
- 2. Find the moment of inertia and radius of gyration about the coordinate axes of a thin rectangular plate of constant density bounded by the lines x=3 and y = 3 in the first quadrant.arrow_forwardVehicle begin to arrive at a parking lot at 6:00 am at a rate of 8 per minute. No vehicles arrivefrom from 6:20 to 6:30 am. From 6:30 am on vehicle arrive at a rate of 2 veh/min. The parkinglot attendant processes incoming vehicles at a rate of 4 veh/min throughout day. AssumingD/D/1 queue, determine total vehicle delayarrow_forwardA cantilever beam 12 ft long supports a uniform service superimposed deadload of 1 kip/ft, and a concentrated service live load of 14 kip at the free end. Theconcrete compressive strength is 4 ksi, and the steel yield strength is 60 ksi. Thebeam section at the support is shown. Find the adequacy of the section inresisting bending moment at the support.arrow_forward
- u(t) (Uss) -1 a/w = 1.0 M 1 2 3 Tarrow_forwardplease helparrow_forwardPlease use MATLAB with codes and figures.Recreate the following four Figures of the textbook using MATLAB and the appropriate parameters. Comment on your observations for each Figure. List all of the parameters that you have used. The figures are attached belowarrow_forward
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