Fundamentals Of Construction Estimating
4th Edition
ISBN: 9781337399395
Author: Pratt, David J.
Publisher: Cengage,
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Chapter 4, Problem 8RQ
To determine
To describe: the requirement using grid method for cut and fill volume calculation.
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The following data is representative of that reported in an article on nitrogen emissions, with x = burner area liberation rate (MBtu/hr-ft²) and y = NOx emission rate (ppm):
x 100 125 125 150 150 200 200 250 250 300 300 350 400 400
140 150 180 210 180 310 270 400 420 430 400 600 600 660
(a) Assuming that the simple linear regression model is valid, obtain the least squares estimate of the true regression line. (Round all numerical values to four decimal places.)
y =
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Yes, the data is perfectly linear, thus lending to accurate predictions.
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5.25 Water from a pipe is diverted into a weigh tank for exactly 1 min. The increased weight in the tank is 80 kN. What is the discharge in cubic meters per second? Assume T = 20°C.
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- Determine the heel and toe stresses and the factor of safeties for sliding and overturning for the gravity dam section shown in the figure below for the following loading conditions: - Horizontal earthquake (Kh) = 0.1 - Normal uplift pressure with gallery drain working Silt deposit up to 30 m height - No wave pressure and no ice pressure Unit weight of concrete = 2.4 Ton/m³ and unit weight of silty water = 1.4 Ton/m³ - Submerged weight of silt = 0.9 Ton/m³ == - Coefficient of friction = 0.65 and angle of repose = 25° Solve this question with the presence of gallery and without gallery., discuss the issue in both cases.... Solve in table 144 m 4m Wi 8m 6m 8m 1.7m 120marrow_forwardThe efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft²). An article gave the accompanying data on tank temperature (x) and efficiency ratio (y). Temp. 171 173 174 175 175 176 177 178 Ratio 0.82 1.39 1.48 0.95 1.15 1.06 1.00 1.82 Temp. 181 181 181 181 181 182 182 183 Ratio 1.35 1.52 1.55 2.19 2.17 0.92 1.45 0.82 Temp. 183 183 183 185 185 186 187 189 Ratio 1.85 2.04 2.70 1.59 2.54 3.04 1.89 3.12 (a) Determine the equation of the estimated regression line. (Round all numerical values to four decimal places.) y = (b) Calculate a point estimate for true average efficiency ratio when tank temperature is 183. (Round your answer to four decimal places.) (c) Calculate the values of the residuals from the least squares line for the four observations for which temperature is 183. (Round your answers to two decimal places.) (183, 0.82) (183, 1.85) (183, 2.04) (183, 2.70) Why do they not all have the same…arrow_forwardProblem: In designing an asphalt concrete mixture for highway pavement, data in the table below showing the aggregate characteristics were used. Percent by weight of Effective specific Aggregate type Bulk specific gravities total paving mixture gravity Coarse aggregates 42 Fine aggregates 51 Mineral fillers 7 2.60 2.71 2.82 2.69 Determine the optimum asphalt content as a percentage of the total mix if results obtained using the Marshall method are shown in the following table. The specific gravity of the asphalt is 1.02. (Use Table 8 for required specifications.) Weight of Specimen (g) Percent Asphalt in Air in Water Stability (lb) Flow (0.01 in.) 5.5 1325.3 785.6 1796 13 6.0 1330.1 793.3 1836 14 6.5 1336.2 800.8 1861 16 7.0 1342.0 804.5 1818 20 7.5 1347.5 805.1 1701 25arrow_forward
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