There are many forms of design documentation, but the most common form is a ____.
A. finished detailed drawing
B. CAM model
C. concept map
D. selective laser model
Answer: A
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The reinforced concrete girder shown in Figure P7.44a is prestressed by a steel cable that induces a compression force of 450 kips with an eccentricity of 7 in. The external effect of the prestressing is to apply an axial force of 450 kips and equal end moment M P = 262.5 kip · ft at the ends of the girder (Figure P7.44b). The axial force causes the beam to shorten but produces no bending deflections. The end moments M P bend the beam upward (Figure P7.44c) so that the entire weight of the beam is supported at the ends, and the member acts as a simply supported beam. As the beam bends upward, the weight of the beam acts as a uniform load to produce downward deflection. Determine the initial camber of the beam at midspan immediately after the cable is tensioned. Note: Over time the
initial deflection will increase due to creep by a factor of approximately 100 to 200 percent. The deflection at midspan due to the two end moments equals ML 2 ?(8EI). Given: I = 46,656 in.4, A = 432 in. 2 , beam weight w G = 0.45 kip/ft, and E = 5000 kips/in. 2 .
Portland and similar cements react with water (hydrate) to create a gel that hardens by absorbing ____.
A. nitrogen dioxide B. carbon dioxide C. carbon monoxide D. hydrogen monoxide
As a general rule, the lower the value of the speed-power product, the better the device because of its:
A) short propagation delay and low power consumption. B) long propagation delay and high power consumption.
The dimensions of a rectangular duct with a butt seam are 8 1/2 inches wide by 10 1/4 inches high by 22 3/4 inches long. It has an overlap 1/4 inch. Find the width of the stretchout in inches.
Fill in the blank(s) with the appropriate word(s).