What are the advantages and the disadvantages of the differing site conditions method?
What will be an ideal response?
This system is intended to generate lower bid prices because the contractor
need not attempt the often difficult task of providing a contingency in its
pricing for the subsurface uncertainties and need not incur extensive costs
connected with its own testing if it is not certain that the information
furnished y the owner under the disclaimer system is accurate. The most
important disadvantage is the uncertainty of the ultimate contract price.
Also the cost of administering the DSC system can be formidable. Another
argument sometimes made against the DSC system is the uncertainty as to
whether it actually induces lower bids.
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The process of matting wool fibers together into a solid mass under high pressure is called:
a. Felting c. Crimping b. Scaling d. Scouring
Using a waste factor of 12 percent, determine the amount of concrete needed to pour the slab shown in Figure 11.44. The slab is 4 inches thick.
What will be an ideal response?
According to Newton’s law of cooling, the time t needed for an object at an initial temperature 
to cool to a temperature T in an environment with ambient temperature 
is given by 
here k is a constant. Assume that for a certain type of container, k = 0.025 min–1. Let t be the number of minutes needed to cool the container to a temperature of 50°F. Assume that 
= 70.1 ± 0.2°F and 
= 35.7 ±
0.1°F. Estimate t, and find the uncertainty in the estimate.
According to Newton’s law of cooling, the time t needed for an object at an initial temperature to cool to a temperature T in an environment with ambient temperature
is given by
here k is a constant. Assume that for a certain type of container, k = 0.025 min–1. Let t be the number of minutes needed to cool the container to a temperature of 50°F. Assume that = 70.1 ± 0.2°F and = 35.7 ± 0.1°F. Estimate t, and find the uncertainty in the estimate.
A vapor barrier material that is applied over wall studs and ceiling joists after insulation is installed is _____
a. aluminum foil b. house wrap c. rigid foam board d. polyethylene film