In 2010, the percentage of construction worker deaths resulting from the "Fatal Four" was _____.
a. 18
b. 33
c. 46
d. 57
Answer: D
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?In bulk polymerization, ____ guarantee a high ratio between surface area and volume.
A. ?narrow, tubular reactors B. ?catalysts C. ?small drops of monomer D. ?heat stabilizers
For the same thickness, which of the following materials has the highest R-value?
A) Polyisocyanurate B) Fiberglass C) Gypsum D) Extruded polystyrene E) Expanded polystyrene
In both steel classification systems, the first number often, but not always, refers to ____.
A. the most appropriate type of welding B. the basic type of steel C. the melting point D. the carbon content
PROBLEM 2.47 The assembly shown consists of an aluminum shell (Ea = 70 GPa, ?a = 23.6 ? 10–6/?C) fully bonded to a steel core (Es = 200 GPa, ?s = 11.7 ? 10–6/?C) and the assembly is unstressed at a temperature of 20?C. Considering only axial deformations, determine the stress in the aluminum when the temperature reaches 180?C.
