One of the four primary reasons for using compression reinforcement in beams is decreased cost.

(04.02 LC)Which of the following events is most likely to result in conditions suitable for primary succession?

The most common perpetrators of child maltreatment are:

(05.02 MC)A scientist has kept records of the color variations in a field of phlox for several generations. Phlox is an annual plant that produces flowers in a variety of shades ranging from white to red. Initially the field contained equal proportions of white, pink, and red flowers. By the end of the study the proportions of flowers in the field were 80% red, 15% pink, and 5% white. Which of the following inferences best explains the change in flower color proportions?

At what age would you be most worried if a child is not walking?

A beam has dimensions of b = 14 in., h = 24 in., and d = 21.5 in. and is reinforced with 5 No. 7 bars. The concrete strength is 5,500 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the nominal moment capacity, Mn, of the beam.

A beam has dimensions of b = 16 in., h = 28 in., and d = 25.5 in. and is reinforced with 5 No. 8 bars. The concrete strength is 4,900 psi, and the yield strength of the reinforcement is 60,000 psi. Assuming the reinforcement has yielded, determine the tensile force T in the reinforcement.

A beam has dimensions of b = 16 in., h = 24 in., and d = 21.5 in. and is reinforced with 5 No. 5 bars. The concrete strength is 6,100 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the compressive stress block is a = 1.121022 in. and the strain in the reinforcement is εs = 0.039865, determine the strength φMn for this beam. Assume the transverse reinforcement is not spirals.

(05.03 MC)Using your knowledge of hominid evolution, which of the following correctly associates the given brain capacities with the hominid species in the table in order from smallest to largest? Species Time period(millions of years ago) Tool use A. afarensis 3.6–2.8 Possible tool use A. africanus 3.0–2.4 Possible tool use H. habilis 2–1.5 Simple stone tools H. neanderthalensis 0.13–0.035 Complex stone tools

A beam has dimensions of b = 14 in., h = 24 in., and d = 21.5 in. and is reinforced with 4 No. 6 bars. The concrete strength is 5,500 psi, and the yield strength of the reinforcement is 60,000 psi. Assuming the reinforcement has yielded, determine the tensile force T in the reinforcement.