A beam has dimensions of b = 18 in., h = 30 in., and d = 27.5 in. and is reinforced with 3 No. 7 bars. The concrete strength is 4,600 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth to the neutral surface is c = 1.871374 in., determine the strain in the reinforcement.

Jorgito: ¡Ay, Macarena! ¡Creo que hay [q14] debajo de mi cama! Macarena: Tranquilo, Jorgito. ¿Ves? No hay [q15] allí. ¡Tienes una gran imaginación! Jorgito: Macarena, no quiero ir a dormir porque [q16] estoy cansado [q17] me leíste el libro que me gusta. Macarena: Es verdad, Jorgito. ¿Prefieres leer un libro de aventuras [q18] de animales?

(04.04 MC)Zebra mussels were first discovered in North America in the Great Lakes in 1988. This invasive species eats phytoplankton and other microscopic organisms in fresh water. What would be the most likely effect if zebra mussels are introduced into a local fresh water lake?

(05.02 MC)A population of hummingbirds is composed of individuals with short or long beaks, which they use to reach nectar inside flowers. A flowering trumpet vine that produces many deep, bell-shaped flowers is introduced to the region, resulting in fewer short-beaked and more long-beaked hummingbirds. Which of the following conditions most likely caused this shift in the hummingbird population?

(06.04 MC)Which of the following provides the best comparison between reptiles and fish?

A beam has dimensions of b = 16 in., h = 26 in., and d = 23.5 in. and is reinforced with 4 No. 7 bars. The concrete strength is 4,000 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the nominal moment capacity, Mn, of the beam.

(04.05 MC)Which of the following best describes the long-term impact of using a renewable energy source?

In populations of children with no known risk for tuberculosis, you would recommend:

(04.03 HC)Domestic cats can begin reproducing as young as six months of age. Each female cat can produce two litters per year, containing multiple cats that can also begin reproducing early. What prediction can you make about an ecosystem in which cat populations are not controlled?

(04.01 MC)The table shows the commonly eaten foods of some organisms. Commonly Eaten Foods List Group Commonly Eaten Foods A squids, crabs, lobsters B branches, barks, twigs, roots C insects, leaves, nuts, bird eggs D vegetables, fish, grains, fruits Which groups contain both primary and secondary consumers?