Reinforced concrete beams are rarely continuous over several supports.

Cuando mi hermano y yo [q21] niños, a mí me [q22] ir de vacaciones al Caribe. Mi hermano y mi madre [q23] en el océano y mi padre [q24] pasear en barco.

You have a used CD store. At an estate sale, you can purchase 230 compact discs for $356.5. You believe you could sell the CDs for an average of $3.05 each. What is the net benefit of buying the CDs at the estate sale and selling them in your store?

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.

A beam has dimensions of b = 14 in., h = 22 in., and d = 19.5 in. and is reinforced with 4 No. 8 bars. The concrete strength is 10,000 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the nominal moment capacity, Mn, of the beam.

A simply supported beam with dimensions of b = 12 in., h = 24 in., d = 21.5 in., and L = 21 ft supports a uniform service (unfactored) dead load consisting of its own weight plus 1.3 kips/ft and a uniform service (unfactored) live load of 1.1 kips/ft. The concrete is normal-weight concrete. Determine the moment due to the factored loads, Mu.      

Consider the following prices from a McDonald’s Restaurant:Big Mac Sandwich$2.68Large Coke$1.45Large Fries$1.13A McDonald’s Big Mac value meal consists of a Big Mac sandwich, large Coke, and a large fries. Assume that there is a competitive market for McDonald’s food items and that McDonald’s sells the Big Mac value meal for $4.59. Does an arbitrage opportunity exists and if so how would you exploit it and how much would you make on one value meal?

Mi país es muy activo luchando contra el cambio climático. [rc]

A beam has dimensions of b = 18 in., h = 28 in., and d = 25.5 in. and is reinforced with 2 No. 5 bars. The concrete strength is 5,500 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the compressive stress block is a = 0.442068 in. and the strain in the reinforcement is εs = 0.131114, determine the strength φMn for this beam. Assume the transverse reinforcement is not spirals.

At 25°C, the equilibrium constant Kc = 0.0012 for the reaction  B(aq) + C(aq)  ↔  2A(aq)     A solution of 0.80 M of B and 0.80 M of C is mixed and allowed to come to equilibrium. A student does the following steps below to calculate the equilibrium concentration of A.  There is one error in this calculation. Identify the step where the student made an error.  (keeping extra digits until the end of the calculation is not an error).