Which of the following groups in the molecule shown below is most likely to participate in an electrostatic interaction involving dipoles?        

A 115-mm-long beam supports a load of P = 33 N at midspan. The cross section is rectangular with width b = 28 mm and height h = 45 mm. Determine the magnitude of the horizontal shear stress at the centroid of the cross section.

A continuous beam’s flexural reinforcement must extend at least _____ from the point where it is no longer needed to resist tension. Assume f’c = 4,000 psi, fyt = 40,000 psi, b1 = 32 in., b2 = 16 in., d1 = 4 in., d2 = 15 in., and that there are three No. 6 longitudinal tension bars and No. 3 stirrups at 10 in. o.c. The stirrup hooks are 90°.

A simply-supported beam has a 3 kip/ft uniformly-distributed load over the entire 10-ft span. What is the magnitude of the maximum shear force in the beam?

If φVc = 14 kip and Vu = 27 kip, are stirrups required?

Compute φVn for the cross section shown. Assume f’c = 8,000 psi, fyt = 40,000 psi, b = 13 in., d = 20 in., and that there are four No. 9 longitudinal tension bars and No. 5 stirrups at 9 in. o.c.

Compute φVn for the cross section shown. Assume f’c = 4,500 psi, fyt = 40,000 psi, d = 30 in., w = 24.5 in., t = 4 in., and that there are four No. 7 longitudinal tension bars and No. 4 stirrups at 11 in. o.c.

Which of the following statements is true about the ion channel controlled by the nicotinic receptor?

Determine the casting-position modification factor, ψt, for a rectangular beam with b = 16 in. and d = 23 in., three uncoated No. 8 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 3 Grade 40 stirrups located every 6 in. along the span. Assume 5,000-psi normal-weight concrete and a clear cover of 2 in.

Compute φVn for the cross section shown. Assume f’c = 6,000 psi, fyt = 60,000 psi, b1 = 28 in., b2 = 13 in., d1 = 4 in., d2 = 18 in., and that there are three No. 7 longitudinal tension bars and No. 4 stirrups at 7 in. o.c.