A disk begins rotating from rest with an angular acceleration of α in rad/s. Which of the following equations is correct for the time in seconds it takes for the disk to complete one full rotation? A. t = α/2
B. t = πα
C. t = √(2/α)
D. t = √(2π/α)
E. t = √(4π/α)

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.