a ball is attached to an ideal spring and oscillates with a period of 4.44s. the ball has a mass of 1kg and the spring constant is 2N/m. if the mass of the ball is doubled what is the new period

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.