1. Form hypothesis: Suppose you already know how many ants it takes to lift an object straight up (using the 10-cm stick). How can you predict the number of ants that will be needed to lift
the object with an inclined plane of a certain length?
Hint: Play with the Gizmo. See how doubling the length changes the number needed.

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.