Which statement best describes why computer models are useful in science?
they can store and process data to make accurate weather predictions.
they are used to create more complex representations of large systems.
they cannot be revised after they are developed, tested, and shared with others.
they can be used to accurately make predictions without scientific evidence.

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.