Which equation shows the conservation of mass? 1 point (1) Na + Cl₂ → NaCl (2) Al + Br₂ → AlBr₃ (3) H₂O → H₂ + O₂ (4) PCl₅ → PCl₃ + Cl₂

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.