Given specific value of parameter r =6.9 a, calculate the actual numerical ratio E(r)/E(2r) of magnitudes of the electric fields at point P for two different distances, r and 2r, in each of the configurations. This numerical ratio would then be approximately represented by 2n for scaling E(r) ∝ 1/rn, and that's how you determine

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.