You are pushing a 20-kg box along a horizontal floor. friction acts on the box. when you apply a horizontal force of magnitude 48 n, the box moves at a constant velocity. if you increase your horizontal pushing force to 100 n, what is the acceleration of the box?

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.