A man pulls his luggage on a 30 degree incline with a constant force of 25 N. How much work does he do after walking 20.0 m?
a) 430 J
b) 330J
c) 1500J
d) 250 J

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.