The main difference between turbojets and rocket engines is the fact that a. turbojets carry their own supply of oxygen as oxidizers. b. turbojets are not dependent on oxygen from the air. c. rocket engines need oxygen from the air. d. rocket engines are not dependent on oxygen from the air.

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.