When the distance between two masses is doubled, the gravitational attraction between
them will be

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

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.