Helen can write 15 postcards in one hour, while Kate can write 20 postcards. How much longer would Helen take to write 300
postcards than Kate?
hours

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

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.

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?