In a building, air moves due to currents caused by temperature differences. Which statement best describes these currents? A.)They transfer electrical energy due to convection.

B.)They transfer thermal energy due to radiation.

C.)They transfer thermal energy due to convection.

D.)They transfer electrical energy due to conduction.

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.