Give the name of three essential parts of a loudspeaker

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

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.

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2