Light travels from water (n=1.33) into an unknown medium. If the angles of incidence and refraction are 40 degrees and 25 degrees respectively. What is the index of refraction of the unknown medium?

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.

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Identify the type of chemical reaction that is described.