Ignoring reflection at the air-water boundary, if the amplitude of a 10 ghz incident wave in air is 20 v/m at the water surface, at what depth will it be down to 1 µv/m? water is characterized by er = 81, µr = 1, and σ = 0.1 s/m. can water described above, at 10 ghz, be described as a low-loss dielectric, good conductor, or "in-between"?

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.