Suppose that a parallel-plate capacitor has circular plates with radius R and a plate separation d. Suppose also that a sinusoidal potential difference with a maximum value Vm and an angular frequency ω is applied across the plate; that is,

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.