The diagram below shows four coastline locations on earth with respect to the moon and sun at a given time. earth is shown as a circle with a smaller circle labeled moon to the right of it and a larger semicircle labeled sun to the right of that. points w and y are marked at the top and bottom ends of the circle representing earth. points x and z are marked at the left and right sides of the circle representing earth. in this current position, which coastline(s) are experiencing the high spring tides? both w and y both x and z only w only x

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants