Aresearch vessel is mapping the bottom of the ocean using sonar. it emits a short sound pulse called "ping" downward. the frequency of the sound is 5600 hz. in water sound propagates at a speed of 1474 m/s. the sound pulse is then reflected back from the bottom of the ocean and it is detected by the vessel 8.88 s after it was emitted. how deep is the ocean just below the vessel?

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.