An observer watches water waves passing a stationary boat causing it to move up and down. The time for one complete cycle of this motion is 10s and the distance from top to bottom is 2m. If the wavelength of the waves is 5m their velocity is

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

i believe the answer would be:

d. violin, clarinet, french horn, and tuba