7. A boat heads directly southward across a river at 12 m/s as shown below. If the current in the river is flowing at 5 m/s due east, what is the magnitude of the boat's
resultant velocity?

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

electromagnetic waves travel through space with vacuums. give me brainliest if right.

answerscientific theory;