A person observes a firework display from a safe distance of 0.750 kilometer. Assumign that sound travels at 340 m/s in air, what is the time between the person seeing and hearing fireworks explosion.

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward