two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. they emit sound with a frequency of 514 hz. a person is standing away from the wall, in front of one of the loudspeakers. what is the closest nonzero distance from the wall the person can stand and hear constructive interference? the speed of sound in air is 343 m/s.

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

What will a positive and a negative charge do if they are separated from each other?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.