An observer stands 3 m from speaker a and 4 m from speaker b. both speakers, oscillating in phase, produce 170 hz waves. the speed of sound in air is 340 m/s. what is the phase difference (in radians) between the waves from a and b at the observer’s location, point p?

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?