Oliver, while visiting a nearby army base, gets to visit the firing range. When he fires the first round his mind turns to physics and he wonders. If the bullet leaves the muzzle of the rifle with a velocity of 600 m/s, and the barrel of the rifle is 0.9 m long, at what average rate is the bullet accelerated while in the barrel? (20 pts)​

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.