Two cars are involved in a crash (no one was hurt in the accident). If the total momentum is 4120 kg. m/s after the collision, what is the
total momentum before the collision?

A. 0 kg • m/s
B. 8240 kg • m/s
C. 2060 kg • m/s
D. 4120 kg • m/s

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.