Jane waits on a railroad platform while two trains approach from the same direction at equal speeds of 7.10 m/s. both trains are blowing their whistles (which have the same frequency), and one train is some distance behind the other. after the first train passes jane but before the second train passes her, she hears beats of frequency 6.50 hz. what is the frequency of the train whistles

156.96691 Hz

Explanation:

f' = Actual frequency

v = Velocity of sound in air = 343 m/s

= Relative velocity of train = 7.1 m/s

= Beat frequency = 6.5 Hz

Receding frequency

Approaching frequency

Beat frequency is given by

Actual frequency of the train whistle is 156.96691 Hz

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

attach the statements so i can answer : )