When a car is at rest, its horn emits a frequency of 600 Hz. A person standing in the middle of the street hears the horn with a frequency of 580 Hz. Should the person jump out of the way?

car is moving away from, so we does not need  to move from his position.

Explanation:

given data

initial frequency = 600 Hz

final frequency =  580 Hz

solution

As we know that by the Doppler effect causes we received frequency of any sources

and

when frequency increases that mean you are moving toward the source or that source is moving towards you

and

when frequency decreases it mean you are moving away from source or the source is moving away from you

and here we have given frequency is decreases from 600 Hz to 580 Hz

so car is moving away from, so we does not need  to move from his position.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.