Astationary police car emits a sound of frequency 1200 hz that bounces off a car on the highway and returns with a frequency of 1250 hz. the police car is right next to the highway, so the moving car is traveling directly toward or away from it. (a) how fast was the moving car going? was it moving toward or away from the police car? (b) what frequency would the police car have received if it had been traveling toward the other car at 20.0 m/s?

(a): The moving car was going at Vo= 14.29 m/s moving toward the police car.

(b) If the police car had been traveling toward the other car at 20 m/s would receive a frequency of f''= 1327.39 Hz.

Explanation:

V= 343 m/s

f= 1200 Hz

f'= 1250 Hz

Vo= ?

Vf= 0

f'= f* {(V - (Vo) / V}

clearing Vo:

Vo= 14.29 m/s  (a)

f''= f* {(V - (Vo) / V - 20 m/s}

f''= 1327.39 m/s (b)

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

hey , the answer is c