You are driving on the highway at 40 m/s with another car driving to you at exactly the same speed. when you honk your horn (with a frequency of 315 Hz), what frequency of the sound will the driver of other car perceive. A. 475 hz
B. 235 Hz
C. 315 Hz
D. 7.8 Hz
please give me the answer 30 points+brainliest

An observer that stands still as the electron moves by him, will observe

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Aswimmer is determined to cross a river that flows due south with a strong current. initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. in which direction shoud the swimmer head? a. the swimmer should swim southeast. b. the swimmer should swim south. c. the swimmer shuold swim northeast. d. the swimmer should swim due north. e. the swimmer should swim due east.