To practice problem-solving strategy 16.2 doppler effect. the sound source of a ship’s sonar system operates at a frequency of 22.0 khz . the speed of sound in water (assumed to be at a uniform 20∘c) is 1482 m/s . what is the difference in frequency between the directly radiated waves and the waves reflected from a whale traveling straight toward the ship at 4.95 m/s ? assume that the ship is at rest in the water. mastering physics g

147 Hz

Explanation:

First we need to know what frequency will the waves hitting the whale have respect of it.

The change in frequency is calculated with this equation:

However in this case, the wave is bouncing on the whale and coming back, so there is a double frequency shift (the difference is the same both times because the relative speeds between the two objects is the same both times)

Then:

The frequency shift is positive, it will have increased frequency.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

there are no contact forces mentioned on the list of choices that you've provided.