The Doppler effect is the right concept to solve this problem. The Doppler effect is understood as the change in apparent frequency of a wave produced by the relative movement of the source with respect to its observer. Mathematically it can be described as,

Here,
= Frequency of the sound from the Whistle
f = Frequency of sound heard
v = Speed of the sound in the Air
Replacing we have that





Therefore the minimum speed to know if the whistle is working is 16.33m/s
<span>the one that should be taken as consideration when describing the quality of a sound is: D.The number of the overtones in the sound
Too many overtones indicated that there is too many unrelated sound that make a lot of the sound's part became redundant and unecessary</span>
Answer:
1). Brake pedal or lever
2). A pushrod also called an actuating rod
22.3 rad/s
<h3>
Further explanation</h3>
We will solve the question of uniform circular motion.
<u>Given:</u>
- A bicycle has tires of radius
- The bicycle is traveling at a constant speed of

<u>Question:</u>
What angular speed are the tires rotating?
<u>The Process:</u>
Speed, angular speed, and radius are connected in the following formula:

The angular speed is worked out by

All units are in the SI system so let us calculate the angular speed.

Thus the value of the angular velocity of the rotating tire is 
<u>An additional question:</u>
What is the frequency of tire rotation?
Recall this formula: 

We get 
<h3>Learn more</h3>
- Arc CD is ²/₃ of the circumference of a circle. What is the radian measure of the central angle? brainly.com/question/2115496
- A triangle is rotated 90° about the origin brainly.com/question/2992432
- Particle's speed and direction of motion brainly.com/question/2814900
Keywords: a bicycle has tires of radius 0.35 meters. traveling, at a constant speed of 7.8 m/s, at approximately, angular speed, the tires rotating