Homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. While, heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
Example of heterogeneous :
Oil and water
Smog
Example of homogeneous:
Salt water
Air
It's A they repel eachother
Explanation:
first, find the circumference of the wheel by using the formula 2(pi)(r):
2(pi)(19) = 119.380521
divide by 25 secs
119.380521/25 = 4.77522083
round to the nearest tenth is 4.8, so the speed is 4.8mm/sec
Answer:

Explanation:
Given:
- original frequency of sound wave,

- speed of the sound source,

- original speed of sound wave from the source,

<u>According to the Doppler's effect:</u>

The sound is reflected from the wall and the source is moving towards the wall and observer is also riding the same source.
The velocity of the observer,

