3.) Air
4.) Stay same size but different internal pressure
5.) Stars
It looks like Doppler effect. Sound waves passing through a big way until they get to your ears. We got the highest frequency when we receive it, while it goes it remains the same and when it goes down we receive lower frequency.
I don't know what the question is but this is an example of static electricity
Answer:
friction can be used to slow things down but it can also be harmful because it can cause fire to start
