Two ways the Doppler effect can be applied to every day life is...
1. The pitch of an Ambulance Siren shifts as it passes you.
<span>2. A cop's radar gun using radiation waves to find out how fast your going as you confused I-85 with the speed limit</span>
Example:
<span>Suppose that a ball has an initial velocity v0 that has magnitude 20.0 m/s and is directed 60.0 degrees above the negative x axis.
Then, the x-component is,
20.0 * cos(-60) = 20.0 * (1/2) = 10.0</span> m/s
There is attraction between the two poles. This is because like poles repel and unlike poles attract.
Hope it helped!