It could mean several things. The first thing to check is the wear on your brake pads and/or discs.
they can hear sound in ears
Sound perspective is the way you hear a sound. (Where you hear it coming from)
The loudest sound that we can hear is about 130 decibels.
What unusual sound do they hear in the fire?
It is just a guess when I am not able to hear the particular sound. If it is somewhat of a metalic tubing sound it could just be the exhaust tubing cooling down.
"Hear" doesn't have an "a" sound at all; it has a long "e" sound.
ticking sound from a wheel is usually a dry or worm wheel or axle bearing
You should have an auto mechanic check the car or take to the Ford dealership.
When a sound wave is reflected, you hear an echo.
you can hear by sound wave and ears
Sound is longitudinal waves that you can hear. http://en.wikipedia.org/wiki/Longitudinal_wave
Check whether your speakers are connected to your default soundcard.