This usually means that a belt is going out on the car and needs to be replaced. Usually the time belt makes this noise. Also this could be your fan and that sometimes needs to be replaced. This could be inaccurate, but that is the most logical. No matter what it is best to get these small problems fixed right away because it will just be more expensive when your car breaks further because of this.
It goes faster
A car goes faster when you accelerate. It slows down when you brake.
Water makes sound slower and if it goes through matter it goes faster
You would hear the sound after the plane has passed.
A worn alternator belt, loose alternator belt or bad alternator belt tensioner.
Sound moves through a solid faster than anything. In order it goes, solid, liquid, and gas. So metal is faster than water is faster than air.
Light travels much, much faster than sound. Light travels at 299792458 m/s while sound only goes 340.29 m/s.
Because light is faster than sound. We see by light and hear by sound. Light goes approximately 299,792,458 meters per second while sound only goes 340.29 meters per second. Thus the light bouncing off the strike is much faster than the sound that comes from it and so we see faster than we hear.
For you kids, thinking Sonic is faster, well, you're outdone. Mario is faster than Sonic. Bullet Bills go FASTER than sound, but are slowed down in the games so you can actually know what's going on, and if Sonic goes at the speed of sound, Mario must be faster than sound because he can stomp Bullets faster than Sound, and thus Sonic is slower.
Water can absorb sound waves, reducing their intensity and making them less audible. Sound also travels faster in water than in air because water is a denser medium. Additionally, the presence of water can distort sound waves, causing them to scatter and become less clear or distinct.
It could just be the heat shield on the under side of the catalytic converter.
When an airplane goes faster than the speed of sound, it reaches the speed of sound barrier, called Mach 1. This can create a sonic boom, which is a loud noise caused by shock waves produced by the plane breaking the sound barrier. The aircraft is said to be supersonic when flying faster than the speed of sound.