Heater core leak, or stopped up condenser drain line.
It's the sound of food and waste moving through your intestine making its way to your bowels. It can also be stomach acid breaking down food.
Little sound waves travel toward you ear and toward your eardrum when a sound is made. Inside your ear are 3 little bones that vibrate when sound passes. Then the sound reaches the cochlea and the little hairs inside start moving. I'm quite sure that's how sound is made, give or take a few facts... Look it up on a medical website if still in doubt.
Maybe there's a beehive inside of it.
To be more specific, a sound source moving toward you will appear to emit a sound of higher frequency than actual. Conversely, a sound source moving away from you will appear to emit a sound of lower frequency than actual. See "the Doppler effect."
False. The speed of sound in air is constant, around 343 meters per second. When the source of sound is moving, it can affect the frequency and intensity of the sound, but not the speed at which the sound travels.
it's either a human moving the object or it is just vibrating itself.
It's moderately loud, making clicking sounds when moving the loading mechanism, and sort of a "chuck" sound when shot.
Music is likely to sound louder outdoors due to reduced sound absorption and the lack of confined spaces for the sound waves to bounce around. This can result in a greater spread of sound, potentially making it seem louder.
The sound echo's around inside the drum
After moving, a cat typically makes a "meow" sound.
Sound waves can diffract around corners because they exhibit wave-like behavior and can bend when they encounter an obstacle. This bending allows sound waves to travel around obstacles and reach the other side, making it possible for us to hear sound around corners.
One experiment is to use a bell inside a vacuum chamber. When the chamber is evacuated of air, the sound of the bell will not be heard because there is no medium (air) for the sound waves to travel through. This demonstrates that sound requires a medium to propagate.