No. Some rounds are naturally subsonic (such as the .45 ACP), some tend to be borderline (such as the .22 LR), and some available in reduced loadings to make them subsonic.
No, bullets are accelerated by rapidly expanding gasses. Those gasses are in a cylinder only open at one end. The bullet acts as a piston, and is pushed out of the open end of the cylinder. Not all bullets are supersonic, but those that are become supersonic from the amount of acceleration, and the time it is applied.
Yes, but it is travelling supersonic so you don't hear it until it has passed you or just reached you Not all bullets are supersonic.
Some .40 caliber bullets are supersonic and some are not; it depends on the load. Generally lighter bullets (155 grain or less) will be supersonic, and heavier bullets (165 grain or more) will be subsonic, although there are a couple 165 grain bullets out there with advertised velocities about equal to the speed of sound. No matter what bullet you purchase, if you feel like subsonic/supersonic is a difference-maker to you, then check the manufacturer's specifications on the ammunition you're purchasing.
No, most bullets however do break the sound barrier, at roughly 1100 fps is the speed of sound. Some of the smaller pistal rounds like the 9mm go about 900 fps to about 1050 fps. So there you have it not all bullets break the sound barrier.
Yes, at all times that it is traveling supersonic.
Bullets fired from supersonic firearms, such as rifles and handguns, can travel faster than the speed of sound. Some common examples include .223 Remington, .308 Winchester, and 9mm Luger ammunition. Bullets fired from these firearms create a sonic boom when breaking the sound barrier.
Less velocity means less energy if the mass remains the same During the Vietnam war, the Navy Seals experimented with using sub-sonic bullets for covert operations (less bullet noise with no supersonic whine). In some cases, the bullets failed to pierce bare skin.
yes all bullets can exeplode if not look after
no
The cast of All Out of Bullets - 2012 includes: Dolph Lundgren as himself
no
Supersonic