The muzzle energy from a .45 caliber round can vary between 350 to a little over 500 ft-lbs, with velocites from about 850 feet per second to over 1000 FPS. The .40 caliber round can range from about 480 to about 570 ft-lbs of energy with velocities ranging from about 1000 FPS to about 1400 FPS. So, in short, it depends on the specifications of the particular cartridges you are comparing.
it is a little less powerful but not by much
No, not by a longshot (no pun intended). Almost all "major" caliber handguns are more powerful than the 9mm.
.380 is slightly larger in diamater than the .32, and in general, more powerful.
"Powerful" is somewhat of a subective term, but the answer is yes. 5.56 is a rifle cartridge and 9mm, assuming you mean 9mm parabellum, is a handgun cartridge. Under normal circumstances, bullets fired from rifles will have more velocity and more muzzle energy than bullets fired from handguns.
9X19mm is the most common handgun caliber in the world. It's easy to use and cheap. Handguns in the caliber usually have high capacities. The most often portrayed "nine" is a Glock 17 or 19, because of their generic appearance. The slightly more powerful.40 caliber (10X21mm) is slowly taking it's place and has been mentioned in rap music.
100-500 or more depending on specifics
Impossible to say without a more detailed description of the handgun in question.
no, a 45 caliber is way more powerful than a 40 caliber Actually, it depends. The following is copied from another answer of mine: The muzzle energy from a .45 caliber round can vary between 350 to a little over 500 ft-lbs, with velocites from about 850 feet per second to over 1000 FPS. The .40 caliber round can range from about 480 to about 570 ft-lbs of energy with velocities ranging from about 1000 FPS to about 1400 FPS. So, in short, it depends on the specifications of the particular cartridges you are comparing.
Depends on the application. If you mean power, the higher the caliber, the more powerful it is. for example, a .22 caliber rifle is much less powerful than a .50 caliber rifle.
Really depends on the load, but the .270 is typically the more powerful of the two.
It depends on the load
yes