re: Gun shot in the air - How long does it take for the bullet to fall back to ground?

need to know escape velocity and angle also technically wind speed / direction, but the first two would be good enough to get a decent estimate.

Also horizontal distance traveled from firing to ground level impact could be utilized as opposed to angle of travel if necessary.

For a generally accurate estimate, all you need to know is the angle upon firing and escape velocity. More info will be needed for more technical answers or if one of the above is not known.

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I wondered about this question when I went quail hunting. We're shooting (and missing) at quail flying through the air. Those bullets had to go somewhere.

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Um, hopefully you weren't shooting bullets into the air to hunt birds, but rather used a shotgun. Bird shot will not travel over about 200 or 300 yards. Even high-brass pheasant loads shouldn't travel much more. As long as people aren't shooting low birds, there isn't much to worry about. I've had shot rain down on me several times while dove hunting. Eye protection isn't a bad idea.

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incorrect. A water molecule (~18 g/mol) is lighter than the rest of the gasses in the air (i.e. oxygen ~32 g/mol, nitrogen gas 28 g/mol), therefore decreasing the average density of the air.

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Went with an intuitive assessment rather than double checking specific gravity. Thanks for the correction.

minus surface gravity!

missing velocity and vector assuming no other variable like wind, humidity and temperature are having effect.

handguns do not have extraordinary range however, a few seconds would be a reasonable assumption.

Bushmaster 5.56?

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That is all things related to air density, not any kind of "level of gravity" Gravity is a set rate of acceleration as a component of force exerted on one object by another.

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nope. gravity can and does fluctuate. LSU students proved it in 2015.

Depends on if it was a liberal or a white man.

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9.8 m/s is acceleration due to gravity

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1. That should be "meters over seconds squared", the way you wrote it is "meters per second"

2. The level of gravity has to be known, if your using Colorado or Sweden gravity then it's not gonna be the same as Louisiana gravity. 9.8 is a good estimation but not close enough for this problem.

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1. That should be "meters over seconds squared", the way you wrote it is "meters per second"

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That's fair, but I only left it as it is because m/s^2 looks faggy.

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2. The level of gravity has to be known, if your using Colorado or Sweden gravity then it's not gonna be the same as Louisiana gravity. 9.8 is a good estimation but not close enough for this problem

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fricking Louisiana uses all the gravity...