*The Did you Know thread*

If a bullet is fired horizontally on flat ground from a gun at 1000m/s, and at the exact same moment, another bullet falls vertically from right next to the gun muzzle; both will hit the ground at the same time*.

*ignoring air resistance...
 
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charliegolf said:
If a bullet is fired horizontally on flat ground from a gun at 1000m/s, and at the exact same moment, another bullet falls vertically from right next to the gun muzzle; both will hit the ground at the same time*.

*ignoring air resistance...
Click to expand...

Did you know, that if you stand on the back of a train doing 100mph, and you fire a bullet,in the opposite direction of the train, at 100mph.

The bullet will drop out of the muzzle, and drop straight to the ground.
 
trazor said:
Did you know, that if you stand on the back of a train doing 100mph, and you fire a bullet,in the opposite direction of the train, at 100mph.

The bullet will drop out of the muzzle, and drop straight to the ground.
Click to expand...
That's because it wouldn't be much of a gun.
The train would have to be travelling at more like more than 1000 mph for your theory to work in practise.
 
That the worlds longest running amphibious vehicle (car) maker is a UK company

Dutton

in Little Hampton

dunno if there amphibious car could go across the channel ? From say Calais to Dover ?? It would have to be a calm sea ?
 
trazor said:
Did you know, that if you stand on the back of a train doing 100mph, and you fire a bullet,in the opposite direction of the train, at 100mph.

The bullet will drop out of the muzzle, and drop straight to the ground.
Click to expand...

Not true - the fastest bullet can travel at around 1,800mph, the slowest around 800mph.
 
transam said:
That the worlds longest running amphibious vehicle (car) maker is a UK company

Dutton

in Little Hampton

dunno if there amphibious car could go across the channel ? From say Calais to Dover ?? It would have to be a calm sea ?
Click to expand...
Jeremy Clarkson's amphibious vehicle did the channel crossing.
I'm sure it could be done in reverse without much difficulty.
 
trazor said:
Did you know, that if you stand on the back of a train doing 100mph, and you fire a bullet,in the opposite direction of the train, at 100mph.

The bullet will drop out of the muzzle, and drop straight to the ground.
Click to expand...

No way. If you were on a train and threw a tennis ball to someone at say 20 MPH, the ball will travel at 20 MPH (initially) to the person, it doesn't magically hit you in the face at 80 MPH.
 
If you have a piece of string that is just long enough to go around the equator, in order to elevate said string uniformly 1ft above the equator, you only need 6.28 feet of extra string to make the ends meet again.

The same is true if you did the same with a pea, or the sun (ignoring the fact it would be burnt to a crisp)
 
Bobby Dazzler said:
That's because it wouldn't be much of a gun.
The train would have to be travelling at more like more than 1000 mph for your theory to work in practise.
Click to expand...

It was merely an hypothesis to determine an example of relativity, not to be taken literally,perhaps beyond your comprehension.
 
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