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# An Interesting Little Thing About Gravity

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posted on May, 14 2010 @ 09:40 AM

Originally posted by Death_Kron

I've read that if the bullet was travelling at a certain speed it would actually never hit the ground and orbit the earth as others have alluded to above.

That one's easy
gravity = 9.81m/sec^2 on the earth's surface
earth's radius = 6.378 x 10^6 metres
using A=V^2/R
V=sqrt(A.R) = 7910 metres/sec

Naturally you'd need to fire from the top of a high mountain to ensure it didn't encounter any obstacles and there's a little matter of atmospheric drag to deal with as well. Getting outside the atmosphere makes things a bit easier

posted on May, 15 2010 @ 10:18 PM

Can you remember what else you studied in 7th grade.
I can remember we studied that part in 4-5 grade.
In 7 th we studied Electrical resistance, Electromagnetism , electromotive force of induction and Basic properties of semiconductors.
We studied form an outdated communist program and you had to learn a LOT of stuff...

And yes Pilgrum you are correct but your result will vary a little.

[edit on 15/5/10 by defiler]

posted on May, 17 2010 @ 06:51 AM

Pilgrim,

You just gave me flashbacks to A Level Physics classes!

posted on May, 17 2010 @ 07:33 AM
This is really a vector problem...
(Assuming a gun with a barrel of 0 length, and no wind or other resistance.)

If the gun is fired horizontally, there is an external force applied by the gun in a horizontal direction. However, there is no external force applied by the gun in a downward direction. The only downward force is that of gravity.

Therefore, the bullet will move much further horizontally, since an external force is applied horizontally, but they will both move downwards at exactly the same speed, since they have only the same external force (gravity) acting on them in the downwards direction.

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