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porkok
Nov6-03, 05:27 PM
If we shoot bullet to the air (90Degree) it will fall down to same spot or not ? (Without anther force)
Thanks

NateTG
Nov6-03, 05:45 PM
Well, where are you shooting from?

I assume that the bullet is not going more than 6km/s?

porkok
Nov6-03, 05:54 PM
From the ground (yes not over 6km/s). Could you give me answer and explanation ?
Thanks

NateTG
Nov6-03, 06:08 PM
6km/s is Earth escape velocity. I think you'll find that the problem specifies that the bullet is being shot from the surface of the Earth.

If you shot the bullet straight up out of a moving car, would it come down and hit you? What if the car was turning? What if the someone stomped on the brakes?

porkok
Nov6-03, 06:13 PM
Yes the bullet shot from the surface of the earth and pistol is not moving. So it should fall down in the same spot ,right ?

porkok
Nov6-03, 06:16 PM
We did not talk about another factor. (No other facetor in this situation)

NateTG
Nov6-03, 06:40 PM
Is the earth stationary?

porkok
Nov6-03, 07:06 PM
earth is still moving around itself

NateTG
Nov6-03, 07:49 PM
So, would the bullet move with the earth after you shot it?

HallsofIvy
Nov6-03, 09:09 PM
Yes. Conservation of momentum.

porkok
Nov7-03, 12:15 AM
Could you explain about conservation of momentum ? Thanks

NateTG
Nov7-03, 12:19 AM
Originally posted by HallsofIvy
Yes. Conservation of momentum.

Actually, since the earth is spinning, the reference frame is accelerated, so the bullet would not be moving with the earth.