Physics!: bullets spinning on a frozen lake

Thursday, October 28, 2010

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4 comentarii:

Anonymous said...

Will somebody figure this out: The muzzle velocity of that round is 1200 feet per second, that barrel spins the bullet once for every 9.84 inches the bullet travels. How many RPM is that bullet spinning at when it leaves the barrel?

Anonymous said...

I got 87,805 RPM, or 1,463 rotations per second.

Anonymous said...

If barrel is 9.84 inch long it spins 1RPM per second

Anonymous said...

Here is the formula for determining bullet RPM:

MV x (12/twist rate in inches) x 60 = Bullet RPM

Quick Version: MV X 720/Twist Rate = RPM

MV = muzzle velocity

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