The fine horizontal scratches etched onto a bullet after it has been fired are called Striations.
<h3>What is Striations?</h3>
- Striations are the minute differences in the curve of the bullet's surface. The bullet and the gun barrel are the harder and softer materials, respectively, in firearms evidence.
- The striations left on the fired bullet are used as a comparison by firearm examiners.
- When a gun is discharged, the bullet blasts down the barrel where it strikes ridges and grooves, spinning and improving shot accuracy.
- These ridges cause striations in the bullet's soft metal by digging into it.
- An examiner analyses these distinctive markings to verify whether a given bullet was shot from a specific firearm.
- A barrel will produce individual markings in addition to a bullet's land and groove impressions as the projectile passes through.
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Answer:
Explanation:
La aceleración es directamente proporcional a la magnitud de la fuerza resultante. Así, si se duplica la fuerza, la aceleración se duplica; si se triplica la fuerza, se triplica la aceleración. Por otro lado, la aceleración es inversamente proporcional a la masa del cuerpo que se acelera.
The momentum is equal for both. So
M(gun) * V(gun) = M(bullet) * V(bullet)
So
V(gun)=M(bullet) / M(gun) * V(bullet)
= .01 / 40 * 400 = 1/10 m/s = 0.1 m/s
A 1 m (39 inch) barrel length implies an acceleration of 80,000 m/s2
D=V^2 / (2*a) → a = V^2 / (2*D)
= 160,000 / 2 = 80,000 m/s2
V = a*t → t = V / a
= 400 / 80,000 = 1 / 200 second = 0.005 s
This means the gun is accelerated at
V = a * t → a = V / t
= 0.1 / 0.005 = 20 m/s2
And is displaced by
D = 1/2 * a * t^2 = 0.5 * 20 * 0.005^2
= 0.00025 m = 0.25 mm
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