How many times is the velocity of a bullet passing through 1/4 of the rifle barrel less than when
| July 4, 2021 | education
How many times is the velocity of a bullet passing through 1/4 of the rifle barrel less than when it leaves the barrel? Consider bullet acceleration constant.
To find the ratio of the velocities of the indicated bullet after passing through 1/4 of the rifle barrel and when flying out of the barrel, we use the equality: Vk ^ 2 / Sk = 2a = Vn ^ 2 / Sn, whence we express: Vk = √ (Sk * Vn ^ 2 / Sн) = Vн * √ (Sk / Sн).
The ratio of the variables: Sk (full path of the bullet) = 4Sn (initial path).
Let’s make a calculation: Vc = Vn * √ (Sk / Sn) = Vn * √4Sn / Sn) = 2Vn.
Answer: After passing through 1/4 of the rifle barrel, the indicated bullet will have 2 times less velocity than when it leaves the barrel.
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