In January 2025
Answer to Question #260017 in Mechanics | Relativity for Jake
A rifle bullet can penetrate one plank. If the velocity of the bullet be tripled, how many planks it will penetrate ?
Consider this problem from the energy conversion viewpoint. Suppose that the amount of energy required to pass through one wooden plank is Ep and is independent from the initial velocity of the bullet. Then by increasing the initial velocity 3 times
we will increase the energy E∝v2=9E0 9 times. Therefore, if
E0=Ep, then E=9Ep and it will be able to get through 9 planks.
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