Answer to Question #16943 in Mechanics | Relativity for aruj

Question #16943
a bullet moving with a speed of v can just penetrate two planks of equal thickness. find the no. of such planks that the bullet will penetrate if its speed is doubled
1
Expert's answer
2012-10-26T10:48:09-0400
The energy of the bullet will increase

N =& (m(2V)²/2) / (mV²/2) = (2V)² / V² = 4

times if its speed is doubled. So, the bullet will penetrate 4 times more planks, that is

M = 2*4 = 8

such planks.

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Comments

Assignment Expert
29.10.12, 17:56

It's ratio of kinetic energy of the bullet with velocity 2V to kinetic energy of the bullet with velocity V

Abhishek
27.10.12, 18:46

What is 'N' in = 'N = (m(2V)²/2) / (mV²/2)'?

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