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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
Expert's answer
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.
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
It's ratio of kinetic energy of the bullet with velocity 2V to kinetic energy of the bullet with velocity V
What is 'N' in = 'N = (m(2V)²/2) / (mV²/2)'?
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