Laws Of Motion Question 255
N bullets each of mass m kg are fired with a velocity $ v,m,{{s}^{-1}} $ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by
Options:
nmv
B) $ \frac{Nmv}{n} $
C) $ n\frac{Nm}{v} $
D) $ n\frac{N}{v m} $
Show Answer
Answer:
Correct Answer: A
Solution:
Total mass of bullets = Nm, time $ t=\frac{m}{n} $
Momentum of the bullets striking the wall = Nmv Rate of change of momentum (Force) = $ \frac{Nmv}{t} $ = $ \frac{Nmv}{t} $.
BETA
