Q2. A machine gun can fire 20 bullet per second, if the speed of the bullet is 100 m/s and if each bullet is of weight 100 gm, then calculate force required to hold the gun in its position.

Asked by sbidipak | 5th Jul, 2017, 07:10: PM

Expert Answer:

-While a man fires with a gun, an impulsive force acts on him.
-Impulsive force is the force of impact which two or more bodies exert on one another acts only for a short time, giving a brief but strong push.
-Impulsive Force (I)= m x v = 0.1 kg x 100 = 10 N-s
-The number of bullets fired per second is the ratio of the force required to hold the gun in its position to the impulsive force.
begin mathsize 12px style Number space of space bullets space fired equals fraction numerator force space required space to space hold space the space gun space in space its space position over denominator impulsive space force end fraction
Force space required space to space hold space the space gun space in space its space position left parenthesis straight F right parenthesis equals impulsive space force cross times number space of space bullets space fired
straight F equals space 10 cross times 20 equals 200 straight N
end style 

Answered by Abhijeet Mishra | 6th Jul, 2017, 12:17: PM