Question

from an automatic gun a man fires 240 bullet per minute with a speed of 360 km/h. if each weight 20 g then power is
A. 400 W
B.150W
C. 300W
D.600W
​

Answer 1

KE=1/2∗m∗v2  

m = 20g

v = 360 km/h

KE = 100 J

So one round has 100 J of energy. If the gun fired for one minute, it’d expend 2,400 J of energy from it’s projectiles.

A 9mm handgun could be fired at around the same rate with reloading. Using a 8g bullet at 1180 km/h results in a KE of 430 J, and in one minute that equates to 103,200 J of energy from it’s projectiles.

So the gun in question is incredibly weak. Most likely an airsoft gun.KE=1/2∗m∗v2  

m = 20g

v = 360 km/h

KE = 100 J

So one round has 100 J of energy. If the gun fired for one minute, it’d expend 2,400 J of energy from it’s projectiles.

A 9mm handgun could be fired at around the same rate with reloading. Using a 8g bullet at 1180 km/h results in a KE of 430 J, and in one minute that equates to 103,200 J of energy from it’s projectiles.

So the gun in question is incredibly weak. Most likely an airsoft gun.

Answer 2

Answer:600W

Explanation:

no of bullets (n)=360, time =60sec, mass=2×10^-2, v=100m/s

Power=1/2mv^2/t×n

=1/2×2×10^-2×360×100×100÷60

=600W