Question
Physics Question on Power
From an automatic gun a man fires 360 bullets per minute with a speed of 360 km/hour. If each weighs 20 g, the power of the gun is :
A
600 W
B
300 W
C
150 W
D
75 W
Answer
600 W
Explanation
Solution
Here : Number of bullets n = 360, Time = 1 minute =60 sec, Mass of bullet = T2T1=x+mgx−mg(∵GivenT2T1=53) Velocity v = 360 km/hr 53=x+mgx−mg Now power of gun is given by 3x+3mg=5x−5mg x=4mg = 600 watt