Question

A machine gun fires $180$ bullets $perminute$ with a velocity of $300m{s}^{-1}$. If the mass of each bullet is $10gm$, the power of the machine gun will be:

• A. $1.35kW$
• B. $0.675kW$
• C. $5.4kW$
• D. $2.7kW$

Answer 1

The correct option is A $1.35kW$

$P=\frac{mn{v}^2}{2t}$
$=\frac{{10}^{-2}\times 180\times (300{)}^2}{2\times 60}$
$=1.35kW$