Question

When a machine gun fires n bullets per second, each with kinetic energy k then the power of machine gun is ______.

Options

• nk

• `n/k`

• n²k

• `k/n`

Answer 1

When a machine gun fires n bullets per second, each with kinetic energy k then the power of machine gun is nk.

Explanation:

Power is the energy transferred per unit time.

If the machine gun fires nn bullets every second and each bullet has kinetic energy k, then energy delivered in 1 second is:

E = nk

∴ P = `E/t`

= `(nk)/1`

= nk