Question #54720
1 Answer
Solution : The speed of each bullet is
Explanation : We are given the power of the machine gun and the firing rate (in bullets per minute). From this calculate the kinetic energy of each bullet.
Once the kinetic energy of each bullet is know we can calculate their velocity if their mass is given.
Some Useful Definitions
Power : Power is the rate at which energy is transferred (transmitted/received). It is the energy transferred per unit time.
Since the SI unit for measuring energy is Joules , the SI unit for power is Joules/second which is defined as Watts .
Another quantity related to energy transfer rate is called Intensity. This problem does not require knowing this but it does not hurt if we know that.
Intensity : Intensity is a measure of how concentrated the power is. Intensity is defined as the Power transferred per unit area.
Since the SI unit for measuring power is Watt , the SI unit for intensity is Watts/second.