1.

The machine gun fires 240 bullets//min. If the mass of each bullet is 10 g and the velocity of the bullet is 600 ms^(-1), the power (in kW) of the gun is

Answer»

43200
432
72
7.2

Solution :POWER=workdone`//`Time taken
Work done= Total kinetic energy of the bullets
`n=1/2mv^(2)`
n = 240, m = 10 g, v = 600 `ms^(-1)`(Given)
`= 240x1/2 X10 x10^(-3)x(600)^(2)`power = `(120 xx 10 xx360)/(1MIN) =( 120xx10xx360)/(60)` 7.2 KW


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