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A machine gun fires n bullets per second and the mass of each bullet is m. If v is the...

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nasirjam | Student, Grade 9 | (Level 2) Honors

Posted May 3, 2013 at 5:07 PM via web

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A machine gun fires n bullets per second and the mass of each bullet is m. If v is the speed of each bullet then the force exerted on the vehicle is

A) mng B)mnv

C) mnvg D)mnv/g

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted May 5, 2013 at 9:40 AM (Answer #1)

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First we have to determine the units of Force.

Force = mass * acceleration

Force = Newton = (kg-m)/(s^2)

 

Mass of each bullet = m

The number of bullets fired per seconds = n

The velocity of each bullet = v

 

We can say that the force applied on the vehicle can be expressed as = mnv

 

We can see that the units of force fits with the expression mnv. The answer is therefore letter B. mnv

 

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