Homework Help: physics

Posted by sunny on Thursday, April 5, 2012 at 8:59am.

a machine gun fires 10 bullets persecond into a target. each bullet weights 20 gm and had a speed of 1500 m per second .find the force neccessary to hold the gun in posotion?

physics - drwls, Thursday, April 5, 2012 at 9:45am
Average force = (momentum change)/time
= (bullet mass) x velocity x (10/ second)
physics - Damon, Thursday, April 5, 2012 at 9:45am
10/s * .02 kg = .2 kg/s
force = rate of change of momentum or m a
= change in momentum per second
= .2 kg/s * 1500 m/s
= 300 kg m/s^2 = 300 Newtons

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