Physics

When an 8-lb rifle is fired, the 0.02-lb bullet receives an acceleration of 10^5 ft/s^2 while it is the barrel? (a) How much force acts on the bullet? (b) Does any force act on the rifle? If so, how much and in what direction? (c) The bullet is accelerated for 0.007 s. How fast does it leave the barrel of the rifle?

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  1. (a) f = m a = .02/32 * 1E5 = 63 lb

    (b) yes ... Newton's 3rd Law ... equal and opposite reaction

    (c) .007 s * 1E5 ft/s² = 700 ft/s

    sounds like an air rifle

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