In a rifle barrel, a 19.5 g bullet is accelerated from rest toa speed of 720m/s

Question

In a rifle barrel, a 19.5 g bullet is accelerated from rest toa speed of 720m/s 1. Find the work that is done on the bullet in kJ? 2. If the rifle barrel is 73.5 cm long, find the magnitude ofthe average total force that acted on it? in kN 3. Find the constant acceleration of a bullet that starts fromrest and gains a speed of 720m/s over a distance of 73.5 cm? inkm/s 4. If the bullet has a mass of 19.5 find the total force thatacted on it as F=ma in kN In a rifle barrel, a 19.5 g bullet is accelerated from rest toa speed of 720m/s 1. Find the work that is done on the bullet in kJ? 2. If the rifle barrel is 73.5 cm long, find the magnitude ofthe average total force that acted on it? in kN 3. Find the constant acceleration of a bullet that starts fromrest and gains a speed of 720m/s over a distance of 73.5 cm? inkm/s 4. If the bullet has a mass of 19.5 find the total force thatacted on it as F=ma in kN

Explanation / Answer

1) work done = change in KE = (1/2)mv2 =.5(.0195)(7202) N >>> compute this 2) work done = (avg force)(distance) avg force = (work)/.735) compute this (you already know the work from part (1)). thendivide by 1000 to get the answer in kN. 3) acceleration = force/(.0195) >>> compute using thevalue of force in part (2) 4) same as in part (2). hope this helps!

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