A rifle with a barrel length of 70 cm firesa 10 g bullet with a horizontal speed

Question

A rifle with a barrel length of 70 cm firesa 10 g bullet with a horizontal speed of 500 m/s.The bullet strikes a block of wood and penetrates to a depthof 20 cm. a)What resistive force (assumed to be constant) does the woodexert on the bullet? b)How long does it take the bullet to come to rest? A rifle with a barrel length of 70 cm firesa 10 g bullet with a horizontal speed of 500 m/s.The bullet strikes a block of wood and penetrates to a depthof 20 cm. a)What resistive force (assumed to be constant) does the woodexert on the bullet? b)How long does it take the bullet to come to rest?

Explanation / Answer

(a) resistive force (assumed to be constant) the wood exert onthe bullet: so we can also assumed that acceleration of the bullet isconstant =a 2*20cm*a=5002 F=a*m =6250 N (b)the time requied: v=500-a*t v=0=>t=8*10-4 s (b)the time requied: v=500-a*t v=0=>t=8*10-4 s

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