anonymous
  • anonymous
a bullet of mass 0.04 kg travelling at 300m/s hits a fixed wooden block and penetrates a distance of 4cm.find the average resistance of the wood
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Use the equation v^2=u^2+2as. Here v is zero, u is 300m/s and s is 4cm or 0.04m. Thus a=-300/0.04=-7500m/s^2. Now we can use F=ma to find the resistance, namely F=0.04*(-7500)=-300 N.
anonymous
  • anonymous
Wait i made a mistake. I forgot to do u^2
anonymous
  • anonymous
1/2*m*v^2=F*d 1/2*0.04*300^2=F*0.04 F=45000N

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anonymous
  • anonymous
Yeah, what the pizza guy said
JamesJ
  • JamesJ
For the record, we're constantly discussing questions like this over in the Physics group. Feel free to post more like it over there.

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