text: # Bullet in block of wood.
  
  by TylerK
  Tags: block, bullet, wood
   P: 4 1. The problem statement, all variables and given/known data A rifle with a barrel length of 56 cm fires a 10 g bullet with a horizontal speed of 350 m/s. The bullet strikes a block of wood locked in position and penetrates to a depth of 13 cm. What resistive force (assumed to be constant) does the wood exert on the bullet? How long does it take the bullet to come to rest? 2. Relevant equations f = m * a d = v * t vf = vi + a * t 3. The attempt at a solution Force of wood on bullet = 4700 (was confirmed correct) f = m * a a = -471154 N How long does it take the bullet to come to rest? I tried D = v * t1 for the barrel .55 = 350 * t1 t1 = 350 / .55 = .0016 seconds For the wood vf = vi + a * t2 0 = 350 - 471154 t2 t2 = 350 / 471154 = .000743 seconds t1 + t2 = .002343 seconds which is wrong.
  P: 21,728
  If the barrel was twice longer, would it change time needed to stop the bullet?
  
  You wrote
  
   Quote by TylerK a = -471154 N
  Are you sure N is a correct unit of acceleration?
   P: 4 Yes it is m/s^2 I mistakenly typed N. I tried to brake the problem up into 2 parts. Part 1: Time of bullet in barrel, with 0 acceleration so d = v * t .56m = 350 m / s * t t = .56 m * s / 350 m = .0016 seconds Part 2: Time it enters the wood until the bullet stops. vf =vi + a * t 0 = 350 m/s + (-471154 m / s^2) t [U] -350 m/s * (1/-471154 m/s^2) = t t = .000743 seconds I apparently do not add these 2 times together, as the combined result is incorrect. If the barrel was twice as long, wouldn't it double the amount of time the bullet was in the barrel, as accounted for in the first part? (assuming no friction in the barrel)
explanation: The document is a discussion thread from a physics forum where a user named TylerK is asking for help with a physics problem involving a bullet fired from a rifle and its interaction with a block of wood. The user provides the problem statement, relevant equations, and their attempt at a solution. Another user responds with a hint and a correction regarding units. TylerK then clarifies their solution and reiterates their question about the time it takes for the bullet to come to rest.
  
  The document contains a question and an attempt at an answer, but the answer is not complete or correct.
distilabel_metadata.content: Evaluate the user given text extract and determine if it contains a math question and optionally and answer to this question.
  
  Output rules:
  
  1. Briefly describe the document and mention if it contains a question or a question and answer.
  2. Finalize the output with: Label: no-question,question,question-and-answer,multiple-question,multiple-question-and-answer
distilabel_metadata.role: system
distilabel_metadata.content: # Bullet in block of wood.
  
  by TylerK
  Tags: block, bullet, wood
   P: 4 1. The problem statement, all variables and given/known data A rifle with a barrel length of 56 cm fires a 10 g bullet with a horizontal speed of 350 m/s. The bullet strikes a block of wood locked in position and penetrates to a depth of 13 cm. What resistive force (assumed to be constant) does the wood exert on the bullet? How long does it take the bullet to come to rest? 2. Relevant equations f = m * a d = v * t vf = vi + a * t 3. The attempt at a solution Force of wood on bullet = 4700 (was confirmed correct) f = m * a a = -471154 N How long does it take the bullet to come to rest? I tried D = v * t1 for the barrel .55 = 350 * t1 t1 = 350 / .55 = .0016 seconds For the wood vf = vi + a * t2 0 = 350 - 471154 t2 t2 = 350 / 471154 = .000743 seconds t1 + t2 = .002343 seconds which is wrong.
  P: 21,728
  If the barrel was twice longer, would it change time needed to stop the bullet?
  
  You wrote
  
   Quote by TylerK a = -471154 N
  Are you sure N is a correct unit of acceleration?
   P: 4 Yes it is m/s^2 I mistakenly typed N. I tried to brake the problem up into 2 parts. Part 1: Time of bullet in barrel, with 0 acceleration so d = v * t .56m = 350 m / s * t t = .56 m * s / 350 m = .0016 seconds Part 2: Time it enters the wood until the bullet stops. vf =vi + a * t 0 = 350 m/s + (-471154 m / s^2) t [U] -350 m/s * (1/-471154 m/s^2) = t t = .000743 seconds I apparently do not add these 2 times together, as the combined result is incorrect. If the barrel was twice as long, wouldn't it double the amount of time the bullet was in the barrel, as accounted for in the first part? (assuming no friction in the barrel)
distilabel_metadata.role: user
distilabel_metadata.raw_output_q_a_detector_0: The document is a discussion thread from a physics forum where a user named TylerK is asking for help with a physics problem involving a bullet fired from a rifle and its interaction with a block of wood. The user provides the problem statement, relevant equations, and their attempt at a solution. Another user responds with a hint and a correction regarding units. TylerK then clarifies their solution and reiterates their question about the time it takes for the bullet to come to rest.
  
  The document contains a question and an attempt at an answer, but the answer is not complete or correct.
  
  Label: question-and-answer