Bullet hitting stationary Target.

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Homework Help Overview

The discussion revolves around a physics problem involving a bullet penetrating a stationary target, focusing on concepts of acceleration, distance, and the direction of forces involved. The subject area includes kinematics and dynamics.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the calculation of acceleration and distance, questioning the direction of acceleration in relation to the bullet's motion. There are inquiries about whether the bullet slows down or speeds up as it penetrates the target.

Discussion Status

Participants are actively engaging with each other's reasoning, exploring the implications of acceleration being negative and its effect on the calculations. Some guidance has been offered regarding the direction of acceleration, but there is no explicit consensus on the correctness of the original calculations.

Contextual Notes

There is a focus on the assumptions regarding the direction of acceleration and its impact on the final answer, with some participants noting the need to reconsider calculations based on these assumptions.

Adarshaero
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A bullet of 0.005 kg traveling at 20m/s penetrates deeply into a fixed target and is brought to rest in 0.01 sec. The distace through which it penetrates is:

I used,

acceleration= V/t
= 20/.01
a = 2000 m/sec sq

Distace covered = Ut+0.5 at^2
= 20*0.01+0.5*2000*(o.o1)^2
S= 30cm.

Is it correct or any other solution is possible..?
 
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The initial speed and the acceleration have opposite directions.
 
@willem2:

How is tat? can you please elaborate.
 
Does the bullet slow down or speed up as it moves through the block? So is acceleration positive or negative?
 
Acceleration reduces as the bullet enters the target.
 
so acceleration is negative...
 
Adarshaero said:
so acceleration is negative...

The velocity reduces as it passes through the target. So yes, acceleration is negative (in the direction opposite to the velocity).
 
I understand ur point. So is the approach right? And how about answer?
 
The approach is fine. How about the answer? Have you calculated one with the new knowledge about the acceleration direction?
 

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