What is the recoil speed of the rifle?

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Homework Help Overview

The problem involves calculating the recoil speed of a rifle after firing a bullet, focusing on the principles of momentum conservation. The subject area is physics, specifically relating to mechanics and momentum.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the application of the momentum equation, with attempts to calculate the recoil speed based on given values. Questions arise regarding unit conversions and arithmetic accuracy.

Discussion Status

The discussion is ongoing, with participants providing feedback on calculations and clarifying unit conversions. Some guidance has been offered regarding the correct interpretation of the mass of the bullet and its impact on the calculations.

Contextual Notes

There are noted discrepancies in unit conversions and arithmetic, which participants are addressing. The original poster acknowledges errors and seeks confirmation on their understanding of the momentum equation.

jazzysoshort
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Homework Statement


Kim holds a 2.0 kg air rifle loosely and fires a bullet of a mass 1.0 g. The muzzle velocity of the bullet is 150 m/s. What is the recoil speed of the rifle?


Homework Equations


p=mv


The Attempt at a Solution


p=(150)(.01) 15=2v
p=15 7.5=v
 
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Looks correct. Just note that it is -7.5m/s
 


No, it is not OK. 1.0g is not 0.01kg.

Even assuming it is, 150*0.01 is not 15.
 


I apologize wasn't what i had on my paper in a bit of rush to see if i was understanding the equation. You are absolutely right 1 g is .001kg and it multiplied by 150 is 1.5, but besides careless errors i just want 2 know am i on the right track
 


General approach seems to be OK :smile:
 

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