Calculating Bullet Speed: Pendulum Physics Homework Problem Solution

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Homework Help Overview

The problem involves calculating the speed of a bullet based on the displacement caused when the bullet lodges into a log, utilizing principles of pendulum physics. The original poster has horizontal displacement, the weight of the log, and the length of the string but is uncertain about the equations needed to proceed.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between kinetic energy and potential energy, suggesting that the kinetic energy of the bullet converts into the potential energy of the log's displacement. The original poster expresses uncertainty about how to set up the problem and which equations to use.

Discussion Status

Some guidance has been provided regarding the energy relationship, but the original poster initially struggled with the setup. The original poster later indicates they figured out the problem, suggesting some progress was made in understanding the concepts involved.

Contextual Notes

The original poster has not specified all the necessary details for a complete analysis, such as the angle of displacement or specific values for mass and height, which may affect the calculations.

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Homework Statement


I have to calculate the speed of a bullet, based on the amount of displacement created when the bullet becomes lodged in the log.
I have the horizontal displacement, the weight of the log, and the length of the string.


Homework Equations


I'm not sure how to set this up so I don't know what equations to use yet.


The Attempt at a Solution


I calculated the horizontal displacement and have enough information to finish the problem, but I'm not sure which equations to use. Any start is appreciated, thanks.
 
Physics news on Phys.org
KE = PE

The ½mV² of the bullet becomes the mgh of the log displacement.

You know L and θ apparently so ...
 
I just figured it out. Thanks for the response though
 
Just for future reference, this page helps a lot in pendulum problems
http://www.rowan.edu/colleges/lasold/PhysicsAndAstronomy/LabManual/labs/EnergyInAPendulum.pdf
 
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