I please Angular deceleration

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Homework Help Overview

The discussion revolves around a problem involving angular deceleration of a circular saw blade that completes 1150 revolutions in 42 seconds while coasting to a stop. The participants are tasked with determining the angular deceleration and the initial angular speed, assuming constant deceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relevant equations for angular motion and attempt to connect them to the problem. There is an exploration of how to apply these equations to find angular deceleration and initial speed. Some participants question the integration of different equations to solve for angular acceleration.

Discussion Status

There is an ongoing exploration of relevant equations, with some participants suggesting additional equations that may aid in solving the problem. While attempts have been made to connect the equations, no consensus or final solution has been reached yet.

Contextual Notes

The problem assumes constant deceleration, and participants are working within the constraints of the given information without additional context or data.

bob5445123
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I need help please! Angular deceleration

Homework Statement



A circular saw blade completes 1150 revolutions in 42 s while coasting to a stop after being turned off. Assume constant deceleration.

(a) What is the angular deceleration? (rpm/s)

(b) What is the initial angular speed? (rpm)


Homework Equations



w=wo+at

w^2=wo^2+2a(change in theta)


The Attempt at a Solution


I tried to plug in one equation into the other but it did not work. Any help would be much appreciated.
 
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bob5445123 said:

Homework Statement



A circular saw blade completes 1150 revolutions in 42 s while coasting to a stop after being turned off. Assume constant deceleration.

(a) What is the angular deceleration? (rpm/s)

(b) What is the initial angular speed? (rpm)


Homework Equations



w=wo+at

w^2=wo^2+2a(change in theta)


The Attempt at a Solution


I tried to plug in one equation into the other but it did not work. Any help would be much appreciated.

Welcome to the PF.

There's one more relevant equation that you should add, and it will help you solve part (a). What is the equation for theta as a function of omega and angular acceleration?
 


berkeman said:
Welcome to the PF.

There's one more relevant equation that you should add, and it will help you solve part (a). What is the equation for theta as a function of omega and angular acceleration?

You mean theta=theta intial+wo(t)+1/2at^2?
 


Do you plug in the first equation into the theta equation and solve for a?
 


Alright I think i got it. Thanks for helping
 

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