I please Angular deceleration

[bob5445123]

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.

 

[berkeman]

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?

 

[bob5445123]

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?

 

[bob5445123]

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

 

[bob5445123]

Alright I think i got it. Thanks for helping