Elevator + Counterweight problem

[rpike]

Homework Statement

The problem is as posted in this picture[/B]

Hey guys/girls, my teacher gave us this problem which I am not sure if I have correct. Could someone please verify if my solution is correct.

Homework Equations

As in my attempt

The Attempt at a Solution

My attempt is scanned -

 

[ehild]

Welcome to PF!

Your solution is correct, but you save time both for yourself and for the helpers if you do the solution symbolically, and plug in the data at the end. You would see that the radius of the rotor cancels.

 

[rpike]

Welcome to PF!

Your solution is correct, but you save time both for yourself and for the helpers if you do the solution symbolically, and plug in the data at the end. You would see that the radius of the rotor cancels.

Thanks!
Ok, I will do it symbolically next time