(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The torsion spring at A applies the counterclockwise couple C(θ)= − 10θ N · m to the uniform bar.The angle θ (in radians) is measured counterclockwise

from position 1, where the spring is undeformed.

Calculate the work done by the spring on the bar as it rotates from position 2 to position 3.

http://img849.imageshack.us/img849/1696/182z.jpg [Broken]

2. Relevant equations

U_{1-2}= ∫C dθ

U_{1-2}= C(θ2 − θ1)= C Δθ

3. The attempt at a solution

U_{1-2}= ∫− 10θ dθ = -10∫θ dθ

= -10 (1/2) θ^{2}

50° = 5π/18 rad

U_{1-2}= -3.8

I am not sure if that is the correct way of solving it, any guidance would be helpful

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# Homework Help: Work done by spring

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