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

A cylinder of mass M and radius R rolls(without slipping) down an inclined plane whose incline angle with the horizontal is Θ. Determine the acceleration of the cylinder's venter of mass.(Derive the formula)

2. Relevant equations

I have the answer, but I just don't understand:

∑τ=Iα, use the parallel-axis theorem and a=Rα.

(Mg sin Θ)R=(1/2MR²+MR²)(a/R)

Rg sin Θ=3/2Ra

a=2/3g sinΘ

3. The attempt at a solution

Here's my question. Why do we need to use the parallel-axis theorem? isn't that the torque is just 1/2MR² ? Maybe I am confused with the concept of Torque. I don't know...Please help!!!

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# Acceleration of an object rollling down a incline.

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