A mass (m) is connected to a pulley (rotational inertia I and radius R) which sits atop an incline with angle theta find an expression for angular acceleration in terms of M I R and theta.... incline is frictionless(adsbygoogle = window.adsbygoogle || []).push({});

using T= aI

i get Rmgsin(theta) = aI so a = Rmgsin(theta) over I

but alas this isnt correct and im not sure why

the correct answer has the same numerator but the denominator is I + mR^2 where is the mR^2 coming from? THANKS for any help

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Rotational motion problem help please

**Physics Forums | Science Articles, Homework Help, Discussion**