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

A pulley has a radius of 2.70 m and a moment of inertia of 39.0 kg·m2. There is a hanging mass with a mass of 4.20 kg and it exerts a force tangent to the edge of the pulley. What is the angular acceleration of the pulley in rads/sec^2?

r = 2.7m

I=39kg·m2

m=4.2kg

2. Relevant equations

a = t/I

F = mg

t = Fr

3. The attempt at a solution

I tried finding the torque on the pulley caused by the mass by multiplying the mass * gravity * the radius and then dividing by the moment of inertia to get the angular acceleration but I keep getting 2.8496 which is apparently wrong.

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# Homework Help: Angular acceleration

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