A sanding disk with rotational inertia 1.2E-3 kg m^2 is attached to an electric drill whose motor delivers a torque of magnitude 16 N m about the central axis of the disk. About that axis, and with the torque applied for 33 ms,(adsbygoogle = window.adsbygoogle || []).push({});

(a) What is the magnitude of the angular momentum of the disk?

I have τ= 16 N m and t= 0.033 s

I= 1.2e-3 kg m^2

In my book first of all there are two equations given for angular momentum (L)

Those are L= Iw and L=rp and I'm not sure which one I'm suppose to use. I have I but not w and I don't have r or p and p=mv correct? So I feel like this is actually a lot easier than I'm making it out to be but I can't get it. Any help will be greatly appreciated.

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# Homework Help: Angular momentum sanding disk

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