- #1

Esoremada

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## Homework Statement

http://puu.sh/5Qrxt.jpg [Broken]

## Homework Equations

τ = dL/dt

## The Attempt at a Solution

I understand the initial and final angular momentum vectors in the diagram, and the answer seems to make sense.

But when I initially solved it my logic was that since the axle itself is rotating clockwise, then the torque vector causing that would point into the page due to the right hand rule - why is this reasoning wrong?

To be honest I've never used τ = dL/dt before, it's on our formula sheet but I don't remember learning it

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