Homework Help: physics help please!!!

Posted by Anonymous on Thursday, March 25, 2010 at 5:00pm.

What is the angular momentum of a 2.5 kg uniform cylindrical grinding wheel of radius 19 cm when rotating at 1200 rpm? And how much torque is required to stop it in 5.7 s? Need help with step-by-step explanation.

physics help please!!! - bobpursley, Thursday, March 25, 2010 at 5:39pm
chose your moment of Inertia model. I think solid disk is a good model. I= 1/2 mr^2

angMomentum= I*angvelocity

where w (angular velocity)=2PI*1200/60 rad /seconds

Torque=momentinertia*angularacceleration
= 1/2 m r^2 * change in angvelocity/time
= 1/2 m r^2 * (wf-wi)/5.7sec

wf=0 ; wi is 2PI*1200/60 rad/sec

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