Monday
November 24, 2014

Homework Help: Physics

Posted by Emily on Friday, July 30, 2010 at 3:36pm.

I have two questions, both are about angular momentum so I thought I'd post them together. I'm really confused on anything regarding rolling wheels and things like that (help me please!. It seems as though the whole chapter was amassed of all of the topics I cant wrap my head around. For both of these, the only work I have down is angular momentum l=rXp, or m(rXv), or =rmvsintheta. Any help would be so great and much appreciated. Thanks so much in advance!


1. A particle is acted on by two torques about the origin: τ1 has a magnitude of 4.5 Nm and is directed in the positive direction of the x axis, and τ2 has a magnitude of 1.4 Nm and is directed in the negative direction of the y axis. What are the magnitude and direction of d/dt, where is the angular momentum of the particle about the origin?


2. A sanding disk with rotational inertia 1.3 10-3 kgm2 is attached to an electric drill whose motor delivers a torque of 9 Nm about the central axis of the disk. What are the following values about the central axis at the instant the torque has been applied for 140 ms?
(a) the angular momentum of the disk
in kgm2/s

(b) the angular speed of the disk
in rad/s

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