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April 18, 2015

April 18, 2015

Posted by **Papito** on Monday, May 7, 2007 at 1:18pm.

(a) What is the net torque produced by the two forces? (Assume counterclockwise is the positive direction

(b) What is the angular acceleration of the disk?

This is how i solved it.

Torque = Fl

net torque = (125N x 0.454m) + (90N x 0.454N)=97.81

Angular acceleration = torque/ inertia

Inertia = mass x radius ^2

= 40.3 kg x 0.454 ^2 =8.31

Angular acceleration = 97.81/ 8.31 =11.77 rads/s^2

Please check solution

Isnt the moment of inertia 1/2 m r^2 ?

So Moment of Inertia = 0.5x 40.3kg x 0.454^2 = 4.15

Angular acceleration =97.81/4.15

=23.55

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