I got part of this problem (as you\'ll see) but am having a hardtime with the la

Question

I got part of this problem (as you'll see) but am having a hardtime with the last part. A physics tutor can't get iteither...Please help!!!
A uniform disk is rotated about its symmetry axis. The diskgoes from rest to an angular speed of 11 rad/s in a time of 0.20 swith a constant acceleration. The moment of inertia and radius ofthe disk are 1.5 kg*m^2 and 11.5 cm, respectively.

I found the angular acceleration during the 0.20 s interval to be55 rad/s and the net torque during this time to be 83 mN. After theapplied torque stops, a frictional torque remains. This torque hasan associated angular acceleration of 9.8 rad/s^2. Through whattotal angle (starting from time t=0) does the disk rotate beforecoming to rest?
A uniform disk is rotated about its symmetry axis. The diskgoes from rest to an angular speed of 11 rad/s in a time of 0.20 swith a constant acceleration. The moment of inertia and radius ofthe disk are 1.5 kg*m^2 and 11.5 cm, respectively.

I found the angular acceleration during the 0.20 s interval to be55 rad/s and the net torque during this time to be 83 mN. After theapplied torque stops, a frictional torque remains. This torque hasan associated angular acceleration of 9.8 rad/s^2. Through whattotal angle (starting from time t=0) does the disk rotate beforecoming to rest?

Explanation / Answer

= + t 0 = 11 + -9.8 t t = 1.122 seconds = 0 + 0t + 1/2 t2 = 0 + 11*1.122 + 1/2 -9.8 1.1222 = 6.17radians ( 354 degrees)

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