Problem $3($Figure A$).$ The circular disk in the figure starts rotating from rest at $t=0$ with angular velocity given by: $=3t^2+1ra\frac{d}{s}.$

$($a$)$ What is the angular displacement of the disk at $t=10s$ if $=0$ at $t=0?$

$($b$)$ What is the angular acceleration of the disk at $t=10s?$

Problem $4($Figure A$).$ Using the answers obtained in Problem $3,$ determine the tangential velocity, tangential acceleration and normal acceleration of the point $A.$

Figure A