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Created for Albert.io. Copyright 2016. All rights reserved.
A disk lying the $x-y$ plane is spinning, as shown in the figure above.
What is the direction of the angular velocity of the disk?
Along the $+y$-axis.
Along the $+x$-axis.
Along the $+z$-axis.
Along the $–z$-axis.
$45^\circ$ to the $x$-axis in the first quadrant.