A 2.0-kg solid disk rolls without slipping on a horizontal surface so that its center proceeds to the right with speed 5.0 m/s.
The point A is the uppermost point on the disk and the point B is along the horizontal line that connects the center of the disk to the rim.
-What is the direction of the disk's angular velocity?
A)to the left
B)to the right
C)into the paper (away from you)
D)out of the paper (toward you)
E)It varies from point to point on the disk.

Question

A 2.0-kg solid disk rolls without slipping on a horizontal surface so that its center proceeds to the right with speed 5.0 m/s.  
The point A is the uppermost point on the disk and the point B is along the horizontal line that connects the center of the disk to the rim.
-What is the direction of the disk's angular velocity?
A)to the left 
B)to the right 
C)into the paper (away from you) 
D)out of the paper (toward you) 
E)It varies from point to point on the disk.

Quizplus · Accepted Answer

The direction of angular velocity is determined by the right-hand rule. For a disk rotating in a plane, if you curl the fingers of your right hand in the direction of rotation, your thumb points in the direction of the angular velocity vector, which is typically into the paper (away from you) for counterclockwise rotation.

A 20-Kg Solid Disk Rolls Without Slipping on a Horizontal Surface