Question

A mass is revolving in a circle which is in the plane of the paper. The direction of angular acceleration is.....​

Answer 1

Explanation:

If the increase in angular velocity appears clockwise with respect to an observer, then the angular acceleration vector points away from the observer. As in this case, mass is revolving in a circle that lies on the plane of a paper so angular acceleration will be perpendicular to the plane of paper along the axis.

Answer 2

Answer:

Well, the direction of angular acceleration depends on the orientation of rotation of the mass in the plane of the paper too.

For example, if it is rotating clockwise as seen from top in the plane of the paper, then by the right hand thumb rule, the direction of angular Acceleration will be into the paper away from you and vice versa for mass rotating In anticlockwise direction as seen from top will be out of the paper towards you.

hope this helps you !