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Questions  

Suppose a disc is rotating counter clockwise in the plane of the paper then 
 

a
It’s angular velocity vector will be perpendicular to the page pointing up out of the page 
 
b
It’s angular velocity vector will be perpendicular to the page pointing inwards 
 
c
It’s angular velocity vector acts along the tangent to the disc 
 
d
None of the above is correct. 
 

detailed solution

Correct option is A

For clockwise motion of the particle, we can find the direction of ω by right hand rule.
Curls of finger in direction of motion and thumb will give direction of ω
∴ direction of ω is perpendicular inside plane of paper.

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