Question

What is the direction of the angular velocity vector for the second hand of a clock going from 0 to 30 seconds?

• A. Outward from the clock face
• B. Inward toward the clock face
• C. Upward
• D. Downward
• E. To the right

Answer 1

The correct option is B Inward toward the clock face

Apply the right-hand rule in order to solve this problem. Extend the fingers of right hand upward so that they point to the 0 -second point on the clock face, and then curl them around so that they point downward to the 30 -second point on the clock face. Find that your thumb must be pointing inward toward the clock face. This is the direction of the angular velocity vector.