Posted by **Mary** on Tuesday, April 24, 2007 at 7:01pm.

An electric clock is hanging on the wall in the living room. The clock is unplugged, and the second hand comes to a halt over a brief period of time. During this period, what is the direction of the angular acceleration of the second hand?

a. clockwise

b. counterclockwise

Why?

I choose clockwise but I am not sure why. Please help!

angular acceleration= wf-wi/time

Notice that wf is zero, so if clockwise is positive, then angular acceleration is the negative of that.

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