Posted by Jordan on Sunday, October 24, 2010 at 12:16pm.
An electric drill starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration of a point on the drill is twice the magnitude of the tangential acceleration. What is the angle?

physics  drwls, Sunday, October 24, 2010 at 12:38pm
w = a*t where a is the angular acceleration, in rad/s^2, and t is the time since it started to accelerate
R w^2 = R*(a*t)^2 = 2 R*a
R cancels out. a^2* t^2 = 2a
t = sqrt (2/a)
I cannot provide a numerical value without knowing the acceleration rate.
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