1. The problem statement, all variables and given/known data An electric ceiling fan is rotating about a fixed axis with an initial angular velocity magnitude of 0.270rev/s . The magnitude of the angular acceleration is 0.902rev/s2 . Both the the angular velocity and angular accleration are directed clockwise. The electric ceiling fan blades form a circle of diameter 0.800m . What is the magnitude a of the resultant acceleration of a point on the tip of the blade at time t= 0.191s ? 2. Relevant equations (v*v)/r Pythagorean theorem 3. The attempt at a solution Tangential acceleration= angular acceleration*radius =.902*.400 =.361 centripetal acceleration = (v*v)/r I calculated v (tangential velocity) to be 1.11 ---which is correct based on answer key = (1.11^2)/.400 =3.08 sqrt( (3.08^2)+(.361^2) ) =3.10 However, this apparently is incorrect. What am I doing wrong?