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Steelers72
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Homework Statement
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 ?
Homework Equations
[/B]
(v*v)/r
Pythagorean theorem
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?