An electric ceiling fan is rotating about a fixed axis with an initial velocity magnitude of $0\mathrm{.}230$ rev$/$s$.$ The magnitude of the angular acceleration is $0\mathrm{.}917$ rev$/$s$^2.$ Both the angular acceleration and angular velocity are directed counter clockwise. The electric ceiling fan blades form a circle of diameter $0\mathrm{.}760$m$.$ Calculate the magnitude of the centripetal acceleration of the point at the end of the fan blade.