# Acceleration is the time derivative of velocity. Because velocity...

Introduction: centripetal acceleration

More Details: Acceleration is the time derivative of velocity. Because velocity is a vector, it can change in two ways: the length (magnitude) can change and/or the direction can
change. The latter type of change has a special name, the centripetal acceleration. In this problem we consider a mass moving in a circle of radius R with angular
velocity w, r(t)=R[cos(wt)x + sin(wt)y] = Rcos(wt)x + Rsin(wt)y
What is the velocity of the mass at a time ? You can work this out geometrically with the help of the hints, or by differentiating the expression for given in the
introduction.
Express this velocity in terms of R, w, t, and the unit vectors x and y.
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