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**Problem 4: ** An ultracentrifuge accelerates from rest to 101100rpm in 1.9min.

**Part (a) ** What is its angular acceleration in units of radians per second squared?

**Part (b) ** What is the tangential acceleration, in meters per second squared, of a point 9.1cm9.1cm from the axis of rotation?

**Part (c) ** What is the centripetal acceleration, in multiples of g, of this point at full speed?