an ultracentrifuge accelerates from rest to 100,000 rpm in 2.80 min. (a) what is its angular acceleration in rad/s2? rad/s2 (b) what is the tangential acceleration, in m/s2, of a point 13.05 cm from the axis of rotation? m/s2 (c) what is the radial acceleration, in m/s2, of this point at full rpm? m/s2 (d) express this radial acceleration as a multiple of g.