An ultracentrifuge accelerates from rest to 100,000 rpm in 1.70 min. (a) what is its angular acceleration in rad/s2? rad/s2 (b) what is the tangential acceleration of a point 10.55 cm from the axis of rotation? m/s2 (c) what is the radial acceleration of this point at full rpm? m/s2 (d) express this radial acceleration as a multiple of g.

We are given these following data:

ω = 100000rev/min * (2πrad/rev) * (1min/60s) = 10,500 rad/s 
t = 1.7 min = 102 s 

r = 0.1055 m

(a) ω = ωo + at 
10,500 rad/s = 0rad/s + α*102s 
α = 102.94 rad/s² 

(b) a_t = α r = 102.94 rad/s² * 0.1055 m = 10.86 m/s² 

(c) a_r = ω² r = (10500rad/s)² * 0.1055 m = 1.16 x 10^7 m/s² 

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

reserve is the answer