An astronaut is being tested in a centrifuge. The centrifuge has a radius of 7.6 m and, in starting, rotates according to θ = 0.17t2, where t is in seconds and θ is in radians. When t = 4.2 s, what are the magnitudes of the astronaut’s
a) angular velocity
b) linear velocity
c) tangential acceleration
d) radial acceleration?