Q 26

A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 m/s to rest over a distance of 115 m.What is the magnitude of its angular acceleration if there was no slipping?
A)1.8 rad/s^{2}
B)0.90 rad/s^{2}
C)5.7 rad/s^{2}
D)11 rad/s^{2}

Q 27

A child is riding a merry-go-round that has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745 rad/s^{2}.The child is standing 4.65 m from the center of the merry-go-round.What is the magnitude of the linear acceleration of the child?
A)8.05 m/s^{2}
B)7.27 m/s^{2}
C)2.58 m/s^{2}
D)3.46 m/s^{2}
E)4.10 m/s^{2}

Q 28

How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s^{2}?
A)4.35 s
B)5.30 s
C)9.57 s
D)10.6 s
E)63.1 s