An insect trapped in a circular groove of radius 12 cm moves along the groove steadily and completes 7 revolutions in 100 s. What is the angular speed of the motion? 

1.  0.62 rad/s

2.  0.06 rad/s

3.  4.40 rad/s

4.  0.44 rad/s

An insect trapped in a circular groove of radius 12 cm moves along the groove steadily and completes 7 revolutions in 100 s. Is the acceleration vector a constant vector? What is its magnitude?

1.  yes, 2.3 $\mathrm{cm}/{\mathrm{s}}^2$

2.  no, 5.3 $\mathrm{cm}/{\mathrm{s}}^2$

3.  yes, 5.3 $\mathrm{cm}/{\mathrm{s}}^2$

4.  no, 2.3 $\mathrm{cm}/{\mathrm{s}}^2$