Afigure skater begins spinning counterclockwise at an angular speed of 3.2 π rad/s. during a 4.2 s interval, she slowly pulls her arms
inward and finally spins at 8.8 π rad/s.
what is her average angular acceleration
during this time interval?
answer in units of rad/s^2

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)