Awheel on a watermill turns halfway every 4.0 s. what is the wheel's angular velocity? a. 0.39 rad/s b. 2.5 rad/s c. 3.1 rad/s d. 0.79 rad/s e. 13 rad/s

A revolution equals 2*pi radians.
 As the wheel rotates half every 4 seconds, then it means that it rotates half revolution.
 Thus, the angular velocity of the wheel is given by:
 w = (pi) / (4) = 0.79 rad / sec
 answer
 The wheel's angular velocity is 0.79 rad / sec

The third hammer 8 pounds