A wheel 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