A stroboscope is a light that flashes on and off at a constant rate. It can be used to illuminate a rotating object, and if the flashing rate is
adjusted properly, the object can be made to appear stationary. A three-bladed fan appears stationary when the flashing rate is increased
to 25 times per second. What is the angular velocity of the blades?
O A. 25.0 rev./s
OB. 0.33 rev./s
O C. 8.33 rev./s
O D. 16.5 rev./s
OE. 4.50 rev./s