mehravikas wrote:**S6-6** What is the number of 360-degree rotations that a bicycle wheel made while rolling 100 meters in a straight line without slipping?

(1) The diameter of the bicycle wheel, including the tire, was 0.5 meter.

(2) The wheel made twenty 360-degree rotations per minute.

The number of rotations = total distance/distance traveled in 1 rotation

We know the total distance, so we need to know the distance traveled in one rotation. For a circle, that's merely the circumference.

(1) Gives us diameter, so we can calculate circumference: sufficient.

(2) Gives us rate, which has nothing to do with the size of the circle: insufficient.

(1) is suff, (2) isn't: choose (A).