As shown in the figure, a bar is welded to a vertical hoop of diameter 0.50 m between points A and B located on the rim. B is the lowest point of the rim. The bar makes an angle θ with the line joining the center of the hoop O and B. A small box placed on A can slide from rest on this frictionless bar. Determine the time required for the box to slide from point A to point B.

• A. 0.32 s
• B. [0.32 cos (θ)] s
• C. 0.25 s
• D. [0.25 sin (θ)] s

Answer: (A)