2016 USA Physics Olympiad Exam Part B 8 Part B Question Bl A uniform solid spherical ball starts from rest on a loop-the-loop track.It rolls without slipping along the track.However,it does not have enough speed to make it to the top of the loop.From what height h would the ball need to start in order to land at point P directly underneath the top of the loop?Express your answer in terms of R,the radius of the loop.Assume that the radius of the ball is very small compared to the radius of the loop,and that there are no energy losses due to friction. 2 P Copyright C2016 American Association of Physics Teachers2016 USA Physics Olympiad Exam Part B 8 Part B Question B1 A uniform solid spherical ball starts from rest on a loop-the-loop track. It rolls without slipping along the track. However, it does not have enough speed to make it to the top of the loop. From what height h would the ball need to start in order to land at point P directly underneath the top of the loop? Express your answer in terms of R, the radius of the loop. Assume that the radius of the ball is very small compared to the radius of the loop, and that there are no energy losses due to friction. h R P Copyright c 2016 American Association of Physics Teachers