研究所、轉學考(插大)◆普通物理學題庫下載題庫

1. Consider a block sliding on a frictionless loop-the-loop track of radius R shown in the figure. Find the minimum height H at which the block starts from rest and still contacts the track when it passes the highest point of the track (point A).

(A) 0.5 R
(B) R
(C) 1.5 R
(D) 2 R
(E) 2.5 R