[填空题]
How many revolutions per minute would a 15-m-diameter Fe+ux ogjyg l 5tway56/06wbda-rris wheel need todyur- 6b5v3 b+s24p: ttwp3 ojt,egxcz 1r2gj make for the passengers to feel “w jg2+pxv:b ge4y1 ptru32w s3d ,5jb-r6tcztoeightless” at the topmost point? rpm
