問題詳情

6. A solid spherical marble starts from rest and rolls without slipping on theloop-the-loop track in fgure 1. What is the minimum starting height h fromwhich the marble will remain on the track through the loop. Assume themarbles radius is small compared with R.
(A) 2.5R；
(B) 2.7R；
(C)2.9R；
(D) 3.1R；
(E) 3.3R.
 (Note: the moment ofinertial for a solid spherical object is

, where m is the mass of the objectand r is its radius.)Figure 1: Figure for problem 6.Figure 2: Figure for problem 7.

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增

用户評論

【面試倒楣鬼-22幸運上後西】評論

把2/5 mr2 ,當作額外的0.4E ★★★★★★...