本题目来源于试卷: Physics Unit5: Circular Motion & Gravitation，类别为 国际高中通用物理
[单选题]
A roller coaster car is on a track that fc kexuj ph+-a9;l9fd; y3hgb+orms a circular loox8- k p 78inghf:xj*/;t yipyjp in the vertical plane. If thehnii /yp x8:x *gf;ytpk7 jj8- car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A. g downward
B. 0.5g downward
C. g upward
D. 2g upward
参考答案: A
本题详细解析:
暂无
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