本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
17.38: A small 2.0 kg block rests at the bot c ta85k9evw o41vdft8 wwpr5,tom o eqwa. d4c l*w;v,-jht f a bucket. The bucket is spun in a vertical circle of radius L by a rope. When the bucket reaches the h *w w;j lh,t4dc -.evaqighest point in its motion, it moves just fast enough for the block to remain in place in the bucket. When the bucket is at an angle $θ=30^{\circ}$from the vertical, as seen in the figure, what is the magnitude of the normal force (perpendicular to the surface) provided by the bucket onto the block? Note that the direction of the gravitational field is indicated in the diagram by  and that the block does not touch any sides of the bucket aside from the bottom of it.
A. 8.0N
B. 10.0N
C. 15.4N
D. 18.7N
E. 37.3N
参考答案: A
本题详细解析:
暂无
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