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 bottom of fqhj6 5keig:(a bucket. The bucket is z34 o3kqbvh0e8orgg(hc3yq. j51hnp spun in a vertical circle of radius L by a rope. When the bucket reaches the highest point in its motion, it moves just fast enough for the block to rema 4q 3 10o3ohhhkn .z3byv gejqrp(8 g5cin 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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