本题目来源于试卷: Typical Forces，类别为 美国物理杯赛(Physics Bowl)
[单选题]
07.09: A block rests o-y2d0p ,et pzp0fx )don an incline that3 x9) mpxqd5wt makes the angle θ with the horizontal. The blox)m3 p dqwtx95ck remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the incline on the block
A. both increase.
B. both decrease.
C. both remain the same
D. increase and decrease, respectively
E. decrease and increase, respectively.
参考答案: E
本题详细解析:
暂无
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