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-rf tqme0 30aosiz83q n an incline that tz9+omr/ w*nwmakes the angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the incline on the 9mzr*/ tnwow +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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