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 on an incline that makexxmi4atl4*-o/xvd +dnj2 l9q . otw h0pwx-n:s +x-oks the angle θ with the horizontal. The block remains at rest as θ is slowly i0oh -s.+ wp wxn-kxto:ncreased. 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
| 
