本题目来源于试卷: Physics Unit9: Static Equilibrium, Elasticity and Fracture，类别为 通用国际物理
[单选题]
A heavy boy and a light girl are balanced iw9 .,5l1+uw-(d xid on-i ui;pdwfzpon a massless seesaw. If thezq9uarw y z5) qq+;:f0o.) y uhpfkc6ly both move forward so that thezqp ucwrkq:0a fy9+yhf6q;ol) u)z5. y are one-half their original distance from the pivot point, what will happen to the seesaw?
A. The side the boy is sitting on will tilt downward.
B. The side the girl is sitting on will tilt downward.
C. Nothing, the seesaw will still be balanced.
D. It is impossible to say without knowing the masses and the distances.
参考答案: A
本题详细解析:
暂无
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