本题目来源于试卷: Physics Unit4: Force Dynamics & Newton's Laws，类别为 通用国际物理
[单选题]
A child's toy is susp) 5anen(wxu7hl2keh0qzxp a w8.f;2qended frju(mx y-8oc j)om the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the -(mc)y8 oujjx "action force," what is the "reaction force"?
A. The string pulling upward on the toy with an 8.0-N force.
B. The ceiling pulling upward on the string with an 8.0-N force.
C. The string pulling downward on the ceiling with an 8.0-N force.
D. The toy pulling upward on the Earth with an 8.0-N force.
参考答案: D
本题详细解析:
暂无
| 
