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]
An object of mass m is hanging by a string from th24p ;qgirgh;beyxa(d(i d8 a.e ceiling of an 9+q.ahps+rrpe7uzy gd3 /l cca8fd 8sh:me 8( elevator. The elevator is moving upas chy7slrac/+ .mg +8 zd :h dpe3e8pru(qf98 at constant speed. What is the tension in the string?
A. less than mg
B. exactly mg
C. greater than mg
D. cannot be determined without knowing the speed
参考答案: B
本题详细解析:
暂无
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