本题目来源于试卷: Overweight and underweight，类别为 美国物理杯赛(Physics Bowl)
[单选题]
03.07: A 2 kg mass and a ,e 5dglk p(fg6 4 kg mass on a horiz /h- z.+ s)oqig:rhsw3n5x ng(v ik*uyontal frictionless surface are connected by a massless string A. They are pulled horizontally across the surfac ink3/n+s r:h q zh5ggyxv-)oi.us *w(e by a second string B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string A on the 4 kg mass?
A. 72N
B. 48N
C. 24N
D. 6N
E. 3N
参考答案: B
本题详细解析:
暂无
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