Newton’s law of motion (id: d241dafea)

本题目来源于试卷: Newton’s law of motion，类别为 美国物理杯赛(Physics Bowl)

[单选题]
02.40: A box with a un-z:n /hsv28 mw,rhzmaszc (nahbi bz0s7/ 0pr0vh6pr; s of 50 kg is dragged across the floor by a rope which makes an angle of 300 with the horizontal. Which of the following would be closest to the coefficient of 6az(/; p rz isv007b bn0pchhrkinetic friction between the box and the floor if a 250 newton force on the rope is required to move the crate at a constant speed of 20 m/s as shown in the diagram?

A. 0.26
B. 0.33
C. 0.44
D. 0.56
E. 0.77


参考答案:  D


本题详细解析: 暂无

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