本题目来源于试卷: 2011 美国F=ma物理竞赛 F=ma physics competition，类别为 美国物理杯赛(Physics Bowl)
[单选题]
A block of mass $m=3.0 \mathrm{~kg}$ slides down one ramp, and then up a second ramp. The coefficient of kinetic friction between the block and each ramp is $\mu_{\mathrm{k}}=0.40$. The block begins at a height $\mathrm{h}_{1}=1.0 \mathrm{~m}$ above the horizontal. Both ramps are at a $30^{\circ}$ incline above the horizontal. To what height above the horizontal does the block rise on the second ramp?
A. $0.18 \mathrm{~m}$
B. $0.52 \mathrm{~m}$
C. $0.59 \mathrm{~m}$
D. $0.69 \mathrm{~m}$
E. $0.71 \mathrm{~m}$
参考答案: A
本题详细解析:
暂无
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