本题目来源于试卷: Physics Unit10: Fluids Related Topics，类别为 通用国际物理
[单选题]
When a small spherical rock of;jyiwlg6*z; z radius r falls 6*3sq(szpu 6f9 l8g5f9k vo;ursljge 7o;d yzthrough water, it experiences a drag forq g ;lk8sseul 5yd6* ; 6fouovr (fzj3g7zp99sce $F=arv$, where $v$ is its velocity and $a$ is a constant proportional to the viscosity of water. From this, one can deduce that if a rock of diameter 2.0 mm falls with terminal velocity, $v$, then a rock of diameter 4.0 mm will fall with terminal velocity .
A. $v$
B. $1.4 \; v$
C. $2.0 \; v$
D. $4.0 \; v$
参考答案: D
本题详细解析:
暂无
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