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]
When a block of wood with a wo(2wn( os tim,i0gs,feig2zeu49. li ay;0i ba;wbgjkh*ht of $30 \mathrm{~N}$ is completely submerged under water the buoyant force on the block of wood from the water is $50 \mathrm{~N}$. When the block is released it floats at the
surface. What fraction of the block will then be visible above the surface of the water when the block is floating?
A. $1 / 15$
B. $1 / 5$
C. $1 / 3$
D. $2 / 5$
E. $3 / 5$
参考答案: A
本题详细解析:
暂无
| 
