浮力f。浮動的= G-F = 12N-5N = 7N;
根據阿基米德原理f
浮力f。浮動的大於物體的重力g,所以物體壹直浮到浮起來,
此時物體的浮力:f < span class = " math zyb " mathtag = " math " style = " white space:nowrap;字間距:正常;word wrap:normal " & gt;& lt表格cellspacing="0" cellpadding="0 " >& lttr & gt& lttd & gt& lt/TD & gt;& ltTD style = " line-height:normal;左填充:1px;font-size:90% " & gt;& ltdiv math tag = " msub sup _ sup " hassize = "-1 " >''& ltdiv mathtag = " msubsup _ sub " & gt浮動的& lt/tr & gt;& lt/table & gt;& lt/span>。=G=12N。
因此,選擇:d。