问题 实验题

小强用测力计等器材测量一块石灰石的密度,请将下面实验步骤中的数据补充完整。(g=10N/kg)

(1)如图甲所示,用测力计测出该石灰石在空气中的重力G="2.5" N;

(2)将该石灰石浸没在水中静止时,如图乙所示,测力计的示数F="_______" N;

(3)根据阿基米德原理可算出该石灰石的体积V="___________" m3

(4)根据密度公式算出该石灰石的密度ρ= ___________kg/m3

答案

(2)1.5(2分);(3)1.0×10-4(3分);(4)2.5×103(3分)。

(2)通过读取图乙中测力计的示数,得出测力计的示数为1.5N,因为测力计的每个最小格是0.1N;(3)故石灰石受到的浮力为F=G-F=2.5N-1.5N=1.0N,再由阿基米德原理可得,石灰石的体积就是排开的水的体积V==1.0×10-4m3;(4)由重力可计算出石灰石的质量,再由密度公式即可计算出石灰石的密度ρ==2.5×103 kg/m3

完形填空
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问答题 简答题