综合题 适中0.65 引用1 组卷498
将一密度比水小的木块,系好绳子后放入甲图容器中,并把绳子的另一端固定在容器底部的中央,然后沿器壁缓慢匀速倒入水(
=1.0×103kg/m3),容器中水与木块位置变化如乙图。木块从加水开始到被完全浸没后的过程中浮力随时间的变化情况图如图丙,(已知木块质量为300g,体积为4×10-4m3,g取10N/kg)
求:(1)0-t1阶段,浮力不断增大,依据是___________
(2)t1-t2内,所受浮力是多少___________ ?
(3)t3-t4时,木块受到的浮力是多少___________ ?以点表示木块,在方框中画出它受力示意图___________ 。
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/12bdc3e7-82f5-4fee-9422-07e1da4f8e59.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/85fc252a-f25f-4639-ad03-9ff3dcbb2c42.png?resizew=295)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/98a3ca3f-59cd-46f1-ae29-b3a2456b049a.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/b2d83f46-cbea-45e2-86c7-cf7dbbb5886a.png?resizew=179)
求:(1)0-t1阶段,浮力不断增大,依据是
(2)t1-t2内,所受浮力是多少
(3)t3-t4时,木块受到的浮力是多少
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/12bdc3e7-82f5-4fee-9422-07e1da4f8e59.png?resizew=90)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/85fc252a-f25f-4639-ad03-9ff3dcbb2c42.png?resizew=295)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/98a3ca3f-59cd-46f1-ae29-b3a2456b049a.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712449955733504/2712986222288896/STEM/b2d83f46-cbea-45e2-86c7-cf7dbbb5886a.png?resizew=179)
2021·广东广州·一模
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